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	( 0.26 ; 0.29 )	( 0.32 ; 0.53 )	( 0.22 ; 0.25 ; 0.41 )
CCT	12000 Kelvin	6700 Kelvin	6900 Kelvin
distance		0.19	0.14
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)	1230 µW/cm² = 12.3 W/m²
UVC ( 0 nm - 280 nm)	1.39 µW/cm² = 0.0139 W/m²
non-terrestrial ( 0 nm - 290 nm)	1.97 µW/cm² = 0.0197 W/m²
total2 ( 250 nm - 880 nm)	1230 µW/cm² = 12.3 W/m²
UVB (EU) ( 280 nm - 315 nm)	51.6 µW/cm² = 0.516 W/m²
UVB (US) ( 280 nm - 320 nm)	77.8 µW/cm² = 0.778 W/m²
UVA+B ( 280 nm - 380 nm)	230 µW/cm² = 2.3 W/m²
Solar UVB ( 290 nm - 315 nm)	51 µW/cm² = 0.51 W/m²
UVA D3 regulating ( 315 nm - 335 nm)	93.2 µW/cm² = 0.932 W/m²
UVA (EU) ( 315 nm - 380 nm)	178 µW/cm² = 1.78 W/m²
UVA2 (medical definition) ( 320 nm - 340 nm)	82.7 µW/cm² = 0.827 W/m²
UVA (US) ( 320 nm - 380 nm)	152 µW/cm² = 1.52 W/m²
UVA1 (variant) ( 335 nm - 380 nm)	85.1 µW/cm² = 0.851 W/m²
UVA1 (medical) ( 340 nm - 400 nm)	79.5 µW/cm² = 0.795 W/m²
vis. UVA ( 350 nm - 380 nm)	49.2 µW/cm² = 0.492 W/m²
VIS Rep3 ( 350 nm - 600 nm)	919 µW/cm² = 9.19 W/m²
VIS Rep4 ( 350 nm - 700 nm)	1030 µW/cm² = 10.3 W/m²
purple ( 380 nm - 420 nm)	80.3 µW/cm² = 0.803 W/m²
VIS ( 380 nm - 780 nm)	994 µW/cm² = 9.94 W/m²
VIS2 ( 400 nm - 680 nm)	968 µW/cm² = 9.68 W/m²
PAR ( 400 nm - 700 nm)	974 µW/cm² = 9.74 W/m²
tmp ( 400 nm - 1100 nm)	988 µW/cm² = 9.88 W/m²
blue ( 420 nm - 490 nm)	395 µW/cm² = 3.95 W/m²
green ( 490 nm - 575 nm)	329 µW/cm² = 3.29 W/m²
yellow ( 575 nm - 585 nm)	37.2 µW/cm² = 0.372 W/m²
orange ( 585 nm - 650 nm)	125 µW/cm² = 1.25 W/m²
red ( 650 nm - 780 nm)	27.6 µW/cm² = 0.276 W/m²
IRA ( 700 nm - 1400 nm)	14 µW/cm² = 0.14 W/m²
IR2 ( 720 nm - 1100 nm)	6.86 µW/cm² = 0.0686 W/m²
IRB ( 1400 nm - 3000 nm)	0 µW/cm² = 0 W/m²

Erythema	4.57 UV-Index
Pyrimidine dimerization of DNA	32.1 µW/cm²
Photoceratitis	6.65 µW/cm²
Photoconjunctivitis	1.43 µW/cm²
DNA Damage	1.99
Vitamin D3	16.6 µW/cm²
Photosynthesis	688 µW/cm²
Luminosity	2810 lx
Human L-Cone	404 µW/cm²
Human M-Cone	381 µW/cm²
Human S-Cone	331 µW/cm²
CIE X	355 µW/cm²
CIE Y	391 µW/cm²
CIE Z	609 µW/cm²
PAR	4520000 mol photons
Extinction preD3	104 e-3*m²/mol
Extinction Tachysterol	350 e-3*m²/mol
Exctincition PreD3	55700 m²/mol
Extinction Lumisterol	30.8 m²/mol
Exctincition Tachysterol	469000 m²/mol
Extinction 7DHC	32.9 m²/mol
L-Cone	317 µW/cm²
M-Cone	357 µW/cm²
S-Cone	595 µW/cm²
U-Cone	177 µW/cm²
UVR - ICNIRP 2004	4.78 Rel Biol Eff
Melatonin Supression	418 µW/cm²
Blue Light Hazard	368 µW/cm² (131 µW/cm² per 1000 lx)
CIE 174:2006 PreVit D3	18.2 µW/cm²
Lumen Reptil	3230 "pseudo-lx"
Vitamin D3 Degradation	15.9 µW/cm²
Actinic UV	4.73 µW/cm² (16.8 mW/klm)
Exctincition Lumisterol	38100 m²/mol
Exctincition 7DHC	38400 m²/mol
Exctincition Toxisterols	12200 m²/mol

Solarmeter 6.2 (UVB, pre 2010)	91.8 µW/cm²
Solarmeter 6.5 (UV-Index, pre 2010)	4.84
Leybold UVB	65.8 µW/cm²
Leybold UVA	97.3 µW/cm²
Leybold UVC	1.06 µW/cm²
DeltaOhm UVB	129 µW/cm²
DeltaOhm UVC	19 µW/cm²
Vernier UVB	26.2 µW/cm²
Vernier UVA	133 µW/cm²
Gröbel UVA	145 µW/cm²
Gröbel UVB	36 µW/cm²
Gröbel UVC	1.11 µW/cm²
Luxmeter	2970 lx
Solarmeter 6.4 (D3)	15.1 IU/min
UVX-31	136 µW/cm²
IL UVB	0.0374 µW/cm²
IL UVA	119 µW/cm²
Solarmeter 6.5 (UVI, post 2010)	3.83 UV-Index
Solarmeter 6.2 (UVB, post 2010)	57.9 µW/cm² (Solarmeter Ratio = 15.1)
Solarmeter AlGaN 6.5 UVI sensor	44.5 UV Index
GenUV 7.1 UV-Index	2.44 UV-Index
Solarmeter 10.0 (Global Power) (manuf.)	10.2 W/m²
Solarmeter 4.0 (UVA)	1.67 mW/cm²
LS122 (manuf.)	0.00278 W/m²
ISM400 (first guess)	5.68 W/m²
LS122 (assumption)	0.252 W/m²
ISM400_new	4.31 W/m²
Solarmeter 10.0 (Global Power) (assumption)	8.99 W/m²