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.

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	( 0.3 ; 0.31 )	( 0.27 ; 0.43 )	( 0.23 ; 0.2 ; 0.33 )
CCT	7400 Kelvin	8800 Kelvin	7100 Kelvin
distance		0.094	0.078
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)	13900 µW/cm² = 139 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)	13600 µW/cm² = 136 W/m²
UVB (EU) ( 280 nm - 315 nm)	409 µW/cm² = 4.09 W/m²
UVB (US) ( 280 nm - 320 nm)	671 µW/cm² = 6.71 W/m²
UVA+B ( 280 nm - 380 nm)	4780 µW/cm² = 47.8 W/m²
Solar UVB ( 290 nm - 315 nm)	409 µW/cm² = 4.09 W/m²
UVA D3 regulating ( 315 nm - 335 nm)	1310 µW/cm² = 13.1 W/m²
UVA (EU) ( 315 nm - 380 nm)	4370 µW/cm² = 43.7 W/m²
UVA2 (medical definition) ( 320 nm - 340 nm)	1490 µW/cm² = 14.9 W/m²
UVA (US) ( 320 nm - 380 nm)	4100 µW/cm² = 41 W/m²
UVA1 (variant) ( 335 nm - 380 nm)	3060 µW/cm² = 30.6 W/m²
UVA1 (medical) ( 340 nm - 400 nm)	2810 µW/cm² = 28.1 W/m²
vis. UVA ( 350 nm - 380 nm)	1700 µW/cm² = 17 W/m²
VIS Rep3 ( 350 nm - 600 nm)	8690 µW/cm² = 86.9 W/m²
VIS Rep4 ( 350 nm - 700 nm)	10200 µW/cm² = 102 W/m²
purple ( 380 nm - 420 nm)	885 µW/cm² = 8.85 W/m²
VIS ( 380 nm - 780 nm)	8730 µW/cm² = 87.3 W/m²
VIS2 ( 400 nm - 680 nm)	8280 µW/cm² = 82.8 W/m²
PAR ( 400 nm - 700 nm)	8340 µW/cm² = 83.4 W/m²
tmp ( 400 nm - 1100 nm)	8970 µW/cm² = 89.7 W/m²
blue ( 420 nm - 490 nm)	2810 µW/cm² = 28.1 W/m²
green ( 490 nm - 575 nm)	2630 µW/cm² = 26.3 W/m²
yellow ( 575 nm - 585 nm)	392 µW/cm² = 3.92 W/m²
orange ( 585 nm - 650 nm)	1630 µW/cm² = 16.3 W/m²
red ( 650 nm - 780 nm)	379 µW/cm² = 3.79 W/m²
IRA ( 700 nm - 1400 nm)	628 µW/cm² = 6.28 W/m²
IR2 ( 720 nm - 1100 nm)	495 µW/cm² = 4.95 W/m²
IRB ( 1400 nm - 3000 nm)	0 µW/cm² = 0 W/m²

Erythema	24.2 UV-Index
Pyrimidine dimerization of DNA	259 µW/cm²
Photoceratitis	36.8 µW/cm²
Photoconjunctivitis	0.654 µW/cm²
DNA Damage	2.34
Vitamin D3	103 µW/cm²
Photosynthesis	5740 µW/cm²
Luminosity	25300 lx
Human L-Cone	3750 µW/cm²
Human M-Cone	3230 µW/cm²
Human S-Cone	2390 µW/cm²
CIE X	3420 µW/cm²
CIE Y	3530 µW/cm²
CIE Z	4380 µW/cm²
PAR	39900000 mol photons
Extinction preD3	731 e-3*m²/mol
Extinction Tachysterol	2630 e-3*m²/mol
Exctincition PreD3	361000 m²/mol
Extinction Lumisterol	94.2 m²/mol
Exctincition Tachysterol	3990000 m²/mol
Extinction 7DHC	82.5 m²/mol
L-Cone	3060 µW/cm²
M-Cone	2700 µW/cm²
S-Cone	4340 µW/cm²
U-Cone	3070 µW/cm²
UVR - ICNIRP 2004	18.4 Rel Biol Eff
Melatonin Supression	3080 µW/cm²
Blue Light Hazard	2710 µW/cm² (107 µW/cm² per 1000 lx)
CIE 174:2006 PreVit D3	112 µW/cm²
Lumen Reptil	28700 "pseudo-lx"
Vitamin D3 Degradation	134 µW/cm²
Actinic UV	18.3 µW/cm² (7.21 mW/klm)
Exctincition Lumisterol	142000 m²/mol
Exctincition 7DHC	109000 m²/mol
Exctincition Toxisterols	69900 m²/mol

Solarmeter 6.2 (UVB, pre 2010)	846 µW/cm²
Solarmeter 6.5 (UV-Index, pre 2010)	30
Leybold UVB	600 µW/cm²
Leybold UVA	3070 µW/cm²
Leybold UVC	0.0386 µW/cm²
DeltaOhm UVB	1650 µW/cm²
DeltaOhm UVC	175 µW/cm²
Vernier UVB	221 µW/cm²
Vernier UVA	3290 µW/cm²
Gröbel UVA	3720 µW/cm²
Gröbel UVB	298 µW/cm²
Gröbel UVC	-0.18 µW/cm²
Luxmeter	26100 lx
Solarmeter 6.4 (D3)	93.6 IU/min
UVX-31	1880 µW/cm²
IL UVB	0.378 µW/cm²
IL UVA	3430 µW/cm²
Solarmeter 6.5 (UVI, post 2010)	25.1 UV-Index
Solarmeter 6.2 (UVB, post 2010)	582 µW/cm² (Solarmeter Ratio = 23.1)
Solarmeter AlGaN 6.5 UVI sensor	355 UV Index
GenUV 7.1 UV-Index	20.4 UV-Index
Solarmeter 10.0 (Global Power) (manuf.)	112 W/m²
Solarmeter 4.0 (UVA)	44.3 mW/cm²
LS122 (manuf.)	3.53 W/m²
ISM400 (first guess)	65.4 W/m²
LS122 (assumption)	5.85 W/m²
ISM400_new	55.6 W/m²
Solarmeter 10.0 (Global Power) (assumption)	95.7 W/m²