Knowledge

Lux

Source 📝

2567: 503:(maintaining the same distance), the illuminated spot becomes larger and so is less highly illuminated. When a surface is tilted at an angle to a source, the illumination provided on the surface is reduced because the tilted surface subtends a smaller solid angle from the source, and therefore it receives less light. For a point source, the illumination on the tilted surface is reduced by a factor equal to the cosine of the angle between a ray coming from the source and the 2541: 524:" unit. The difference between any photometric unit and its corresponding radiometric unit is that radiometric units are based on physical power, with all wavelengths being weighted equally, while photometric units take into account the fact that the human eye's image-forming visual system is more sensitive to some wavelengths than others, and accordingly every wavelength is given a different weight. The weighting factor is known as the 2579: 38: 258:) as a measure of the total "amount" of visible light present, and the illuminance as a measure of the intensity of illumination on a surface. A given amount of light will illuminate a surface more dimly if it is spread over a larger area, so illuminance is inversely proportional to area when the luminous flux is held constant. 557:
For a light source with mixed wavelengths, the number of lumens per watt can be calculated by means of the luminosity function. In order to appear reasonably "white", a light source cannot consist solely of the green light to which the eye's image-forming visual photoreceptors are most sensitive, but
472:
0 provides 2.08 microlux (ÎŒlx) at the Earth's surface. A barely perceptible magnitude 6 star provides 8 nanolux (nlx). The unobscured Sun provides an illumination of up to 100 kilolux (klx) on the Earth's surface, the exact value depending on time of year and atmospheric conditions. This direct
645:
is a measure of the illuminance of a star on the Earth's atmosphere. A star with apparent magnitude 0 is 2.54 microlux outside the earth's atmosphere, and 82% of that (2.08 microlux) under clear skies. A magnitude 6 star (just barely visible under good conditions) would be 8.3 nanolux. A standard
507:
to the surface. In practical lighting problems, given information on the way light is emitted from each source and the distance and geometry of the lighted area, a numerical calculation can be made of the illumination on a surface by adding the contributions of every point on every light source.
502:
The illuminance on a surface depends on how the surface is tilted with respect to the source. For example, a pocket flashlight aimed at a wall will produce a given level of illumination if aimed perpendicular to the wall, but if the flashlight is aimed at increasing angles to the perpendicular
2128:(nx). Die Umrechnungsfaktoren zwischen den Hell- und DunkelgrĂ¶ĂŸen hĂ€ngen von der spektralen Zusammensetzung des Lichtes ab. Sie werden deshalb fĂŒr die Farbtemperatur 2042 K (frĂŒher 2360 K) festgelegt. Bei dieser ist 1 sk = 10 asb und 1 nx = 10 lx. 624:. One foot candle is about 10.764 lx. Since one foot-candle is the illuminance cast on a surface by a one-candela source one foot away, a lux could be thought of as a "metre-candle", although this term is discouraged because it does not conform to SI standards for unit names. 573:
In reality, individual eyes vary slightly in their luminosity functions. However, photometric units are precisely defined and precisely measurable. They are based on an agreed-upon standard luminosity function based on measurements of the spectral characteristics of image-forming
281:
A flux of 1000 lumens, spread uniformly over an area of 1 square metre, lights up that square metre with an illuminance of 1000 lux. However, the same 1000 lumens spread out over 10 square metres produces a dimmer illuminance of only 100 lux.
561:
This means that white (or whitish) light sources produce far fewer lumens per watt than the theoretical maximum of 683.002 lm/W. The ratio between the actual number of lumens per watt and the theoretical maximum is expressed as a percentage known as the
535:, is the watt per square metre (W/m). There is no single conversion factor between lux and W/m; there is a different conversion factor for every wavelength, and it is not possible to make a conversion unless one knows the spectral composition of the light. 2161:
Skot und Nox Interessant ist in diesem Zusammenhang die EinfĂŒhrung neuer Messeinheiten. Die Voraussetzungen der Forschung beziehungsweise die Erfordernisse an die Leuchtfarben unterschieden sich so stark von allen bis dahin erforschten Gebieten, dass die
297:. To light a factory floor with dozens of times the area of the kitchen would require dozens of such fixtures. Thus, lighting a larger area to the same illuminance (lux) requires a greater luminous flux (lumen). 467:
The illuminance provided by a light source on a surface perpendicular to the direction to the source is a measure of the strength of that source as perceived from that location. For instance, a star of
1899:
Nox, abgek nx, Einheit der DunkelbeleuchtungsstĂ€rke (Dunkelleuchtdichte), welche fĂŒr zahlenmĂ€ĂŸige Angaben und zum Anschluß der DunkelbeleuchtungsstĂ€rke an die normale BeleuchtungsstĂ€rke 1940 von der
2016:
die relative spektrale DĂ€mmerungsempfindlichkeit des menschlichen Auges nach Weaver bedeuten. Dunkelleuchtdichte. Ist das Auge dunkeladaptiert, d.h. einer Leuchtdichte von weniger als 0,01 
2048:" gesagt werden. Als höchstzulĂ€ssiger Grenzwert fĂŒr die Dunkelleuchtdichte ist in Deutschland 10 Skot festgesetzt worden, um eine Verwendung der Dunkelleuchtdichte im Gebiet des gemischten 546:, the amount of illuminance for a given amount of irradiance is maximum: 683.002 lx per 1 W/m; the irradiance needed to make 1 lx at this wavelength is about 1.464  1363: 2024:
eine von der spektralen Hellempfindlichkeitskurve abweichende, nach dem kurzwelligen Ende des Spektrums hin verschobene Empfindlichkeitskurve des Auges, die StÀbchenkurve des
1446:
Starlight illuminance coincides with the human eye's minimum illuminance while moonlight coincides with the human eye's minimum colour vision illuminance (IEE Reviews, 1972,
598:
often include a minimal illuminance level in lux at which the camera will record a satisfactory image. A camera with good low-light capability will have a lower lux rating.
