Spectrum #860 SW105 (Fauna Lux True Chroma 35W) Edit
Delete(1) Raw Measurement
| Lampid | SW105 |
|---|---|
| Spectrometer | USB2000+ |
| Originator | Sarina Wunderlich |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | - no reflector - |
| Distance | 30 |
| Age | 3,500 |
created by Sarina Wunderlich, 26.09.2026; last updated by , 26.09.2026
Description
(2) Comparison of full spectrum to sunlight
The spectrum is compared to the ASTM spectrum. The measured spectrum is scaled to a lux or UVI value that seems to "make sense" to the database. This can go wrong, depending on the quality and range of the data.
(3) Colorimetry
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 | ( 0.34 ; 0.34 ) | ( 0.47 ; 0.37 ) | ( 0.32 ; 0.32 ; 0.26 ) |
| CCT | 5300 Kelvin | 4000 Kelvin | 4600 Kelvin |
| distance | 0.043 | 0.048 | |
| colour space | 3-D-graph not implemented yet |
(4) Vitamin D3 Analysis
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.
(5) Effective Irradiances
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
(5a) Ranges
total ( 0 nm - 0 nm) 6360 µW/cm² = 63.6 W/m² UVC ( 0 nm - 280 nm) 7.91 µW/cm² = 0.0791 W/m² non-terrestrial ( 0 nm - 290 nm) 10.9 µW/cm² = 0.109 W/m² total2 ( 250 nm - 880 nm) 6360 µW/cm² = 63.6 W/m² UVB (EU) ( 280 nm - 315 nm) 8.62 µW/cm² = 0.0862 W/m² UVB (US) ( 280 nm - 320 nm) 9.51 µW/cm² = 0.0951 W/m² UVA+B ( 280 nm - 380 nm) 129 µW/cm² = 1.29 W/m² Solar UVB ( 290 nm - 315 nm) 5.58 µW/cm² = 0.0558 W/m² UVA D3 regulating ( 315 nm - 335 nm) 3.19 µW/cm² = 0.0319 W/m² UVA (EU) ( 315 nm - 380 nm) 120 µW/cm² = 1.2 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 3.01 µW/cm² = 0.0301 W/m² UVA (US) ( 320 nm - 380 nm) 120 µW/cm² = 1.2 W/m² UVA1 (variant) ( 335 nm - 380 nm) 117 µW/cm² = 1.17 W/m² UVA1 (medical) ( 340 nm - 400 nm) 228 µW/cm² = 2.28 W/m² vis. UVA ( 350 nm - 380 nm) 115 µW/cm² = 1.15 W/m² VIS Rep3 ( 350 nm - 600 nm) 4190 µW/cm² = 41.9 W/m² VIS Rep4 ( 350 nm - 700 nm) 6040 µW/cm² = 60.4 W/m² purple ( 380 nm - 420 nm) 376 µW/cm² = 3.76 W/m² VIS ( 380 nm - 780 nm) 6240 µW/cm² = 62.4 W/m² VIS2 ( 400 nm - 680 nm) 5580 µW/cm² = 55.8 W/m² PAR ( 400 nm - 700 nm) 5820 µW/cm² = 58.2 W/m² blue ( 420 nm - 490 nm) 1400 µW/cm² = 14 W/m² green ( 490 nm - 575 nm) 1770 µW/cm² = 17.7 W/m² yellow ( 575 nm - 585 nm) 211 µW/cm² = 2.11 W/m² orange ( 585 nm - 650 nm) 1410 µW/cm² = 14.1 W/m² tmp ( 600 nm - 1000 nm) 2150 µW/cm² = 21.5 W/m² red ( 650 nm - 780 nm) 1060 µW/cm² = 10.6 W/m² IR2 ( 655 nm - 685 nm) 492 µW/cm² = 4.92 W/m² IRA ( 700 nm - 1400 nm) 292 µW/cm² = 2.92 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
(5b) Actionspectra
