Spectrum #837 SW116 (LIH UV Master 400 W daylight symmetric) Edit
Delete(1) Raw Measurement
| Lampid | SW116 |
|---|---|
| Spectrometer | USB2000+ |
| Originator | Sarina Wunderlich |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | - no reflector - |
| Distance | 80 |
| Age | 5 |
created by Sarina Wunderlich, 07.02.2026; last updated by Sarina Wunderlich, 07.02.2026
Description
rough distance measured at workshop
(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 | ( 0.32 ; 0.34 ) | ( 0.34 ; 0.38 ) | ( 0.26 ; 0.25 ; 0.28 ) |
| CCT | 5900 Kelvin | 6300 Kelvin | 5800 Kelvin |
| distance | 0.035 | 0.029 | |
| 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) 14100 µW/cm² = 141 W/m² UVC ( 0 nm - 280 nm) 0.61 µW/cm² = 0.0061 W/m² non-terrestrial ( 0 nm - 290 nm) 2.53 µW/cm² = 0.0253 W/m² total2 ( 250 nm - 880 nm) 14100 µW/cm² = 141 W/m² UVB (EU) ( 280 nm - 315 nm) 34.2 µW/cm² = 0.342 W/m² UVB (US) ( 280 nm - 320 nm) 45.3 µW/cm² = 0.453 W/m² UVA+B ( 280 nm - 380 nm) 1170 µW/cm² = 11.7 W/m² Solar UVB ( 290 nm - 315 nm) 32.3 µW/cm² = 0.323 W/m² UVA D3 regulating ( 315 nm - 335 nm) 85.6 µW/cm² = 0.856 W/m² UVA (EU) ( 315 nm - 380 nm) 1140 µW/cm² = 11.4 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 112 µW/cm² = 1.12 W/m² UVA (US) ( 320 nm - 380 nm) 1120 µW/cm² = 11.2 W/m² UVA1 (variant) ( 335 nm - 380 nm) 1050 µW/cm² = 10.5 W/m² UVA1 (medical) ( 340 nm - 400 nm) 1470 µW/cm² = 14.7 W/m² vis. UVA ( 350 nm - 380 nm) 870 µW/cm² = 8.7 W/m² VIS Rep3 ( 350 nm - 600 nm) 8670 µW/cm² = 86.7 W/m² VIS Rep4 ( 350 nm - 700 nm) 11500 µW/cm² = 115 W/m² purple ( 380 nm - 420 nm) 1260 µW/cm² = 12.6 W/m² VIS ( 380 nm - 780 nm) 11600 µW/cm² = 116 W/m² VIS2 ( 400 nm - 680 nm) 9660 µW/cm² = 96.6 W/m² PAR ( 400 nm - 700 nm) 10200 µW/cm² = 102 W/m² tmp ( 400 nm - 1100 nm) 12500 µW/cm² = 125 W/m² blue ( 420 nm - 490 nm) 2510 µW/cm² = 25.1 W/m² green ( 490 nm - 575 nm) 3110 µW/cm² = 31.1 W/m² yellow ( 575 nm - 585 nm) 346 µW/cm² = 3.46 W/m² orange ( 585 nm - 650 nm) 2120 µW/cm² = 21.2 W/m² red ( 650 nm - 780 nm) 2260 µW/cm² = 22.6 W/m² IR2 ( 655 nm - 685 nm) 821 µW/cm² = 8.21 W/m² IRA ( 700 nm - 1400 nm) 2290 µW/cm² = 22.9 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
(5b) Actionspectra
Erythema 4.86 UV-Index Pyrimidine dimerization of DNA 20.9 µW/cm² Photoceratitis 7.32 µW/cm² Photoconjunctivitis 0.874 µW/cm² DNA Damage 2 Vitamin D3 14.7 µW/cm² Photosynthesis 7070 µW/cm² Luminosity 28200 lx Human L-Cone 4200 µW/cm² Human M-Cone 3540 µW/cm² Human S-Cone 2150 µW/cm² CIE X 3720 µW/cm² CIE Y 3920 µW/cm² CIE Z 3850 µW/cm² PAR PPFD 475 µmol/m²/s Extinction preD3 80.3 e-3*m²/mol Extinction