1522: 606:
can generally be used to make pictures at very low illuminance levels, as opposed to the case in video cameras, where a maximal exposure time is generally set by the
2163: 1900: 1704: 1651: 1417: 1598: 550:/m. Other wavelengths of visible light produce fewer lux per watt-per-meter-squared. The luminosity function falls to zero for wavelengths outside the 2056:
zu vermeiden, da in diesem Bereich die photometrischen MaßgrĂ¶ĂŸen wegen der allmĂ€hlich gleitenden Augenempfindlichkeitskurve ihren Sinn verlieren.
226: 153: 1557: 2516: 1680: 1447: 542:(green); the eye's image-forming visual system is more sensitive to light of this wavelength than any other. For monochromatic light 2168: 1905: 710: 2200: 1529: 1461: 1920:
gelten analog die gleichen Festlegungen wie bei der Dunkelleuchtdichte und dem Skot (sk). FĂŒr eine Strahlung der Farbtemperatur
2100: 2037: 1886: 1357: 1269:
recommend that photometric quantities be denoted with a subscript "v" (for "visual") to avoid confusion with radiometric or
1712: 1910:
geschaffen wurde. BezĂŒglich der Farbtemperatur der Strahlung und des Anschlusses von Zahlenwerten der BeleuchtungsstĂ€rke
1788: 2232: 2084: 2028:. Unter Zugrundelegung dieser Empfindlichkeitskurve hat man 1940 in Deutschland die Dunkelleuchtdichte mit der Einheit 646:
candle (one candela) a kilometre away would provide an illuminance of 1 microlux—about the same as a magnitude 1 star.
1565:. Department of Industry and Science, Commonwealth of Australia. p. 61. Archived from the original on 2011-03-02 2422: 2149: 1659: 2566: 2177:
und die DunkelbeleuchtungsstĂ€rke in Nox gemessen. Diese Einheiten grenzten an die bereits bestehenden GrĂ¶ĂŸen der
2526: 1770: 53: 634:
One nox (nx) equals 1 millilux (1 mlx) at light color 2042 K or 2046 K (formerly 2360 K).
2604: 2241: 1583: 190: 134: 703: 2185:
an und dienten der zahlenmĂ€ĂŸigen Erfassung geringster Lichtwerte. So entsprach etwa ein Nox 10 Lux.
2557: 474: 1344: 1238: 2599: 1858: 531:
The lux is one lumen per square metre (lm/m), and the corresponding radiometric unit, which measures
1797: 558:
must include a generous mixture of red and blue wavelengths, to which they are much less sensitive.
2480: 1625: 890: 1862: 2521: 696: 567: 2225: 2072: 1604: 1556:
Pears, Alan (June 1998). "Chapter 7: Appliance technologies and scope for emission reduction".
1266: 229:. In English, "lux" is used as both the singular and plural form. The word is derived from the 1687: 2204: 2076: 1559:
Strategic Study of Household Energy and Greenhouse Issues: A report for Environment Australia
2044:, festgesetzt worden. Die Bezeichnung Skot wurde von der IBK nicht ĂŒbernommen, dafĂŒr soll " 1810: 20: 1927: = 2360 K gilt: 1 nx = 10 lx (Lux). FĂŒr eine beliebige Strahlung 1494: 285:
Achieving an illuminance of 500 lx might be possible in a home kitchen with a single
8: 2506: 1870: 1254: 1213: 1179: 805: 595: 563: 525: 517: 218: 198: 1814: 2045: 1834: 1577: 1418:
NIST Guide to SI Units. Chapter 9 – Rules and Style Conventions for Spelling Unit Names
835: 642: 469: 2544: 2430: 2218: 2096: 2068: 1882: 1838: 1826: 1766: 1353: 1134: 1084: 1007: 967: 286: 1253:" are for length, time and luminous intensity respectively, not the symbols for the 2088: 1874: 1818: 1784: 1476: 1400: 551: 1711:. Occupational Safety and Health Administration, US Dept. of Labor. Archived from 1597:
Australian Greenhouse Office (May 2005). "Chapter 5: Assessing lighting savings".
