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	( 0.34 ; 0.28 )	( 0.23 ; 0.35 )	( 0.21 ; 0.18 ; 0.28 )
CCT	4800 Kelvin	15000 Kelvin	8900 Kelvin
distance		0.028	0.061
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)	4450000 µW/cm² = 44500 W/m²
UVC ( 0 nm - 280 nm)	44800 µW/cm² = 448 W/m²
non-terrestrial ( 0 nm - 290 nm)	67200 µW/cm² = 672 W/m²
total2 ( 250 nm - 880 nm)	2010000 µW/cm² = 20100 W/m²
UVB (EU) ( 280 nm - 315 nm)	104000 µW/cm² = 1040 W/m²
UVB (US) ( 280 nm - 320 nm)	126000 µW/cm² = 1260 W/m²
UVA+B ( 280 nm - 380 nm)	454000 µW/cm² = 4540 W/m²
Solar UVB ( 290 nm - 315 nm)	82000 µW/cm² = 820 W/m²
UVA D3 regulating ( 315 nm - 335 nm)	98500 µW/cm² = 985 W/m²
UVA (EU) ( 315 nm - 380 nm)	349000 µW/cm² = 3490 W/m²
UVA2 (medical definition) ( 320 nm - 340 nm)	132000 µW/cm² = 1320 W/m²
UVA (US) ( 320 nm - 380 nm)	328000 µW/cm² = 3280 W/m²
UVA1 (variant) ( 335 nm - 380 nm)	251000 µW/cm² = 2510 W/m²
UVA1 (medical) ( 340 nm - 400 nm)	342000 µW/cm² = 3420 W/m²
vis. UVA ( 350 nm - 380 nm)	110000 µW/cm² = 1100 W/m²
VIS Rep3 ( 350 nm - 600 nm)	946000 µW/cm² = 9460 W/m²
VIS Rep4 ( 350 nm - 700 nm)	1190000 µW/cm² = 11900 W/m²
purple ( 380 nm - 420 nm)	282000 µW/cm² = 2820 W/m²
VIS ( 380 nm - 780 nm)	1230000 µW/cm² = 12300 W/m²
VIS2 ( 400 nm - 680 nm)	902000 µW/cm² = 9020 W/m²
PAR ( 400 nm - 700 nm)	936000 µW/cm² = 9360 W/m²
tmp ( 400 nm - 1100 nm)	2160000 µW/cm² = 21600 W/m²
blue ( 420 nm - 490 nm)	277000 µW/cm² = 2770 W/m²
green ( 490 nm - 575 nm)	145000 µW/cm² = 1450 W/m²
yellow ( 575 nm - 585 nm)	104000 µW/cm² = 1040 W/m²
orange ( 585 nm - 650 nm)	188000 µW/cm² = 1880 W/m²
red ( 650 nm - 780 nm)	237000 µW/cm² = 2370 W/m²
IRA ( 700 nm - 1400 nm)	1760000 µW/cm² = 17600 W/m²
IR2 ( 720 nm - 1100 nm)	1190000 µW/cm² = 11900 W/m²
IRB ( 1400 nm - 3000 nm)	1110000 µW/cm² = 11100 W/m²

Erythema	37000 UV-Index
Pyrimidine dimerization of DNA	66300 µW/cm²
Photoceratitis	46800 µW/cm²
Photoconjunctivitis	38400 µW/cm²
DNA Damage	49900
Vitamin D3	72200 µW/cm²
Photosynthesis	669000 µW/cm²
Luminosity	2250000 lx
Human L-Cone	349000 µW/cm²
Human M-Cone	257000 µW/cm²
Human S-Cone	234000 µW/cm²
CIE X	380000 µW/cm²
CIE Y	307000 µW/cm²
CIE Z	427000 µW/cm²
PAR	4780000000 mol photons
Extinction preD3	646000 e-3*m²/mol
Extinction Tachysterol	1810000 e-3*m²/mol
Exctincition PreD3	527000000 m²/mol
Extinction Lumisterol	518000 m²/mol
Exctincition Tachysterol	2320000000 m²/mol
Extinction 7DHC	619000 m²/mol
L-Cone	312000 µW/cm²
M-Cone	266000 µW/cm²
S-Cone	416000 µW/cm²
U-Cone	500000 µW/cm²
UVR - ICNIRP 2004	65400 Rel Biol Eff
Melatonin Supression	337000 µW/cm²
Blue Light Hazard	263000 µW/cm² (117 µW/cm² per 1000 lx)
CIE 174:2006 PreVit D3	76000 µW/cm²
Lumen Reptil	3240000 "pseudo-lx"
Vitamin D3 Degradation	55600 µW/cm²
Actinic UV	64800 µW/cm² (287 mW/klm)
Exctincition Lumisterol	579000000 m²/mol
Exctincition 7DHC	669000000 m²/mol
Exctincition Toxisterols	140000000 m²/mol

Solarmeter 6.2 (UVB, pre 2010)	206000 µW/cm²
Solarmeter 6.5 (UV-Index, pre 2010)	26700
Leybold UVB	98100 µW/cm²
Leybold UVA	274000 µW/cm²
Leybold UVC	26400 µW/cm²
DeltaOhm UVB	174000 µW/cm²
DeltaOhm UVC	57100 µW/cm²
Vernier UVB	67100 µW/cm²
Vernier UVA	229000 µW/cm²
Gröbel UVA	307000 µW/cm²
Gröbel UVB	100000 µW/cm²
Gröbel UVC	31900 µW/cm²
Luxmeter	2250000 lx
Solarmeter 6.4 (D3)	83600 IU/min
UVX-31	208000 µW/cm²
IL UVB	90.6 µW/cm²
IL UVA	283000 µW/cm²
Solarmeter 6.5 (UVI, post 2010)	17600 UV-Index
Solarmeter 6.2 (UVB, post 2010)	88900 µW/cm² (Solarmeter Ratio = 5.04)
Solarmeter AlGaN 6.5 UVI sensor	109000 UV Index
GenUV 7.1 UV-Index	6570 UV-Index
Solarmeter 10.0 (Global Power) (manuf.)	32200 W/m²
Solarmeter 4.0 (UVA)	4320 mW/cm²
LS122 (manuf.)	24800 W/m²
ISM400 (first guess)	33000 W/m²
LS122 (assumption)	22800 W/m²
ISM400_new	38200 W/m²
Solarmeter 10.0 (Global Power) (assumption)	30900 W/m²