19Area (m²):1019 1.1946E-5
Illuminance (lux):1021 4.2278E3
Luminance (candela per m²):1023 4.2278E3
Luminous Flux (lumen):1020 5.0506E-2
Luminous intensity (candela):1022 5.0506E-2
Observer:1017 Photopic
Solid Angle (steradians):1018 1.0
Source:1016 FLMT09760
Device Source:1001 FLMT09760
Integration Begin:1002 400.00
Integration End:1003 700.00
Method:1004 Uses Simpson's Rule for integration.
Moles of Photons:1013 7.8402E-12
PAR uMoles/m²/sec:1015 5.1637E1
PAR uMoles:1014 7.8402E-6
Photons/cm²/sec:1011 3.1096E15
Total Photons:1012 4.7215E12
dBm:1009 -8.6027E0
eV:1010 1.0944E13
uJoule/cm²:1007 1.4678E1
uJoule:1005 1.7534E0
uWatt/cm²:1008 1.1548E3
uWatt:1006 1.3795E2
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 |
( 0.34 ; 0.39 ) |
( 0.17 ; 0.4 ) |
( 0.32 ; 0.12
; 0.27 ) |
| CCT |
5300 Kelvin |
27000 Kelvin |
5500 Kelvin |
| distance |
|
0.091 |
0.16 |
| 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).
The numbers in the following tables can also be used to estimate certain (effective) irradiances from radiomer readings. Example: If the database lists
- range: UVB (US) = 13.8 µW/cm²
- radiometer: Solarmeter 6.2 = 19.6 µW/cm²
then any Solarmeter 6.2 reading multiplied with 0.7 (0.7=13.8/19.6) is an estimate of UVB irradiance for this specific lamp. If you do so, always make sure, that the calculated (effective) irradiance is valid. The calculated value is not valid, if the lamp's spectrum is not measured in the relevant range.