356: 2297: 2053: 2049: 2025: 2021: 1806: 1792: 1396:
ISO/CIE 23539:2023 CIE TC 2-93 Photometry — The CIE system of physical photometry
752: 1404: 201:, this is used as a measure of the intensity, as perceived by the human eye, of 2571: 2450: 2382: 1938:
lautet die VerknĂŒpfungsbeziehung zwischen in 10 lx gemessenem Zahlenwert {
1320: 504: 496: 2092: 1878: 1480: 2593: 2583: 2511: 2435: 2372: 2362: 2033: 1830: 1749: 1440: 796: 603: 384: 307:
Here are some examples of the illuminance provided under various conditions:
251: 186: 1737: 1339: 254:
is spread over a given area. One can think of luminous flux (with the unit
2455: 2412: 2397: 2352: 2332: 2249: 1127: 812: 772: 767: 599: 587: 262: 255: 194: 108: 2040:(IBK) die Bezugstemperatur auf 2046 K, die Erstarrungstemperatur des 1394: 2327: 2282: 2182: 2174: 2120: 2029: 922: 868: 621: 301: 182: 143: 68: 2141: 620:
The corresponding unit in English and American traditional units is the
2032:(sk) so festgesetzt, daß bei einem Licht der Farbtemperatur 2360 Â° 1822: 1378: 1218: 1022: 913: 607: 532: 521: 214: 210: 206: 2173:
1940 eigene Einheiten ins Leben rief: Die Dunkelleuchtdichte wurde in
2118:
angeregt werden, definiert man die Dunkelleuchtdichte mit der Einheit
1287: 1285: 1283: 2392: 2307: 2178: 875: 816: 671: 638: 591: 547: 539: 435: 325: 274: 120: 1869:(in German) (1 ed.). Berlin / Göttingen / Heidelberg, Germany: 1460:
Kyba, Christopher C. M.; Mohar, Andrej; Posch, Thomas (2017-02-01).
2272: 2115: 2041: 2017: 1280: 492: 459: 447: 1380:
CIE S 017:2020 ILV: International Lighting Vocabulary, 2nd edition
911:
source area. The candela per square metre is sometimes called the
511: 234: 2578: 2460: 2445: 2387: 2317: 2312: 2262: 856: 850: 678:
languages. Use of this code is not recommended in new documents.
654: 419: 337: 270: 116: 304:
can be used. For example, 1 kilolux (klx) is 1000 lx.
2475: 2377: 2287: 2267: 2257: 1340: 1270: 423: 1199:
Luminous efficacy normalized by the maximum possible efficacy
205:
that hits or passes through a surface. It is analogous to the
2490: 2485: 2470: 2347: 2342: 2337: 2322: 2277: 230: 222: 202: 124: 1629: 1596: 37: 2465: 2407: 2402: 2210: 1152: 1146: 1104: 1098: 675: 628: 164: 2083:(in German). Vol. 3 (19 ed.). Leipzig, Germany: 1942:} der BeleuchtungsstĂ€rke und in nx gemessenem Zahlenwert { 225:
visual brightness perception, standardized by the CIE and
2440: 2367: 1275:
USA Standard Letter Symbols for Illuminating Engineering
1208: 58: 2124:(sk) und die DunkelbeleuchtungsstÀrke mit der Einheit 2555: 1686:. Sustainability Victoria. April 2010. Archived from 1231: 581: 2067: 2036:
1 sk = 10 asb gilt. 1948 ist von der
1787:(January 1948) . Written at Braunschweig, Germany. 1681:"How to use a lux meter (Australian recommendation)" 538:
The peak of the luminosity function is at 555 
2114:Dunkelsehen FĂŒr das Dunkelsehen, bei dem nur die 2077:"1. Licht: 1.4. Photometrie: 1.4.1. Grundbegriffe" 1600:Working Energy Resource and Training Kit: Lighting 1805:(1–3). Berlin / Göttingen / Heidelberg, Germany: 1776: 1523:"NOAO Common and Recommended Light Levels Indoor" 1420:, National Institute of Standards and Technology. 2591: 2105:. Order No. 6666211, VLN 294-375/84/88, LSV 1164 1793:"EinfĂŒhrung und Bestimmung des LichtĂ€quivalents" 2007:die relative spektrale Hellempfindlichkeit und 512:Relationship between illuminance and irradiance 2133: 1551: 1549: 1459: 1333: 615: 602:do not use such a specification, since longer 2226: 2142:"1939 bis 1945 – Im Keller glĂŒht das Lumogen" 2061: 1851: 1438: 1260: 704: 2203:Professor Jim Palmer's Radiometry FAQ page ( 1733: 1731: 1341:International Bureau of Weights and Measures 1174:Ratio of luminous flux to power consumption 907:Luminous flux per unit solid angle per unit 570:has a luminous efficiency of only about 2%. 