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	( 0.33 ; 0.36 )	( 0.29 ; 0.34 )	( 0.25 ; 0.22 ; 0.25 )
CCT	5700 Kelvin	8100 Kelvin	6400 Kelvin
distance		0.00016	0.041
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)	5890 µW/cm² = 58.9 W/m²
UVC ( 0 nm - 280 nm)	104 µW/cm² = 1.04 W/m²
non-terrestrial ( 0 nm - 290 nm)	135 µW/cm² = 1.35 W/m²
total2 ( 250 nm - 880 nm)	5890 µW/cm² = 58.9 W/m²
UVB (EU) ( 280 nm - 315 nm)	260 µW/cm² = 2.6 W/m²
UVB (US) ( 280 nm - 320 nm)	274 µW/cm² = 2.74 W/m²
UVA+B ( 280 nm - 380 nm)	1090 µW/cm² = 10.9 W/m²
Solar UVB ( 290 nm - 315 nm)	228 µW/cm² = 2.28 W/m²
UVA D3 regulating ( 315 nm - 335 nm)	110 µW/cm² = 1.1 W/m²
UVA (EU) ( 315 nm - 380 nm)	832 µW/cm² = 8.32 W/m²
UVA2 (medical definition) ( 320 nm - 340 nm)	166 µW/cm² = 1.66 W/m²
UVA (US) ( 320 nm - 380 nm)	817 µW/cm² = 8.17 W/m²
UVA1 (variant) ( 335 nm - 380 nm)	721 µW/cm² = 7.21 W/m²
UVA1 (medical) ( 340 nm - 400 nm)	895 µW/cm² = 8.95 W/m²
vis. UVA ( 350 nm - 380 nm)	578 µW/cm² = 5.78 W/m²
VIS Rep3 ( 350 nm - 600 nm)	4460 µW/cm² = 44.6 W/m²
VIS Rep4 ( 350 nm - 700 nm)	4960 µW/cm² = 49.6 W/m²
purple ( 380 nm - 420 nm)	773 µW/cm² = 7.73 W/m²
VIS ( 380 nm - 780 nm)	4490 µW/cm² = 44.9 W/m²
VIS2 ( 400 nm - 680 nm)	4100 µW/cm² = 41 W/m²
PAR ( 400 nm - 700 nm)	4140 µW/cm² = 41.4 W/m²
tmp ( 400 nm - 1100 nm)	4450 µW/cm² = 44.5 W/m²
blue ( 420 nm - 490 nm)	1060 µW/cm² = 10.6 W/m²
green ( 490 nm - 575 nm)	1430 µW/cm² = 14.3 W/m²
yellow ( 575 nm - 585 nm)	177 µW/cm² = 1.77 W/m²
orange ( 585 nm - 650 nm)	819 µW/cm² = 8.19 W/m²
red ( 650 nm - 780 nm)	231 µW/cm² = 2.31 W/m²
IRA ( 700 nm - 1400 nm)	306 µW/cm² = 3.06 W/m²
IR2 ( 720 nm - 1100 nm)	280 µW/cm² = 2.8 W/m²
IRB ( 1400 nm - 3000 nm)	0 µW/cm² = 0 W/m²

Erythema	84.7 UV-Index
Pyrimidine dimerization of DNA	126 µW/cm²
Photoceratitis	94.6 µW/cm²
Photoconjunctivitis	99.6 µW/cm²
DNA Damage	116
Vitamin D3	141 µW/cm²
Photosynthesis	2770 µW/cm²
Luminosity	13000 lx
Human L-Cone	1930 µW/cm²
Human M-Cone	1640 µW/cm²
Human S-Cone	916 µW/cm²
CIE X	1660 µW/cm²
CIE Y	1810 µW/cm²
CIE Z	1620 µW/cm²
PAR	20100000 mol photons
Extinction preD3	1450 e-3*m²/mol
Extinction Tachysterol	3750 e-3*m²/mol
Exctincition PreD3	1220000 m²/mol
Extinction Lumisterol	1110 m²/mol
Exctincition Tachysterol	4720000 m²/mol
Extinction 7DHC	1330 m²/mol
L-Cone	1620 µW/cm²
M-Cone	1440 µW/cm²
S-Cone	1670 µW/cm²
U-Cone	1810 µW/cm²
UVR - ICNIRP 2004	138 Rel Biol Eff
Melatonin Supression	1380 µW/cm²
Blue Light Hazard	1110 µW/cm² (85.8 µW/cm² per 1000 lx)
CIE 174:2006 PreVit D3	146 µW/cm²
Lumen Reptil	14500 "pseudo-lx"
Vitamin D3 Degradation	96.9 µW/cm²
Actinic UV	137 µW/cm² (105 mW/klm)
Exctincition Lumisterol	1210000 m²/mol
Exctincition 7DHC	1410000 m²/mol
Exctincition Toxisterols	428000 m²/mol

Solarmeter 6.2 (UVB, pre 2010)	437 µW/cm²
Solarmeter 6.5 (UV-Index, pre 2010)	46.6
Leybold UVB	219 µW/cm²
Leybold UVA	632 µW/cm²
Leybold UVC	81.6 µW/cm²
DeltaOhm UVB	321 µW/cm²
DeltaOhm UVC	137 µW/cm²
Vernier UVB	134 µW/cm²
Vernier UVA	474 µW/cm²
Gröbel UVA	750 µW/cm²
Gröbel UVB	197 µW/cm²
Gröbel UVC	87.7 µW/cm²
Luxmeter	13600 lx
Solarmeter 6.4 (D3)	146 IU/min
UVX-31	379 µW/cm²
IL UVB	0.177 µW/cm²
IL UVA	752 µW/cm²
Solarmeter 6.5 (UVI, post 2010)	35.4 UV-Index
Solarmeter 6.2 (UVB, post 2010)	188 µW/cm² (Solarmeter Ratio = 5.32)
Solarmeter AlGaN 6.5 UVI sensor	217 UV Index
GenUV 7.1 UV-Index	14.2 UV-Index
Solarmeter 10.0 (Global Power) (manuf.)	51.4 W/m²
Solarmeter 4.0 (UVA)	11.4 mW/cm²
LS122 (manuf.)	0.214 W/m²
ISM400 (first guess)	32.7 W/m²
LS122 (assumption)	1.63 W/m²
ISM400_new	27 W/m²
Solarmeter 10.0 (Global Power) (assumption)	46.2 W/m²