Reptile Lamp Database

wavelength correction "-0.5 nm"

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 (ASTM spectrum).

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	( 0.36 ; 0.36 )	( 0.22 ; 0.36 )	( 0.28 ; 0.16 ; 0.26 )
CCT	4600 Kelvin	15000 Kelvin	6100 Kelvin
distance		0.041	0.11
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 readings of two solarmeters 6.2 (UVB) and 6.5 (UV index) 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)	12100 µW/cm² = 121 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)	12100 µW/cm² = 121 W/m²
UVB (EU) ( 280 nm - 315 nm)	61.4 µW/cm² = 0.614 W/m²
UVB (US) ( 280 nm - 320 nm)	73.7 µW/cm² = 0.737 W/m²
UVA+B ( 280 nm - 380 nm)	1720 µW/cm² = 17.2 W/m²
Solar UVB ( 290 nm - 315 nm)	61.4 µW/cm² = 0.614 W/m²
UVA D3 regulating ( 315 nm - 335 nm)	128 µW/cm² = 1.28 W/m²
UVA (EU) ( 315 nm - 380 nm)	1660 µW/cm² = 16.6 W/m²
UVA2 (medical definition) ( 320 nm - 340 nm)	174 µW/cm² = 1.74 W/m²
UVA (US) ( 320 nm - 380 nm)	1640 µW/cm² = 16.4 W/m²
UVA1 (variant) ( 335 nm - 380 nm)	1530 µW/cm² = 15.3 W/m²
UVA1 (medical) ( 340 nm - 400 nm)	2030 µW/cm² = 20.3 W/m²
vis. UVA ( 350 nm - 380 nm)	1390 µW/cm² = 13.9 W/m²
VIS Rep3 ( 350 nm - 600 nm)	9680 µW/cm² = 96.8 W/m²
VIS Rep4 ( 350 nm - 700 nm)	10800 µW/cm² = 108 W/m²
purple ( 380 nm - 420 nm)	1580 µW/cm² = 15.8 W/m²
VIS ( 380 nm - 780 nm)	9710 µW/cm² = 97.1 W/m²
VIS2 ( 400 nm - 680 nm)	8750 µW/cm² = 87.5 W/m²
PAR ( 400 nm - 700 nm)	8850 µW/cm² = 88.5 W/m²
tmp ( 400 nm - 1100 nm)	9780 µW/cm² = 97.8 W/m²
blue ( 420 nm - 490 nm)	2080 µW/cm² = 20.8 W/m²
green ( 490 nm - 575 nm)	2650 µW/cm² = 26.5 W/m²
yellow ( 575 nm - 585 nm)	527 µW/cm² = 5.27 W/m²
orange ( 585 nm - 650 nm)	2290 µW/cm² = 22.9 W/m²
red ( 650 nm - 780 nm)	588 µW/cm² = 5.88 W/m²
IR2 ( 655 nm - 685 nm)	191 µW/cm² = 1.91 W/m²
IRA ( 700 nm - 1400 nm)	923 µW/cm² = 9.23 W/m²
IRB ( 1400 nm - 3000 nm)	0 µW/cm² = 0 W/m²

Erythema	1.89 UV-Index
Pyrimidine dimerization of DNA	24.3 µW/cm²
Photoceratitis	3.46 µW/cm²
Photoconjunctivitis	0.0145 µW/cm²
DNA Damage	0.0713
Vitamin D3	7.75 µW/cm²
Photosynthesis	5780 µW/cm²
Luminosity	30300 lx
Human L-Cone	4590 µW/cm²
Human M-Cone	3650 µW/cm²
Human S-Cone	1890 µW/cm²
CIE X	4190 µW/cm²
CIE Y	4220 µW/cm²
CIE Z	3320 µW/cm²
PAR PPFD	439 µmol/m²/s
Extinction preD3	71 e-3*m²/mol
Extinction Tachysterol	247 e-3*m²/mol
Exctincition PreD3	35900 m²/mol
Extinction Lumisterol	3.59 m²/mol
Exctincition Tachysterol	398000 m²/mol
Extinction 7DHC	1.54 m²/mol
L-Cone	3960 µW/cm²
M-Cone	2210 µW/cm²
S-Cone	3670 µW/cm²
U-Cone	4240 µW/cm²
UVR - ICNIRP 2004	1.12 Rel Biol Eff
Melatonin Supression	2520 µW/cm²
Blue Light Hazard	2240 µW/cm² (73.9 µW/cm² per 1000 lx)
CIE 174:2006 PreVit D3	7.86 µW/cm²
Lumen Reptil	31100 "pseudo-lx"
Vitamin D3 Degradation	13.6 µW/cm²
Actinic UV	1.09 µW/cm² (0.359 mW/klm)
Exctincition Lumisterol	8000 m²/mol
Exctincition 7DHC	3220 m²/mol
Exctincition Toxisterols	7580 m²/mol

Solarmeter 6.2 (UVB, pre 2010)	91.1 µW/cm²
Solarmeter 6.5 (UV-Index, pre 2010)	2.2
Leybold UVB	65.3 µW/cm²
Leybold UVA	1230 µW/cm²
Leybold UVC	0 µW/cm²
DeltaOhm UVB	175 µW/cm²
DeltaOhm UVC	17.8 µW/cm²
Vernier UVB	17.7 µW/cm²
Vernier UVA	627 µW/cm²
Gröbel UVA	1400 µW/cm²
Gröbel UVB	31.3 µW/cm²
Gröbel UVC	-0.0246 µW/cm²
Luxmeter	31500 lx
Solarmeter 6.4 (D3)	6.88 IU/min
UVX-31	245 µW/cm²
IL UVB	0.0426 µW/cm²
IL UVA	1510 µW/cm²
Solarmeter 6.5 (UVI, post 2010)	2.04 UV-Index
Solarmeter 6.2 (UVB, post 2010)	57.7 µW/cm² (Solarmeter Ratio = 28.3)
Solarmeter AlGaN 6.5 UVI sensor	42 UV Index
GenUV 7.1 UV-Index	2.54 UV-Index
Solarmeter 10.0 (Global Power) (manuf.)	114 W/m²
Solarmeter 4.0 (UVA)	23.8 mW/cm²
LS122 (manuf.)	0.956 W/m²
ISM400 (first guess)	78.9 W/m²
LS122 (assumption)	4.37 W/m²
ISM400_new	67.2 W/m²
Solarmeter 10.0 (Global Power) (assumption)	106 W/m²