375:Family living room lights (Australia, 1998) 2517:Historical definitions of the SI base units 1782: 1652:"London Underground: Keeping the lights on" 1546: 2233: 2219: 1649: 1515: 711: 697: 36: 2139: 1728: 787:The lumen second is sometimes called the 670:. It is a legacy code to accommodate old 1857: 1441:"Radiometry and photometry in astronomy" 1434: 1432: 1430: 1428: 1426: 649: 2148:(in Austrian German). Vienna, Austria. 1901:Deutschen Lichttechnischen Gesellschaft 631: (ph) equals 10 kilolux (10 klx). 2592: 2038:Internationalen Beleuchtungskommission 1346:The International System of Units (SI) 681: 269:1 lx = 1 lm/m = 1  2214: 2164:Deutsche Lichttechnische Gesellschaft 1958: = (2,161 Â± 0,001) Â· { 1555: 1423: 732: 728: 725: 722: 473:normal illuminance is related to the 250:Illuminance is a measure of how much 42:A lux meter for measuring illuminance 1291:Alternative symbols sometimes seen: 367:Public areas with dark surroundings 1789:Deutsche Physikalische Gesellschaft 1376: 13: 2085:BSB BG Teubner Verlagsgesellschaft 1626:"Low-Light Performance Calculator" 1307:for luminous efficacy of a source. 1237:The symbols in this column denote 582:Use in video-camera specifications 261:One lux is equal to one lumen per 14: 2616: 2194: 1948:} der DunkelbeleuchtungsstĂ€rke: { 1914:und der DunkelbeleuchtungsstĂ€rke 1865:. In Westphal, Wilhelm H. (ed.). 1765:, The Fairmont Press, Inc., 1997 2577: 2565: 2540: 2539: 2140:Keplinger, Thomas (2021-03-29). 2020:ausgesetzt, so gilt infolge des 1763:Applied Illumination Engineering 1709:Regulations (Standards - 29 CFR) 940:(= lumen per square metre) 2152:from the original on 2023-03-16 1863:"Nox, Dunkelleuchtdichte, Skot" 1755: 1743: 1719: 1697: 1673: 1650:Darlington, Paul (2017-12-05). 1643: 1618: 1590: 1366:from the original on 2021-10-18 578:in many individual human eyes. 520:, the lux has a corresponding " 2527:System of units of measurement 1931:spektraler Strahlungsleistung 1487: 1453: 1411: 1387: 1370: 830:Luminous energy per unit time 336:Moonless clear night sky with 324:Moonless, overcast night sky ( 300:As with other named SI units, 245: 240: 16:SI derived unit of illuminance 1: 2201:Radiometry and photometry FAQ 2079:. In Haferkorn, Heinz (ed.). 1326: 1061:lumen second per cubic metre 853:(= lumen per steradian) 213:, but with the power at each 191:International System of Units 2240: 1439:Schlyter, Paul (1997–2009). 1043:Time-integrated illuminance 657:includes a symbol for "lx": 7: 1405:10.25039/IS0.CIE.23539.2023 1314: 1277:USAS Z7.1-1967, Y10.18-1967 616:Non-SI units of illuminance 347:Full moon on a clear night 10: 2621: 2081:Lehrbuch der Physik: Optik 1873:. pp. 125, 271, 389. 1859:Westphal, Wilhelm Heinrich 1469:Astronomy & Geophysics 1462:"How bright is moonlight?" 1126:Ratio of luminous flux to 475:solar illuminance constant 289:fixture with an output of 217:weighted according to the 18: 2535: 2499: 2421: 2296: 2248: 2093:10.1007/978-3-322-96431-1 1879:10.1007/978-3-662-12706-3 1867:Physikalisches Wörterbuch 1725:European law UNI EN 12464 1705:"Illumination. - 1926.56" 1582:: CS1 maint: unfit URL ( 1495:"Electro-Optics Handbook" 1273:quantities. For example: 1203: 1178: 1133: 1083: 1047: 1006: 966: 921: 874: 834: 795: 751: 746: 743: 740: 737: 566:. For example, a typical 193:(SI). It is equal to one 149: 130: 104: 100: 82: 74: 64: 52: 47: 35: 30: 2481:minute and second of arc 1048:Luminous energy density 895:cd/m (= lm/(sr⋅m)) 891:candela per square metre 691:SI photometry quantities 403:Train station platforms 383:Office building hallway/ 316:Surfaces illuminated by 2522:2019 revision of the SI 1481:10.1093/astrogeo/atx025 1303:for luminous flux, and 1267:Standards organizations 1257:litre, tesla and joule. 