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	( 0.32 ; 0.32 )	( 0.29 ; 0.45 )	( 0.26 ; 0.21 ; 0.33 )
CCT	6400 Kelvin	7600 Kelvin	6000 Kelvin
distance		0.11	0.089
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)	2930 µW/cm² = 29.3 W/m²
UVC ( 0 nm - 280 nm)	0.472 µW/cm² = 0.00472 W/m²
non-terrestrial ( 0 nm - 290 nm)	1.4 µW/cm² = 0.014 W/m²
total2 ( 250 nm - 880 nm)	2930 µW/cm² = 29.3 W/m²
UVB (EU) ( 280 nm - 315 nm)	127 µW/cm² = 1.27 W/m²
UVB (US) ( 280 nm - 320 nm)	194 µW/cm² = 1.94 W/m²
UVA+B ( 280 nm - 380 nm)	843 µW/cm² = 8.43 W/m²
Solar UVB ( 290 nm - 315 nm)	126 µW/cm² = 1.26 W/m²
UVA D3 regulating ( 315 nm - 335 nm)	306 µW/cm² = 3.06 W/m²
UVA (EU) ( 315 nm - 380 nm)	717 µW/cm² = 7.17 W/m²
UVA2 (medical definition) ( 320 nm - 340 nm)	310 µW/cm² = 3.1 W/m²
UVA (US) ( 320 nm - 380 nm)	649 µW/cm² = 6.49 W/m²
UVA1 (variant) ( 335 nm - 380 nm)	411 µW/cm² = 4.11 W/m²
UVA1 (medical) ( 340 nm - 400 nm)	370 µW/cm² = 3.7 W/m²
vis. UVA ( 350 nm - 380 nm)	214 µW/cm² = 2.14 W/m²
VIS Rep3 ( 350 nm - 600 nm)	1720 µW/cm² = 17.2 W/m²
VIS Rep4 ( 350 nm - 700 nm)	2180 µW/cm² = 21.8 W/m²
purple ( 380 nm - 420 nm)	183 µW/cm² = 1.83 W/m²
VIS ( 380 nm - 780 nm)	2070 µW/cm² = 20.7 W/m²
VIS2 ( 400 nm - 680 nm)	1880 µW/cm² = 18.8 W/m²
PAR ( 400 nm - 700 nm)	1940 µW/cm² = 19.4 W/m²
tmp ( 400 nm - 1100 nm)	2060 µW/cm² = 20.6 W/m²
blue ( 420 nm - 490 nm)	541 µW/cm² = 5.41 W/m²
green ( 490 nm - 575 nm)	577 µW/cm² = 5.77 W/m²
yellow ( 575 nm - 585 nm)	119 µW/cm² = 1.19 W/m²
orange ( 585 nm - 650 nm)	363 µW/cm² = 3.63 W/m²
red ( 650 nm - 780 nm)	291 µW/cm² = 2.91 W/m²
IRA ( 700 nm - 1400 nm)	119 µW/cm² = 1.19 W/m²
IR2 ( 720 nm - 1100 nm)	74.9 µW/cm² = 0.749 W/m²
IRB ( 1400 nm - 3000 nm)	0 µW/cm² = 0 W/m²

Erythema	10.1 UV-Index
Pyrimidine dimerization of DNA	79.4 µW/cm²
Photoceratitis	15.4 µW/cm²
Photoconjunctivitis	0.789 µW/cm²
DNA Damage	1.94
Vitamin D3	39.8 µW/cm²
Photosynthesis	1340 µW/cm²
Luminosity	5530 lx
Human L-Cone	823 µW/cm²
Human M-Cone	695 µW/cm²
Human S-Cone	471 µW/cm²
CIE X	754 µW/cm²
CIE Y	771 µW/cm²
CIE Z	860 µW/cm²
PAR	9520000 mol photons
Extinction preD3	237 e-3*m²/mol
Extinction Tachysterol	843 e-3*m²/mol
Exctincition PreD3	117000 m²/mol
Extinction Lumisterol	54.3 m²/mol
Exctincition Tachysterol	1190000 m²/mol
Extinction 7DHC	57.9 m²/mol
L-Cone	696 µW/cm²
M-Cone	562 µW/cm²
S-Cone	869 µW/cm²
U-Cone	506 µW/cm²
UVR - ICNIRP 2004	9.56 Rel Biol Eff
Melatonin Supression	613 µW/cm²
Blue Light Hazard	536 µW/cm² (96.9 µW/cm² per 1000 lx)
CIE 174:2006 PreVit D3	43.5 µW/cm²
Lumen Reptil	5900 "pseudo-lx"
Vitamin D3 Degradation	40.2 µW/cm²
Actinic UV	9.44 µW/cm² (17.1 mW/klm)
Exctincition Lumisterol	71800 m²/mol
Exctincition 7DHC	71600 m²/mol
Exctincition Toxisterols	18300 m²/mol

Solarmeter 6.2 (UVB, pre 2010)	237 µW/cm²
Solarmeter 6.5 (UV-Index, pre 2010)	11.6
Leybold UVB	170 µW/cm²
Leybold UVA	452 µW/cm²
Leybold UVC	0.199 µW/cm²
DeltaOhm UVB	391 µW/cm²
DeltaOhm UVC	49.1 µW/cm²
Vernier UVB	63.3 µW/cm²
Vernier UVA	504 µW/cm²
Gröbel UVA	597 µW/cm²
Gröbel UVB	90.6 µW/cm²
Gröbel UVC	0.24 µW/cm²
Luxmeter	5690 lx
Solarmeter 6.4 (D3)	36.2 IU/min
UVX-31	423 µW/cm²
IL UVB	0.102 µW/cm²
IL UVA	517 µW/cm²
Solarmeter 6.5 (UVI, post 2010)	9.06 UV-Index
Solarmeter 6.2 (UVB, post 2010)	156 µW/cm² (Solarmeter Ratio = 17.2)
Solarmeter AlGaN 6.5 UVI sensor	110 UV Index
GenUV 7.1 UV-Index	6.03 UV-Index
Solarmeter 10.0 (Global Power) (manuf.)	25.1 W/m²
Solarmeter 4.0 (UVA)	6.85 mW/cm²
LS122 (manuf.)	0.0109 W/m²
ISM400 (first guess)	15.8 W/m²
LS122 (assumption)	0.768 W/m²
ISM400_new	12.9 W/m²
Solarmeter 10.0 (Global Power) (assumption)	22.2 W/m²