Erythema 5.61 UV-Index Pyrimidine dimerization of DNA 3.81 µW/cm² Photoceratitis 6.48 µW/cm² Photoconjunctivitis 6.98 µW/cm² DNA Damage 8.58 Vitamin D3 7.65 µW/cm² Photosynthesis 4050 µW/cm² Luminosity 16300 lx Human L-Cone 2450 µW/cm² Human M-Cone 2000 µW/cm² Human S-Cone 1100 µW/cm² CIE X 2220 µW/cm² CIE Y 2260 µW/cm² CIE Z 2090 µW/cm² PAR PPFD 274 µmol/m²/s Extinction preD3 94.6 e-3*m²/mol Extinction Tachysterol 255 e-3*m²/mol Exctincition PreD3 83800 m²/mol Extinction Lumisterol 86.4 m²/mol Exctincition Tachysterol 319000 m²/mol Extinction 7DHC 107 m²/mol L-Cone 2110 µW/cm² M-Cone 2160 µW/cm² S-Cone 1710 µW/cm² U-Cone 700 µW/cm² UVR - ICNIRP 2004 10.6 Rel Biol Eff Melatonin Supression 1740 µW/cm² Blue Light Hazard 1240 µW/cm² (76 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 7.64 µW/cm² Lumen Reptil 16000 "pseudo-lx" Vitamin D3 Degradation 6.55 µW/cm² Actinic UV 10.5 µW/cm² (6.44 mW/klm) Exctincition Lumisterol 95700 m²/mol Exctincition 7DHC 114000 m²/mol Exctincition Toxisterols 21700 m²/mol UV-Index2 1.78 UV-Index (285-400nm)
(5c) Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 23.1 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 3.15 Leybold UVB 6.23 µW/cm² Leybold UVA 79.2 µW/cm² Leybold UVC 5.05 µW/cm² DeltaOhm UVB 9.38 µW/cm² DeltaOhm UVC 7.66 µW/cm² Vernier UVB 5.33 µW/cm² Vernier UVA 35.1 µW/cm² Gröbel UVA 85.6 µW/cm² Gröbel UVB 9.37 µW/cm² Gröbel UVC 5.94 µW/cm² Luxmeter 16400 lx Solarmeter 6.4 (D3) 9.83 IU/min UVX-31 11.6 µW/cm² IL UVB 0.00903 µW/cm² IL UVA 109 µW/cm² Solarmeter 6.5 (UVI, post 2010) 2.04 UV-Index Solarmeter 6.2 (UVB, post 2010) 7.94 µW/cm² (Solarmeter Ratio = 3.89) Solarmeter AlGaN 6.5 UVI sensor 9.73 UV Index GenUV 7.1 UV-Index 0.735 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 67.8 W/m² Solarmeter 4.0 (UVA) 2.36 mW/cm² LS122 (manuf.) -0.118 W/m² ISM400 (first guess) 49.5 W/m² LS122 (assumption) 2.42 W/m² ISM400_new 40.9 W/m² Solarmeter 10.0 (Global Power) (assumption) 65.9 W/m²
(5d) Summary of my favourites
| UVC (0nm -280nm) [µW/cm] | 7.91 | 0.124 % |
| non-terrestrial (0nm -290nm) [µW/cm] | 10.9 | 0.172 % |
| UVB (EU) (280nm -315nm) [µW/cm] | 8.62 | 0.136 % |
| UVB (US) (280nm -320nm) [µW/cm] | 9.51 | 0.149 % |
| Solar UVB (290nm -315nm) [µW/cm] | 5.58 | 0.0877 % |
| UVA (EU) (315nm -380nm) [µW/cm] | 120 | 1.89 % |
| UVA (US) (320nm -380nm) [µW/cm] | 120 | 1.88 % |
| UVA2 (medical definition) (320nm -340nm) [µW/cm] | 3.01 | 0.0473 % |
| UVA1 (medical) (340nm -400nm) [µW/cm] | 228 | 3.58 % |
| UVA D3 regulating (315nm -335nm) [µW/cm] | 3.19 | 0.0502 % |
| vis. UVA (350nm -380nm) [µW/cm] | 115 | 1.81 % |
| VIS (380nm -780nm) [µW/cm] | 6240 | 98 % |
| blue (420nm -490nm) [µW/cm] | 1400 | 22.1 % |
| total2 (250nm -880nm) [µW/cm] | 6360 | 100 % |
| UV-Index2 [UV-Index] | 1.78 | |
| Luminosity [lx] | 16300 | |
| Blue Light Hazard [µW/cm²] | 1240 | 76µW/cm/1000lx |
| Solarmeter 6.5 (UVI, post 2010) [UV-Index] | 2.04 | |
| Solarmeter 6.2 (UVB, post 2010) [µW/cm²] | 7.94 | |
| Actinic UV [µW/cm²] | 10.5 | 44.8 at UVI7.6 |
| Vitamin D3 [µW/cm²] | 7.65 | 32.6 at UVI7.6 |