1182:, luminous coefficient 983:lumen per square metre 867:Luminous flux per unit 568:incandescent light bulb 395:Very dark overcast day 1798:Zeitschrift fĂŒr Physik 434:Overcast day; typical 189:per unit area, in the 2205:University of Arizona 1897:. pp. 125, 271: 1295:for luminous energy, 970:, luminous emittance 650:Legacy Unicode symbol 576:visual photoreception 211:watt per square metre 197:per square metre. In 2605:Units of illuminance 2423:Other accepted units 2073:Schallreuter, Walter 1750:Schlyter, Section 14 596:surveillance cameras 21:Lux (disambiguation) 19:For other uses, see 2507:Conversion of units 2087:. pp. 33–38 . 1871:Springer-Verlag OHG 1815:1948ZPhy..125..133L 1738:Schlyter, Section 7 1180:Luminous efficiency 719: 682:SI photometry units 586:Specifications for 564:luminous efficiency 526:luminosity function 219:luminosity function 95:... is equal to ... 48:General information 2300:with special names 2183:BeleuchtungsstĂ€rke 2112:. pp. 37–38: 2046:skotopisches Stilb 2022:Purkinje-PhĂ€nomens 1823:10.1007/BF01337623 1383:(2 ed.). CIE. 836:Luminous intensity 822:lm (= cd⋅sr) 688: 643:apparent magnitude 544:of this wavelength 470:apparent magnitude 359:under a clear sky 233:word for "light", 160:    151:    140:    135:US customary units 132:    114:    106:    2553: 2552: 2431:astronomical unit 2102:978-3-322-96432-8 1888:978-3-662-12707-0 1783:Lohse, Bernhard; 1761:Jack L. Lindsey, 1399:. ISO/CIE. 2023. 1359:978-92-822-2272-0 1227: 1226: 1135:Luminous efficacy 1085:Luminous efficacy 1008:Luminous exposure 968:Luminous exitance 799:, luminous power 518:photometric units 465: 464: 450:(not direct sun) 313:Illuminance (lux) 287:fluorescent light 181:) is the unit of 171: 170: 83:Conversions 2612: 2600:SI derived units 2582: 2581: 2570: 2569: 2561: 2543: 2542: 2235: 2228: 2221: 2212: 2211: 2188: 2187: 2172: 2158: 2157: 2137: 2131: 2130: 2111: 2110: 2065: 2059: 2058: 2026:DĂ€mmerungssehens 2011: 1976: 1952: 1946: 1918: 1909: 1896: 1895: 1855: 1849: 1848: 1846: 1845: 1780: 1774: 1759: 1753: 1747: 1741: 1735: 1726: 1723: 1717: 1716: 1701: 1695: 1694: 1692: 1685: 1677: 1671: 1670: 1668: 1667: 1658:. Archived from 1647: 1641: 1640: 1638: 1637: 1628:. Archived from 1622: 1616: 1615: 1613: 1612: 1603:. Archived from 1594: 1588: 1587: 1581: 1573: 1571: 1570: 1564: 1553: 1544: 1543: 1541: 1540: 1534: 1528:. Archived from 1527: 1519: 1513: 1512: 1510: 1509: 1499: 1491: 1485: 1484: 1475:(1): 1.31–1.32. 1466: 1457: 1451: 1444: 1436: 1421: 1415: 1409: 1408: 1391: 1385: 1384: 1374: 1368: 1367: 1352:(9th ed.), 1351: 1337: 1308: 1306: 1302: 1298: 1294: 1289: 1278: 1264: 1258: 1235: 1187: 1142: 1094: 1058: 1019: 980: 934: 887: 847: 815:(= candela 809: 764: 720: 713: 706: 699: 692: 687: 669: 666: 663: 661: 552:visible spectrum 490: 488: 426:on a clear day. 411:Office lighting 310: 309: 296: 294: 167: 161: 152: 141: 133: 115: 107: 40: 28: 27: 2620: 2619: 2615: 2614: 2613: 2611: 2610: 2609: 2590: 2589: 2588: 2576: 2564: 2556: 2554: 2549: 2531: 2512:Metric prefixes 2495: 2417: 2299: 2292: 2244: 2239: 2197: 2192: 2191: 2166: 2155: 2153: 2146:Worte im Dunkel 2138: 2134: 2108: 2106: 2103: 2069:Grimsehl, Ernst 2066: 2062: 2015: 2009: 2006: 1996: 1990: 1984: / ∫  1980: 1974: 1972: 1966: Â· ∫  1965: 1957: 1950: 1944: 1937: 1926: 1916: 1903: 1893: 1891: 1889: 1856: 1852: 1843: 1841: 1807:Springer-Verlag 1781: 1777: 1760: 1756: 1748: 1744: 1736: 1729: 1724: 1720: 1703: 1702: 1698: 1690: 1683: 1679: 1678: 1674: 1665: 1663: 1648: 1644: 1635: 1633: 1624: 1623: 1619: 1610: 1608: 1595: 1591: 1575: 1574: 1568: 1566: 1562: 1554: 1547: 1538: 1536: 1532: 1525: 1521: 1520: 1516: 1507: 1505: 1497: 1493: 1492: 1488: 1464: 1458: 1454: 1445: 1437: 1424: 1416: 1412: 1393: 1392: 1388: 1375: 1371: 1360: 1349: 1338: 1334: 1329: 1317: 1312: 1311: 1304: 1300: 1296: 1292: 1290: 1281: 1265: 1261: 1236: 1232: 1223: 1185: 1140: 1090: 1087:(of radiation) 1057: 1051: 1018: 1012: 1002:from a surface 979: 973: 933: 927: 886: 880: 859:(= lm/sr) 846: 840: 808: 802: 763: 757: 753:Luminous energy 730: 718: 717: 690: 684: 667: 664: 659: 658: 652: 618: 584: 514: 486: 484: 482: 