4500 Kelvin
Spectrum 129: SW-BB4500 Edit
DeleteMeasurement
| Brand |
other other |
|---|---|
| Lamp Product |
Black Body Radiation Black Body Radiation I(lambda in meters) prop.to 1/lambda^5/(exp(0.014388/lambda/KELVIN)-1) |
| Lamp ID |
SW-BB4500 (03/2010) |
| Spectrometer | - |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 0 cm |
| Age | 0 hours |
| Originator (measurement) | Sarina Wunderlich |
Database entry created:
Sarina Wunderlich
12/Mar/2010 ; updated:
Sarina Wunderlich
5/May/2021
Colorimetry
Colorimetry is the science to describe physically the human color perception. The wavelength range 380 nm - 780 nm is visible to humans and detected by three different photoreceptors. Many Reptiles see the range 350 nm - 800 nm and have an additional UV photoreceptor in their retina.
Whereas a spectrometer measures the intensity in every tiny wavelength interval resulting in thousands of individual intensities, the human eye only measures three intensities detected by the three cones. The same is true for the reptile eye with usually three or four photoreceptors. Effectively the detailled spectrum displayed above reduces to a much compacter bar graph displayed below. The photoreceptor sensitivites from these L-Cone, M-Cone, S-Cone, and U-Cone are used, they are chosen as an average of measured reptile photoreceptor sensitivity curves. The bar graph also shows as reference the intensity seen by the three or four photoreceptors for average sunlight (id 1).
From these three numbers the colour coordinate and the correlated colour temperature for humans are calculated using the CIE standard method. I adapted this concept to a "3 cone reptile (M,S,U)" and a "4 cone reptile (L,M,S,U)". I am sure, that this adaption to other colour spaces makes sense mathematically and this is also done in scientific research regarding colour vision of animals, however I have not seen calculation of colour temperatures for other animals in the scientific literature. Even if it is hypothetical, at least this shows, how arbitrary the colour temperature is, and that the colour temperature calculated for humans does not apply to reptiles. The colour spaces also show the colour coordinates of different phases of daylight ((ids 1, 338 – 451, 511 – 513 ), indicated by crosses, coloured in the appriximate colour perceived by a human.
| Human (CIE) | 3 cone reptile | 4 cone reptile | |
|---|---|---|---|
| Cone Excitation | |||
| Colour Coordinate | ( 0.36 ; 0.36 ) | ( 0.43 ; 0.34 ) | ( 0.33 ; 0.29 ; 0.23 ) |
| CCT | 4500 Kelvin | 4500 Kelvin | 4500 Kelvin |
| distance | 4.0E-5 | 0.00032 | |
| colour space | 3-D-graph not implemented yet |
Vitamin D3 Analysis
Vitamin D3 is produced by UVB radiation around 300 nm. 7DHC/ProD3 present in the skin is converted to PreD3 when absorbing an UV photon. PreD3 can be converted back to ProD3, to Lumisterol, or to Tachysterol when absorbing another UV photon or can be converted to Vitamin D3 in a warm environment.
This process prevents any overdose of vitamin D3 from UV radiation with a spectrum similar to sunlight. As a comparison the solar spectra at 20°(id:14) and at 85°(id:21) solar angle are shown.
The ratio of the two solarmeters 6.2 (UVB) and 6.5 (UV index) readings has proven a useful and very simply number to acess the spectral shape in the vitamin-d3-active region.
Effective Irradiances
Effective irradiances are calculated for all ranges, actionspectra and radiometers currently present in this database.
The calculation method is a numerical implementation (Simpson's rule) of the formula
To learn more about calculating effective irradiances and radiometers I recommend this excellent report on UVB meters: Characterizing the Performance of Integral Measuring UV-Meters (pdf).