Tachysterol 294 e-3*m²/mol Exctincition PreD3 48900 m²/mol Extinction Lumisterol 38.2 m²/mol Exctincition Tachysterol 447000 m²/mol Extinction 7DHC 48 m²/mol L-Cone 3530 µW/cm² M-Cone 3390 µW/cm² S-Cone 3790 µW/cm² U-Cone 2860 µW/cm² UVR - ICNIRP 2004 5.98 Rel Biol Eff Melatonin Supression 3110 µW/cm² Blue Light Hazard 2590 µW/cm² (92 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 15.6 µW/cm² Lumen Reptil 30700 "pseudo-lx" Vitamin D3 Degradation 12.1 µW/cm² Actinic UV 5.93 µW/cm² (2.1 mW/klm) Exctincition Lumisterol 46200 m²/mol Exctincition 7DHC 55300 m²/mol Exctincition Toxisterols 7410 m²/mol
(5c) Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 67.7 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 4.68 Leybold UVB 42.2 µW/cm² Leybold UVA 861 µW/cm² Leybold UVC 0.159 µW/cm² DeltaOhm UVB 120 µW/cm² DeltaOhm UVC 13.9 µW/cm² Vernier UVB 18.2 µW/cm² Vernier UVA 510 µW/cm² Gröbel UVA 933 µW/cm² Gröbel UVB 27.2 µW/cm² Gröbel UVC 0.348 µW/cm² Luxmeter 28800 lx Solarmeter 6.4 (D3) 14.6 IU/min UVX-31 177 µW/cm² IL UVB 0.0343 µW/cm² IL UVA 1030 µW/cm² Solarmeter 6.5 (UVI, post 2010) 3.18 UV-Index Solarmeter 6.2 (UVB, post 2010) 40.5 µW/cm² (Solarmeter Ratio = 12.7) Solarmeter AlGaN 6.5 UVI sensor 30 UV Index GenUV 7.1 UV-Index 1.83 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 151 W/m² Solarmeter 4.0 (UVA) 16.4 mW/cm² LS122 (manuf.) 3.14 W/m² ISM400 (first guess) 122 W/m² LS122 (assumption) 7.09 W/m² ISM400_new 113 W/m² Solarmeter 10.0 (Global Power) (assumption) 145 W/m²
(5d) Summary of my favourites
| UVC (0nm -280nm) [µW/cm] | 0.61 | 0.00434 % |
| non-terrestrial (0nm -290nm) [µW/cm] | 2.53 | 0.018 % |
| UVB (EU) (280nm -315nm) [µW/cm] | 34.2 | 0.244 % |
| UVB (US) (280nm -320nm) [µW/cm] | 45.3 | 0.322 % |
| Solar UVB (290nm -315nm) [µW/cm] | 32.3 | 0.23 % |
| UVA (EU) (315nm -380nm) [µW/cm] | 1140 | 8.08 % |
| UVA (US) (320nm -380nm) [µW/cm] | 1120 | 8 % |
| UVA2 (medical definition) (320nm -340nm) [µW/cm] | 112 | 0.796 % |
| UVA1 (medical) (340nm -400nm) [µW/cm] | 1470 | 10.5 % |
| UVA D3 regulating (315nm -335nm) [µW/cm] | 85.6 | 0.609 % |
| vis. UVA (350nm -380nm) [µW/cm] | 870 | 6.19 % |
| VIS (380nm -780nm) [µW/cm] | 11600 | 82.6 % |
| blue (420nm -490nm) [µW/cm] | 2510 | 17.9 % |
| total2 (250nm -880nm) [µW/cm] | 14100 | 100 % |
| Erythema [UV-Index] | 4.86 | |
| Luminosity [lx] | 28200 | |
| Blue Light Hazard [µW/cm²] | 2590 | 92µW/cm/1000lx |
| Solarmeter 6.5 (UVI, post 2010) [UV-Index] | 3.18 | |
| Solarmeter 6.2 (UVB, post 2010) [µW/cm²] | 40.5 | |
| Actinic UV [µW/cm²] | 5.93 | 9.28 at UVI7.6 |
| Vitamin D3 [µW/cm²] | 14.7 | 22.9 at UVI7.6 |