292: 290: 248: 243: 162: 159: 150: 139: 131: 113: 105: 43: 24: 17: 12: 11: 5: 2618: 2608: 2607: 2602: 2587: 2586: 2574: 2551: 2550: 2548: 2547: 2536: 2533: 2532: 2530: 2529: 2524: 2519: 2514: 2509: 2503: 2501: 2497: 2496: 2494: 2493: 2488: 2483: 2478: 2473: 2468: 2463: 2458: 2453: 2448: 2443: 2438: 2433: 2427: 2425: 2419: 2418: 2416: 2415: 2410: 2405: 2400: 2395: 2390: 2385: 2380: 2375: 2370: 2365: 2360: 2355: 2350: 2345: 2340: 2335: 2330: 2325: 2320: 2318:degree Celsius 2315: 2310: 2304: 2302: 2298:Derived units 2294: 2293: 2291: 2290: 2285: 2280: 2275: 2270: 2265: 2260: 2254: 2252: 2246: 2245: 2238: 2237: 2230: 2223: 2215: 2209: 2208: 2196: 2195:External links 2193: 2190: 2189: 2132: 2101: 2060: 2054:StĂ€bchensehens 2013: 2004: 1994: 1988: 1978: 1970: 1963: 1955: 1935: 1924: 1887: 1850: 1785:Stille, Ulrich 1775: 1754: 1742: 1727: 1718: 1715:on 2009-05-08. 1696: 1693:on 2011-07-07. 1672: 1642: 1617: 1589: 1545: 1514: 1486: 1452: 1422: 1410: 1386: 1369: 1358: 1343:(2019-05-20), 1331: 1330: 1328: 1325: 1324: 1323: 1321:Exposure value 1316: 1313: 1310: 1309: 1279: 1259: 1229: 1228: 1225: 1224: 1222: 1221: 1216: 1211: 1205: 1201: 1200: 1197: 1192: 1190: 1188: 1183: 1176: 1175: 1172: 1155: 1149: 1143: 1138: 1137:(of a source) 1131: 1130: 1124: 1107: 1101: 1095: 1088: 1081: 1080: 1078: 1065: 1062: 1059: 1055: 1049: 1045: 1044: 1041: 1028: 1025: 1020: 1016: 1010: 1004: 1003: 998:Luminous flux 996: 987: 984: 981: 977: 971: 964: 963: 958:Luminous flux 956: 947: 946:(= lm/m) 941: 935: 931: 925: 919: 918: 905: 896: 893: 888: 884: 878: 872: 871: 865: 860: 854: 848: 844: 838: 832: 831: 828: 823: 820: 810: 804: 800: 793: 792: 785: 776: 770: 765: 761: 755: 749: 748: 745: 742: 739: 735: 734: 731: 727: 724: 716: 715: 708: 701: 693: 689: 683: 680: 651: 648: 617: 614: 604:exposure times 583: 580: 513: 510: 497:Solar constant 480: 463: 462: 456: 455:32,000–100,000 452: 451: 444: 440: 439: 432: 428: 427: 417: 413: 412: 409: 405: 404: 401: 397: 396: 393: 389: 388: 381: 377: 376: 373: 369: 368: 365: 361: 360: 357:civil twilight 355:Dark limit of 353: 349: 348: 345: 341: 340: 334: 330: 329: 322: 318: 317: 314: 279: 278: 247: 244: 242: 239: 169: 168: 157: 147: 146: 137: 128: 127: 111: 102: 101: 98: 97: 92: 85: 84: 80: 79: 76: 72: 71: 66: 62: 61: 56: 50: 49: 45: 44: 41: 33: 32: 15: 9: 6: 4: 3: 2: 2617: 2606: 2603: 2601: 2598: 2597: 2595: 2585: 2580: 2575: 2573: 2568: 2563: 2562: 2559: 2546: 2538: 2537: 2534: 2528: 2525: 2523: 2520: 2518: 2515: 2513: 2510: 2508: 2505: 2504: 2502: 2498: 2492: 2489: 2487: 2484: 2482: 2479: 2477: 2474: 2472: 2469: 2467: 2464: 2462: 2459: 2457: 2454: 2452: 2451:degree of arc 2449: 2447: 2444: 2442: 2439: 2437: 2434: 2432: 2429: 2428: 2426: 2424: 2420: 2414: 2411: 2409: 2406: 2404: 2401: 2399: 2396: 2394: 2391: 2389: 2386: 2384: 2381: 2379: 2376: 2374: 2371: 2369: 2366: 2364: 2361: 2359: 2356: 2354: 2351: 2349: 2346: 2344: 2341: 2339: 2336: 2334: 2331: 2329: 2326: 2324: 2321: 2319: 2316: 2314: 2311: 2309: 2306: 2305: 2303: 2301: 2295: 2289: 2286: 2284: 2281: 2279: 2276: 2274: 2271: 2269: 2266: 2264: 2261: 2259: 2256: 2255: 2253: 2251: 2247: 2243: 2236: 2231: 2229: 2224: 2222: 2217: 2216: 2213: 2206: 2202: 2199: 2198: 2186: 2184: 2180: 2176: 2170: 2165: 2151: 2147: 2143: 2136: 2129: 2127: 2123: 2122: 2117: 2104: 2098: 2094: 2090: 2086: 2082: 2078: 2074: 2070: 2064: 2057: 2055: 2051: 2047: 2043: 2039: 2035: 2031: 2027: 2023: 2019: 2012: 2003: 1999: 1993: 1987: 1983: 1977: 1969: 1961: 1953: 1947: 1941: 1934: 1930: 1923: 1919: 1913: 1907: 1902: 1890: 1884: 1880: 1876: 1872: 1868: 1864: 1860: 1854: 1840: 1836: 1832: 1828: 1824: 1820: 1816: 1812: 1808: 1804: 1801:(in German). 