The numbers in the following tables can also be used to estimate certain (effective) irradiances from radiomer readings. Example: If the database lists
- range: UVB (US) = 13.8 µW/cm²
- radiometer: Solarmeter 6.2 = 19.6 µW/cm²
Ranges
total ( 0 nm - 0 nm) 309000 µW/cm² = 3090 W/m² UVC ( 0 nm - 280 nm) 1020 µW/cm² = 10.2 W/m² non-terrestrial ( 0 nm - 290 nm) 1370 µW/cm² = 13.7 W/m² total2 ( 250 nm - 880 nm) 146000 µW/cm² = 1460 W/m² UVB (EU) ( 280 nm - 315 nm) 1620 µW/cm² = 16.2 W/m² UVB (US) ( 280 nm - 320 nm) 1940 µW/cm² = 19.4 W/m² UVA+B ( 280 nm - 380 nm) 8080 µW/cm² = 80.8 W/m² Solar UVB ( 290 nm - 315 nm) 1260 µW/cm² = 12.6 W/m² UVA D3 regulating ( 315 nm - 335 nm) 1460 µW/cm² = 14.6 W/m² UVA (EU) ( 315 nm - 380 nm) 6470 µW/cm² = 64.7 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 1570 µW/cm² = 15.7 W/m² UVA (US) ( 320 nm - 380 nm) 6140 µW/cm² = 61.4 W/m² UVA1 (variant) ( 335 nm - 380 nm) 5000 µW/cm² = 50 W/m² UVA1 (medical) ( 340 nm - 400 nm) 7600 µW/cm² = 76 W/m² vis. UVA ( 350 nm - 380 nm) 3610 µW/cm² = 36.1 W/m² VIS Rep3 ( 350 nm - 600 nm) 57900 µW/cm² = 579 W/m² VIS Rep4 ( 350 nm - 700 nm) 89400 µW/cm² = 894 W/m² purple ( 380 nm - 420 nm) 6550 µW/cm² = 65.5 W/m² VIS ( 380 nm - 780 nm) 110000 µW/cm² = 1100 W/m² PAR ( 400 nm - 700 nm) 82700 µW/cm² = 827 W/m² blue ( 420 nm - 490 nm) 15800 µW/cm² = 158 W/m² green ( 490 nm - 575 nm) 24300 µW/cm² = 243 W/m² yellow ( 575 nm - 585 nm) 3070 µW/cm² = 30.7 W/m² orange ( 585 nm - 650 nm) 20400 µW/cm² = 204 W/m² red ( 650 nm - 780 nm) 39900 µW/cm² = 399 W/m² IRA ( 700 nm - 1400 nm) 141000 µW/cm² = 1410 W/m² IRB ( 1400 nm - 3000 nm) 61200 µW/cm² = 612 W/m²
Actionspectra
Erythema 640 UV-Index Pyrimidine dimerization of DNA 845 µW/cm² Photoceratitis 828 µW/cm² Photoconjunctivitis 789 µW/cm² DNA Damage 1070 Vitamin D3 1120 µW/cm² Photosynthesis 58400 µW/cm² Luminosity 228000 lx Human L-Cone 34500 µW/cm² Human M-Cone 27300 µW/cm² Human S-Cone 12800 µW/cm² CIE X 31400 µW/cm² CIE Y 31600 µW/cm² CIE Z 23900 µW/cm² PAR 398000000 mol photons Extinction preD3 12000 e-3*m²/mol Extinction Tachysterol 31000 e-3*m²/mol Exctincition PreD3 9900000 m²/mol Extinction Lumisterol 9340 m²/mol Exctincition Tachysterol 39100000 m²/mol Extinction 7DHC 11200 m²/mol L-Cone 30300 µW/cm² M-Cone 26400 µW/cm² S-Cone 21000 µW/cm² U-Cone 14700 µW/cm² UVR - ICNIRP 2004 1160 Rel Biol Eff Melatonin Supression 20200 µW/cm² Blue Light Hazard 14800 µW/cm² (65.2 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 1150 µW/cm² Lumen Reptil 219000 "pseudo-lx" Vitamin D3 Degradation 855 µW/cm² Actinic UV 1160 µW/cm² (50.8 mW/klm) Exctincition Lumisterol 9950000 m²/mol Exctincition 7DHC 11900000 m²/mol Exctincition Toxisterols 4160000 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 3320 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 413 Leybold UVB 1480 µW/cm² Leybold UVA 4640 µW/cm² Leybold UVC 577 µW/cm² DeltaOhm UVB 2660 µW/cm² DeltaOhm UVC 1150 µW/cm² Vernier UVB 1140 µW/cm² Vernier UVA 4190 µW/cm² Gröbel UVA 5330 µW/cm² Gröbel UVB 1520 µW/cm² Gröbel UVC 658 µW/cm² Solarmeter 6.4 (D3) 1290 IU/min UVX-31 3000 µW/cm² IL UVB 1.41 µW/cm² IL UVA 5460 µW/cm² Solarmeter 6.5 (UVI, post 2010) 268 UV-Index Solarmeter 6.2 (UVB, post 2010) 1460 µW/cm² (Solarmeter Ratio = 5.46) Solarmeter AlGaN 6.5 UVI sensor 1590 UV Index GenUV 7.1 UV-Index 105 UV-Index Solarmeter 10.0 (Global Power) 2560 W/m² Solarmeter 4.0 (UVA) 91 mW/cm² LS122 1050 W/m² ISM400 2740 W/m²