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	( 0.29 ; 0.3 )	( 0.36 ; 0.42 )	( 0.22 ; 0.28 ; 0.32 )
CCT	8400 Kelvin	5700 Kelvin	6300 Kelvin
distance		0.073	0.065
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)	1030 µW/cm² = 10.3 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)	1030 µW/cm² = 10.3 W/m²
UVB (EU) ( 280 nm - 315 nm)	0.753 µW/cm² = 0.00753 W/m²
UVB (US) ( 280 nm - 320 nm)	0.893 µW/cm² = 0.00893 W/m²
UVA+B ( 280 nm - 380 nm)	28.9 µW/cm² = 0.289 W/m²
Solar UVB ( 290 nm - 315 nm)	0.753 µW/cm² = 0.00753 W/m²
UVA D3 regulating ( 315 nm - 335 nm)	0.503 µW/cm² = 0.00503 W/m²
UVA (EU) ( 315 nm - 380 nm)	28.1 µW/cm² = 0.281 W/m²
UVA2 (medical definition) ( 320 nm - 340 nm)	0.484 µW/cm² = 0.00484 W/m²
UVA (US) ( 320 nm - 380 nm)	28 µW/cm² = 0.28 W/m²
UVA1 (variant) ( 335 nm - 380 nm)	27.6 µW/cm² = 0.276 W/m²
UVA1 (medical) ( 340 nm - 400 nm)	79.2 µW/cm² = 0.792 W/m²
vis. UVA ( 350 nm - 380 nm)	27.2 µW/cm² = 0.272 W/m²
VIS Rep3 ( 350 nm - 600 nm)	790 µW/cm² = 7.9 W/m²
VIS Rep4 ( 350 nm - 700 nm)	999 µW/cm² = 9.99 W/m²
purple ( 380 nm - 420 nm)	124 µW/cm² = 1.24 W/m²
VIS ( 380 nm - 780 nm)	1000 µW/cm² = 10 W/m²
VIS2 ( 400 nm - 680 nm)	897 µW/cm² = 8.97 W/m²
PAR ( 400 nm - 700 nm)	920 µW/cm² = 9.2 W/m²
tmp ( 400 nm - 1100 nm)	953 µW/cm² = 9.53 W/m²
blue ( 420 nm - 490 nm)	286 µW/cm² = 2.86 W/m²
green ( 490 nm - 575 nm)	281 µW/cm² = 2.81 W/m²
yellow ( 575 nm - 585 nm)	29.1 µW/cm² = 0.291 W/m²
orange ( 585 nm - 650 nm)	173 µW/cm² = 1.73 W/m²
red ( 650 nm - 780 nm)	107 µW/cm² = 1.07 W/m²
IRA ( 700 nm - 1400 nm)	33.3 µW/cm² = 0.333 W/m²
IR2 ( 720 nm - 1100 nm)	19.2 µW/cm² = 0.192 W/m²
IRB ( 1400 nm - 3000 nm)	0 µW/cm² = 0 W/m²

Erythema	0.158 UV-Index
Pyrimidine dimerization of DNA	0.452 µW/cm²
Photoceratitis	0.23 µW/cm²
Photoconjunctivitis	0.0118 µW/cm²
DNA Damage	0.0411
Vitamin D3	0.467 µW/cm²
Photosynthesis	660 µW/cm²
Luminosity	2380 lx
Human L-Cone	351 µW/cm²
Human M-Cone	305 µW/cm²
Human S-Cone	246 µW/cm²
CIE X	324 µW/cm²
CIE Y	328 µW/cm²
CIE Z	452 µW/cm²
PAR PPFD	42 µmol/m²/s
Extinction preD3	1.85 e-3*m²/mol
Extinction Tachysterol	7.08 e-3*m²/mol
Exctincition PreD3	1030 m²/mol
Extinction Lumisterol	1.1 m²/mol
Exctincition Tachysterol	9270 m²/mol
Extinction 7DHC	1.49 m²/mol
L-Cone	290 µW/cm²
M-Cone	365 µW/cm²
S-Cone	418 µW/cm²
U-Cone	223 µW/cm²
UVR - ICNIRP 2004	0.187 Rel Biol Eff
Melatonin Supression	353 µW/cm²
Blue Light Hazard	283 µW/cm² (119 µW/cm² per 1000 lx)
CIE 174:2006 PreVit D3	0.492 µW/cm²
Lumen Reptil	2890 "pseudo-lx"
Vitamin D3 Degradation	0.251 µW/cm²
Actinic UV	0.186 µW/cm² (0.78 mW/klm)
Exctincition Lumisterol	1300 m²/mol
Exctincition 7DHC	1740 m²/mol
Exctincition Toxisterols	93.6 m²/mol

Solarmeter 6.2 (UVB, pre 2010)	1.4 µW/cm²
Solarmeter 6.5 (UV-Index, pre 2010)	0.141
Leybold UVB	0.767 µW/cm²
Leybold UVA	21.9 µW/cm²
Leybold UVC	0.00113 µW/cm²
DeltaOhm UVB	1.08 µW/cm²
DeltaOhm UVC	0.193 µW/cm²
Vernier UVB	0.488 µW/cm²
Vernier UVA	8.5 µW/cm²
Gröbel UVA	21.1 µW/cm²
Gröbel UVB	0.623 µW/cm²
Gröbel UVC	0.000304 µW/cm²
Luxmeter	2440 lx
Solarmeter 6.4 (D3)	0.44 IU/min
UVX-31	1.47 µW/cm²
IL UVB	0.000577 µW/cm²
IL UVA	29 µW/cm²
Solarmeter 6.5 (UVI, post 2010)	0.0904 UV-Index
Solarmeter 6.2 (UVB, post 2010)	0.56 µW/cm² (Solarmeter Ratio = 6.2)
Solarmeter AlGaN 6.5 UVI sensor	0.683 UV Index
GenUV 7.1 UV-Index	0.0472 UV-Index
Solarmeter 10.0 (Global Power) (manuf.)	10.1 W/m²
Solarmeter 4.0 (UVA)	0.746 mW/cm²
LS122 (manuf.)	0.00306 W/m²
ISM400 (first guess)	6.7 W/m²
LS122 (assumption)	0.31 W/m²
ISM400_new	5.4 W/m²
Solarmeter 10.0 (Global Power) (assumption)	9.44 W/m²