1800: 1799: 1794: 1790: 1786: 1779: 1772: 1768: 1764: 1758: 1751: 1746: 1739: 1734: 1732: 1722: 1714: 1710: 1706: 1700: 1689: 1682: 1676: 1662:on 2018-11-16 1661: 1657: 1656:Rail Engineer 1653: 1646: 1632:on 2013-06-15 1631: 1627: 1621: 1607:on 2007-04-15 1606: 1602: 1601: 1593: 1585: 1579: 1561: 1560: 1552: 1550: 1535:on 2021-07-06 1531: 1524: 1518: 1503: 1496: 1490: 1482: 1478: 1474: 1470: 1463: 1456: 1449: 1442: 1435: 1433: 1431: 1429: 1427: 1419: 1414: 1406: 1402: 1398: 1397: 1390: 1382: 1381: 1373: 1365: 1361: 1355: 1348: 1347: 1342: 1336: 1332: 1322: 1319: 1318: 1288: 1286: 1284: 1276: 1272: 1268: 1263: 1256: 1252: 1248: 1244: 1240: 1234: 1230: 1220: 1217: 1215: 1212: 1210: 1207: 1206: 1202: 1198: 1196: 1193: 1191: 1189: 1184: 1181: 1177: 1173: 1171: 1167: 1163: 1159: 1156: 1154: 1150: 1148: 1144: 1139: 1136: 1132: 1129: 1125: 1123: 1119: 1115: 1111: 1108: 1106: 1102: 1100: 1096: 1093: 1089: 1086: 1082: 1079: 1077: 1073: 1069: 1066: 1063: 1060: 1054: 1050: 1046: 1042: 1040: 1036: 1032: 1029: 1026: 1024: 1021: 1015: 1011: 1009: 1005: 1001: 997: 995: 991: 988: 985: 982: 976: 972: 969: 965: 962:on a surface 961: 957: 955: 951: 948: 945: 942: 939: 936: 930: 926: 924: 920: 916: 915: 910: 906: 904: 900: 897: 894: 892: 889: 883: 879: 877: 873: 870: 866: 864: 861: 858: 855: 852: 849: 843: 839: 837: 833: 829: 827: 824: 821: 818: 814: 811: 807: 801: 798: 797:Luminous flux 794: 790: 786: 784: 780: 777: 774: 771: 769: 766: 760: 756: 754: 750: 736: 721: 714: 709: 707: 702: 700: 695: 694: 686: 679: 677: 673: 656: 647: 644: 640: 635: 632: 630: 625: 623: 613: 611: 609: 605: 601: 600:Still cameras 597: 593: 589: 588:video cameras 579: 577: 571: 569: 565: 559: 555: 553: 549: 545: 541: 536: 534: 529: 527: 523: 519: 509: 506: 500: 498: 494: 479: 476: 471: 461: 457: 454: 453: 449: 445: 443:10,000–25,000 442: 441: 437: 433: 430: 429: 425: 421: 418: 415: 414: 410: 407: 406: 402: 399: 398: 394: 391: 390: 386: 382: 379: 378: 374: 371: 370: 366: 363: 362: 358: 354: 351: 350: 346: 343: 342: 339: 335: 332: 331: 327: 323: 320: 319: 315: 312: 311: 308: 305: 303: 298: 288: 283: 276: 272: 268: 267: 266: 264: 259: 257: 253: 252:luminous flux 238: 236: 232: 228: 224: 221:, a model of 220: 216: 212: 208: 204: 200: 196: 192: 188: 187:luminous flux 184: 180: 176: 166: 158: 155: 148: 145: 138: 136: 129: 126: 122: 118: 112: 110: 109:SI base units 103: 99: 96: 93: 91: 87: 86: 81: 77: 73: 70: 67: 63: 60: 57: 55: 51: 46: 39: 34: 29: 26: 22: 2456:electronvolt 2357: 2179:Leuchtdichte 2160: 2154:. Retrieved 2145: 2135: 2125: 2119: 2113: 2107:. Retrieved 2080: 2063: 2008: 2001: 1997: 1991: 1985: 1981: 1973: 1967: 1959: 1949: 1943: 1939: 1932: 1928: 1921: 1915: 1911: 1898: 1892:. Retrieved 1866: 1853: 1842:. Retrieved 1802: 1796: 1778: 1762: 1757: 1745: 1721: 1713:the original 1708: 1699: 1688:the original 1675: 1664:. Retrieved 1660:the original 1655: 1645: 1634:. Retrieved 1630:the original 1620: 1609:. Retrieved 1605:the original 1599: 1592: 1567:. Retrieved 1558: 1537:. Retrieved 1530:the original 1517: 1506:. Retrieved 1504:. p. 63 1502:photonis.com 1501: 1489: 1472: 1468: 1455: 1413: 1395: 1389: 1379: 1377:CIE (2020). 1372: 1345: 1335: 1274: 1262: 1250: 1246: 1242: 1233: 1194: 1169: 1165: 1161: 1157: 1128:radiant flux 1121: 1117: 1113: 1109: 1091: 1075: 1071: 1067: 1052: 1038: 1034: 1030: 1013: 999: 993: 989: 974: 959: 953: 949: 943: 937: 928: 912: 908: 902: 898: 881: 862: 841: 825: 788: 782: 778: 768:lumen second 758: 685: 653: 636: 633: 626: 619: 612: 585: 575: 572: 560: 556: 543: 537: 530: 515: 501: 477: 466: 306: 299: 295: lumens 284: 280: 263:square metre 260: 249: 178: 174: 172: 94: 89: 65:Unit of 25: 2167: [ 1904: [ 1809:: 133–158. 923:Illuminance 869:solid angle 622:foot-candle 522:radiometric 483:, equal to 302:SI prefixes 246:Illuminance 241:Explanation 207:radiometric 183:illuminance 69:illuminance 54:Unit system 2594:Categories 2250:Base units 2156:2023-03-16 2109:2023-03-16 1964:10 lx 1894:2023-03-16 1844:2023-03-19 1771:0881732125 1666:2017-12-20 1636:2010-09-27 1611:2007-03-17 1569:2008-06-26 1539:2016-11-13 1508:2012-04-02 1327:References 1239:dimensions 1219:Radiometry 1214:Photometry 1204:See also: 1145:lumen per 1097:lumen per 1023:lux second 672:code pages 608:frame rate 592:camcorders 533:irradiance 215:wavelength 199:photometry 88:1 lx 2393:steradian 2308:becquerel 2075:(1988) . 