Reptile Lamp Database

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.

WARNING: The measurement range (350 - 800 nm) is not sufficient for this evaluation! Data is only available in the range 350.83 - 1100 nm. Results are shown anyway but should be ignored by anyone except experts.

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	( 0.33 ; 0.34 )	( 0.41 ; 0.37 )	( 0.28 ; 0.3 ; 0.27 )
CCT	5800 Kelvin	4800 Kelvin	5200 Kelvin
distance		0.031	0.03
colour space			3-D-graph not implemented yet

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 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).

total ( 0 nm - 0 nm)	3430 µW/cm² = 34.3 W/m²
UVC ( 0 nm - 280 nm)	0 µW/cm² = 0 W/m²
non-terrestrial ( 0 nm - 290 nm)	0 µW/cm² = 0 W/m²
total2 ( 250 nm - 880 nm)	2550 µW/cm² = 25.5 W/m²
UVB (EU) ( 280 nm - 315 nm)	0 µW/cm² = 0 W/m²
UVB (US) ( 280 nm - 320 nm)	0 µW/cm² = 0 W/m²
UVA+B ( 280 nm - 380 nm)	54.8 µW/cm² = 0.548 W/m²
Solar UVB ( 290 nm - 315 nm)	0 µW/cm² = 0 W/m²
UVA D3 regulating ( 315 nm - 335 nm)	0 µW/cm² = 0 W/m²
UVA (EU) ( 315 nm - 380 nm)	54.8 µW/cm² = 0.548 W/m²
UVA2 (medical definition) ( 320 nm - 340 nm)	0 µW/cm² = 0 W/m²
UVA (US) ( 320 nm - 380 nm)	54.8 µW/cm² = 0.548 W/m²
UVA1 (variant) ( 335 nm - 380 nm)	54.8 µW/cm² = 0.548 W/m²
UVA1 (medical) ( 340 nm - 400 nm)	104 µW/cm² = 1.04 W/m²
vis. UVA ( 350 nm - 380 nm)	54.8 µW/cm² = 0.548 W/m²
VIS Rep3 ( 350 nm - 600 nm)	1000 µW/cm² = 10 W/m²
VIS Rep4 ( 350 nm - 700 nm)	1390 µW/cm² = 13.9 W/m²
purple ( 380 nm - 420 nm)	124 µW/cm² = 1.24 W/m²
VIS ( 380 nm - 780 nm)	1790 µW/cm² = 17.9 W/m²
VIS2 ( 400 nm - 680 nm)	1220 µW/cm² = 12.2 W/m²
PAR ( 400 nm - 700 nm)	1290 µW/cm² = 12.9 W/m²
tmp ( 400 nm - 1100 nm)	3330 µW/cm² = 33.3 W/m²
blue ( 420 nm - 490 nm)	314 µW/cm² = 3.14 W/m²
green ( 490 nm - 575 nm)	403 µW/cm² = 4.03 W/m²
yellow ( 575 nm - 585 nm)	45.1 µW/cm² = 0.451 W/m²
orange ( 585 nm - 650 nm)	269 µW/cm² = 2.69 W/m²
red ( 650 nm - 780 nm)	638 µW/cm² = 6.38 W/m²
IRA ( 700 nm - 1400 nm)	2040 µW/cm² = 20.4 W/m²
IR2 ( 720 nm - 1100 nm)	1960 µW/cm² = 19.6 W/m²
IRB ( 1400 nm - 3000 nm)	0 µW/cm² = 0 W/m²

Erythema	0.0119 UV-Index
Pyrimidine dimerization of DNA	0.0067 µW/cm²
Photoceratitis	0 µW/cm²
Photoconjunctivitis	0 µW/cm²
DNA Damage	3.68E-5
Vitamin D3	0 µW/cm²
Photosynthesis	913 µW/cm²
Luminosity	3530 lx
Human L-Cone	525 µW/cm²
Human M-Cone	442 µW/cm²
Human S-Cone	257 µW/cm²
CIE X	466 µW/cm²
CIE Y	489 µW/cm²
CIE Z	477 µW/cm²
PAR	6070000 mol photons
Extinction preD3	0 e-3*m²/mol
Extinction Tachysterol	0 e-3*m²/mol
Exctincition PreD3	26 m²/mol
Extinction Lumisterol	0 m²/mol
Exctincition Tachysterol	494 m²/mol
Extinction 7DHC	0 m²/mol
L-Cone	446 µW/cm²
M-Cone	470 µW/cm²
S-Cone	424 µW/cm²
U-Cone	252 µW/cm²
UVR - ICNIRP 2004	0.00797 Rel Biol Eff
Melatonin Supression	392 µW/cm²
Blue Light Hazard	296 µW/cm² (83.8 µW/cm² per 1000 lx)
CIE 174:2006 PreVit D3	0 µW/cm²
Lumen Reptil	3690 "pseudo-lx"
Vitamin D3 Degradation	0 µW/cm²
Actinic UV	0.00797 µW/cm² (0.0226 mW/klm)
Exctincition Lumisterol	0 m²/mol
Exctincition 7DHC	0 m²/mol
Exctincition Toxisterols	28.6 m²/mol

Solarmeter 6.2 (UVB, pre 2010)	0.378 µW/cm²
Solarmeter 6.5 (UV-Index, pre 2010)	0.00453
Leybold UVB	0 µW/cm²
Leybold UVA	41.4 µW/cm²
Leybold UVC	0 µW/cm²
DeltaOhm UVB	0.00084 µW/cm²
DeltaOhm UVC	0 µW/cm²
Vernier UVB	0 µW/cm²
Vernier UVA	18.4 µW/cm²
Gröbel UVA	42.6 µW/cm²
Gröbel UVB	-0.00535 µW/cm²
Gröbel UVC	0 µW/cm²
Luxmeter	3580 lx
Solarmeter 6.4 (D3)	0.0141 IU/min
UVX-31	1.84 µW/cm²
IL UVB	0.000188 µW/cm²
IL UVA	52.6 µW/cm²
Solarmeter 6.5 (UVI, post 2010)	0.00158 UV-Index
Solarmeter 6.2 (UVB, post 2010)	0.0151 µW/cm² (Solarmeter Ratio = 9.58)
Solarmeter AlGaN 6.5 UVI sensor	0.0153 UV Index
GenUV 7.1 UV-Index	0.017 UV-Index
Solarmeter 10.0 (Global Power) (manuf.)	46.3 W/m²
Solarmeter 4.0 (UVA)	1.04 mW/cm²
LS122 (manuf.)	9.1 W/m²
ISM400 (first guess)	51.3 W/m²
LS122 (assumption)	8.94 W/m²
ISM400_new	57.8 W/m²
Solarmeter 10.0 (Global Power) (assumption)	46.7 W/m²