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	( 0.38 ; 0.38 )	( 0.44 ; 0.33 )	( 0.38 ; 0.28 ; 0.2 )
CCT	4100 Kelvin	4200 Kelvin	3900 Kelvin
distance		0.0074	0.016
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)	809 µW/cm² = 8.09 W/m²
UVC ( 0 nm - 280 nm)	30.2 µW/cm² = 0.302 W/m²
non-terrestrial ( 0 nm - 290 nm)	51.1 µW/cm² = 0.511 W/m²
total2 ( 250 nm - 880 nm)	809 µW/cm² = 8.09 W/m²
UVB (EU) ( 280 nm - 315 nm)	25.7 µW/cm² = 0.257 W/m²
UVB (US) ( 280 nm - 320 nm)	25.9 µW/cm² = 0.259 W/m²
UVA+B ( 280 nm - 380 nm)	32.7 µW/cm² = 0.327 W/m²
Solar UVB ( 290 nm - 315 nm)	4.86 µW/cm² = 0.0486 W/m²
UVA D3 regulating ( 315 nm - 335 nm)	0.478 µW/cm² = 0.00478 W/m²
UVA (EU) ( 315 nm - 380 nm)	7.01 µW/cm² = 0.0701 W/m²
UVA2 (medical definition) ( 320 nm - 340 nm)	0.408 µW/cm² = 0.00408 W/m²
UVA (US) ( 320 nm - 380 nm)	6.86 µW/cm² = 0.0686 W/m²
UVA1 (variant) ( 335 nm - 380 nm)	6.54 µW/cm² = 0.0654 W/m²
UVA1 (medical) ( 340 nm - 400 nm)	52.7 µW/cm² = 0.527 W/m²
vis. UVA ( 350 nm - 380 nm)	6.27 µW/cm² = 0.0627 W/m²
VIS Rep3 ( 350 nm - 600 nm)	543 µW/cm² = 5.43 W/m²
VIS Rep4 ( 350 nm - 700 nm)	740 µW/cm² = 7.4 W/m²
purple ( 380 nm - 420 nm)	65.2 µW/cm² = 0.652 W/m²
VIS ( 380 nm - 780 nm)	746 µW/cm² = 7.46 W/m²
VIS2 ( 400 nm - 680 nm)	676 µW/cm² = 6.76 W/m²
PAR ( 400 nm - 700 nm)	688 µW/cm² = 6.88 W/m²
tmp ( 400 nm - 1100 nm)	700 µW/cm² = 7 W/m²
blue ( 420 nm - 490 nm)	135 µW/cm² = 1.35 W/m²
green ( 490 nm - 575 nm)	238 µW/cm² = 2.38 W/m²
yellow ( 575 nm - 585 nm)	39.5 µW/cm² = 0.395 W/m²
orange ( 585 nm - 650 nm)	209 µW/cm² = 2.09 W/m²
red ( 650 nm - 780 nm)	59.1 µW/cm² = 0.591 W/m²
IRA ( 700 nm - 1400 nm)	12.2 µW/cm² = 0.122 W/m²
IR2 ( 720 nm - 1100 nm)	6.35 µW/cm² = 0.0635 W/m²
IRB ( 1400 nm - 3000 nm)	0 µW/cm² = 0 W/m²

Erythema	22 UV-Index
Pyrimidine dimerization of DNA	5.29 µW/cm²
Photoceratitis	26.3 µW/cm²
Photoconjunctivitis	23.1 µW/cm²
DNA Damage	34.1
Vitamin D3	28.9 µW/cm²
Photosynthesis	446 µW/cm²
Luminosity	2410 lx
Human L-Cone	367 µW/cm²
Human M-Cone	286 µW/cm²
Human S-Cone	110 µW/cm²
CIE X	333 µW/cm²
CIE Y	336 µW/cm²
CIE Z	215 µW/cm²
PAR	3260000 mol photons
Extinction preD3	358 e-3*m²/mol
Extinction Tachysterol	1110 e-3*m²/mol
Exctincition PreD3	319000 m²/mol
Extinction Lumisterol	384 m²/mol
Exctincition Tachysterol	1400000 m²/mol
Extinction 7DHC	496 m²/mol
L-Cone	321 µW/cm²
M-Cone	234 µW/cm²
S-Cone	173 µW/cm²
U-Cone	121 µW/cm²
UVR - ICNIRP 2004	46.8 Rel Biol Eff
Melatonin Supression	171 µW/cm²
Blue Light Hazard	118 µW/cm² (48.9 µW/cm² per 1000 lx)
CIE 174:2006 PreVit D3	27.9 µW/cm²
Lumen Reptil	2070 "pseudo-lx"
Vitamin D3 Degradation	35.6 µW/cm²
Actinic UV	46.5 µW/cm² (193 mW/klm)
Exctincition Lumisterol	436000 m²/mol
Exctincition 7DHC	539000 m²/mol
Exctincition Toxisterols	36000 m²/mol

Solarmeter 6.2 (UVB, pre 2010)	81.3 µW/cm²
Solarmeter 6.5 (UV-Index, pre 2010)	16.1
Leybold UVB	7.66 µW/cm²
Leybold UVA	8.47 µW/cm²
Leybold UVC	10.4 µW/cm²
DeltaOhm UVB	16.8 µW/cm²
DeltaOhm UVC	23.8 µW/cm²
Vernier UVB	14.9 µW/cm²
Vernier UVA	2.52 µW/cm²
Gröbel UVA	5.38 µW/cm²
Gröbel UVB	36.1 µW/cm²
Gröbel UVC	16.9 µW/cm²
Luxmeter	2440 lx
Solarmeter 6.4 (D3)	50.2 IU/min
UVX-31	18 µW/cm²
IL UVB	0.0334 µW/cm²
IL UVA	8.06 µW/cm²
Solarmeter 6.5 (UVI, post 2010)	7.69 UV-Index
Solarmeter 6.2 (UVB, post 2010)	23.8 µW/cm² (Solarmeter Ratio = 3.1)
Solarmeter AlGaN 6.5 UVI sensor	37.1 UV Index
GenUV 7.1 UV-Index	2.41 UV-Index
Solarmeter 10.0 (Global Power) (manuf.)	8.09 W/m²
Solarmeter 4.0 (UVA)	0.403 mW/cm²
LS122 (manuf.)	2.46E-6 W/m²
ISM400 (first guess)	5.58 W/m²
LS122 (assumption)	0.304 W/m²
ISM400_new	4.5 W/m²
Solarmeter 10.0 (Global Power) (assumption)	7.78 W/m²