1929:bekannter 1839:125512557 1831:0044-3328 1578:cite book 1448:page 1183 909:projected 876:Luminance 817:steradian 729:Dimension 723:Quantity 668:SQUARE LX 639:astronomy 516:Like all 489: lux 438:lighting 436:TV studio 387:lighting 326:starlight 177:(symbol: 2545:Category 2500:See also 2273:kilogram 2242:SI units 2150:Archived 2116:StĂ€bchen 2000:, wobei 1861:(1952). 1773:page 218 1364:archived 1315:See also 960:incident 674:in some 665:㏓ 590:such as 493:Sunlight 460:sunlight 448:daylight 344:0.05–0.3 163:10  2572:Physics 2558:Portals 2461:hectare 2446:decibel 2388:sievert 2383:siemens 2313:coulomb 2263:candela 2042:Platins 1811:Bibcode 1791:(ed.). 1249:" and " 1064:lm⋅s/m 1000:emitted 851:candela 747:Symbol 741:Symbol 655:Unicode 458:Direct 420:Sunrise 408:320–500 338:airglow 142:0.0929 2584:Energy 2476:minute 2436:dalton 2378:radian 2373:pascal 2363:newton 2288:second 2268:kelvin 2258:ampere 2099:  2052:- und 2050:Zapfen 1885:  1837:  1829:  1769:  1356:  1271:photon 789:talbot 733:Notes 662: 660:U+33D3 505:normal 424:sunset 385:toilet 321:0.0001 90:in ... 75:Symbol 2491:tonne 2486:neper 2471:litre 2413:weber 2398:tesla 2353:lumen 2348:katal 2343:joule 2338:hertz 2333:henry 2323:farad 2278:metre 2171:] 1908:] 1835:S2CID 1691:(PDF) 1684:(PDF) 1563:(PDF) 1533:(PDF) 1526:(PDF) 1498:(pdf) 1465:(PDF) 1350:(PDF) 1255:units 1027:lx⋅s 986:lm/m 813:lumen 744:Name 738:Name 726:Unit 676:Asian 491:(see 446:Full 364:20–50 333:0.002 256:lumen 231:Latin 223:human 209:unit 203:light 195:lumen 185:, or 156:units 2466:hour 2408:watt 2403:volt 2328:gray 2283:mole 2181:und 2175:Skot 2121:Skot 2097:ISBN 2030:Skot 1883:ISBN 1827:ISSN 1767:ISBN 1584:link 1354:ISBN 1245:", " 1147:watt 1099:watt 629:phot 627:One 594:and 495:and 431:1000 173:The 2441:day 2368:ohm 2358:lux 2126:Nox 2089:doi 2018:asb 2014:λ,W 1979:λ,W 1875:doi 1819:doi 1803:125 1477:doi 1401:doi 1299:or 1241:; " 1151:lm/ 1103:lm/ 938:lux 914:nit 775:⋅s 637:In 499:). 487:000 485:128 422:or 416:400 400:150 392:100 352:3.4 293:000 277:/m. 235:lux 227:ISO 175:lux 154:CGS 31:lux 2596:: 2207:). 2169:de 2159:. 2144:. 2095:. 2071:; 1998:dλ 1982:dλ 1956:nx 1906:de 1881:. 1833:. 1825:. 1817:. 1795:. 1730:^ 1707:. 1654:. 1580:}} 1576:{{ 1548:^ 1500:. 1473:58 1471:. 1467:. 1450:). 1425:^ 1362:, 1282:^ 1209:SI 944:lx 917:. 857:cd 819:) 791:. 773:lm 641:, 610:. 554:. 548:mW 540:nm 528:. 481:sc 380:80 372:50 328:) 291:12 275:sr 271:cd 265:: 237:. 179:lx 165:ph 144:fc 121:sr 117:cd 78:lx 59:SI 2560:: 2234:e 2227:t 2220:v 2091:: 2034:K 2010:V 2005:λ 2002:V 1995:λ 1992:V 1989:λ 1986:S 1975:V 1971:λ 1968:S 1962:} 1960:E 1954:} 1951:E 1945:E 1940:E 1936:1 1933:S 1925:1 1922:T 1917:E 1912:E 1877:: 1847:. 1821:: 1813:: 1752:. 1740:. 1669:. 1639:. 1614:. 1586:) 1572:. 1542:. 1511:. 1483:. 1479:: 1443:. 1407:. 1403:: 1305:ρ 1301:F 1297:P 1293:W 1251:J 1247:T 1243:L 1195:1 1186:V 1170:J 1168:⋅ 1166:T 1164:⋅ 1162:L 1160:⋅ 1158:M 1153:W 1141:η 1122:J 1120:⋅ 1118:T 1116:⋅ 1114:L 1112:⋅ 1110:M 1105:W 1092:K 1076:J 1074:⋅ 1072:T 1070:⋅ 1068:L 1056:v 1053:ω 1039:J 1037:⋅ 1035:T 1033:⋅ 1031:L 1017:v 1014:H 994:J 992:⋅ 990:L 978:v 975:M 954:J 952:⋅ 950:L 932:v 929:E 903:J 901:⋅ 899:L 885:v 882:L 863:J 845:v 842:I 826:J 806:v 803:Ί 783:J 781:⋅ 779:T 762:v 759:Q 712:e 705:t 698:v 478:E 273:· 125:m 123:⋅ 119:⋅ 23:.

Index

Lux (disambiguation)

Unit system
SI
illuminance
SI base units
cd
sr
m
US customary units
fc
CGS
ph
illuminance
luminous flux
International System of Units
lumen
photometry
light
radiometric
watt per square metre
wavelength
luminosity function
human
ISO
Latin
lux
luminous flux
lumen
square metre

Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.

↑