Spectrum #856 SW132 (Philips Halogen IR-100C-PAR 100W) Edit
Delete(1) Raw Measurement
| Lampid | SW132 |
|---|---|
| Spectrometer | USB2000+ |
| Originator | Sarina Wunderlich |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | - no reflector - |
| Distance | 20 |
| Age | 100 |
created by Sarina Wunderlich, 22.09.2026; last updated by , 22.09.2026
Description
dimmed to 82,2W
(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 | ( 0.48 ; 0.42 ) | ( 0.67 ; 0.25 ) | ( 0.62 ; 0.26 ; 0.097 ) |
| CCT | 2400 Kelvin | 2400 Kelvin | 2400 Kelvin |
| distance | 0.00087 | 0.0021 | |
| 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) 16600 µW/cm² = 166 W/m² UVC ( 0 nm - 280 nm) 0 µW/cm² = 0 W/m² non-terrestrial ( 0 nm - 290 nm) 0 µW/cm² = 0 W/m² total2 ( 250 nm - 880 nm) 16100 µW/cm² = 161 W/m² UVB (EU) ( 280 nm - 315 nm) 0.265 µW/cm² = 0.00265 W/m² UVB (US) ( 280 nm - 320 nm) 0.4 µW/cm² = 0.004 W/m² UVA+B ( 280 nm - 380 nm) 17.6 µW/cm² = 0.176 W/m² Solar UVB ( 290 nm - 315 nm) 0.265 µW/cm² = 0.00265 W/m² UVA D3 regulating ( 315 nm - 335 nm) 1.11 µW/cm² = 0.0111 W/m² UVA (EU) ( 315 nm - 380 nm) 17.3 µW/cm² = 0.173 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 1.58 µW/cm² = 0.0158 W/m² UVA (US) ( 320 nm - 380 nm) 17.2 µW/cm² = 0.172 W/m² UVA1 (variant) ( 335 nm - 380 nm) 16.2 µW/cm² = 0.162 W/m² UVA1 (medical) ( 340 nm - 400 nm) 35.2 µW/cm² = 0.352 W/m² vis. UVA ( 350 nm - 380 nm) 13.7 µW/cm² = 0.137 W/m² VIS Rep3 ( 350 nm - 600 nm) 1990 µW/cm² = 19.9 W/m² VIS Rep4 ( 350 nm - 700 nm) 5400 µW/cm² = 54 W/m² purple ( 380 nm - 420 nm) 52.8 µW/cm² = 0.528 W/m² VIS ( 380 nm - 780 nm) 9520 µW/cm² = 95.2 W/m² VIS2 ( 400 nm - 680 nm) 4510 µW/cm² = 45.1 W/m² PAR ( 400 nm - 700 nm) 5360 µW/cm² = 53.6 W/m² tmp ( 400 nm - 1100 nm) 16600 µW/cm² = 166 W/m² blue ( 420 nm - 490 nm) 300 µW/cm² = 3 W/m² green ( 490 nm - 575 nm) 1080 µW/cm² = 10.8 W/m² yellow ( 575 nm - 585 nm) 206 µW/cm² = 2.06 W/m² orange ( 585 nm - 650 nm) 1780 µW/cm² = 17.8 W/m² red ( 650 nm - 780 nm) 6090 µW/cm² = 60.9 W/m² IR2 ( 655 nm - 685 nm) 1150 µW/cm² = 11.5 W/m² IRA ( 700 nm - 1400 nm) 11200 µW/cm² = 112 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
(5b) Actionspectra
Erythema 0.0277 UV-Index Pyrimidine dimerization of DNA 0.208 µW/cm² Photoceratitis 0.0343 µW/cm² Photoconjunctivitis 0.000593 µW/cm² DNA Damage 0.00209 Vitamin D3 0.11 µW/cm² Photosynthesis 3920 µW/cm² Luminosity 13400 lx Human L-Cone 2140 µW/cm² Human M-Cone 1390 µW/cm² Human S-Cone 232 µW/cm² CIE X 2170 µW/cm² CIE Y 1860 µW/cm² CIE Z 457 µW/cm² PAR PPFD 276 µmol/m²/s Extinction preD3 0.541 e-3*m²/mol Extinction Tachysterol 1.89 e-3*m²/mol Exctincition PreD3 301 m²/mol Extinction Lumisterol 0.103 m²/mol Exctincition Tachysterol 3370 m²/mol Extinction 7DHC 0.0671 m²/mol L-Cone 2080 µW/cm² M-Cone 865 µW/cm² S-Cone 327 µW/cm² U-Cone 96 µW/cm² UVR - ICNIRP 2004 0.0235 Rel Biol Eff Melatonin Supression 442 µW/cm² Blue Light Hazard 265 µW/cm² (19.8 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 0.123 µW/cm² Lumen Reptil 9360 "pseudo-lx" Vitamin D3 Degradation 0.0928 µW/cm² Actinic UV 0.0226 µW/cm² (0.0169 mW/klm) Exctincition Lumisterol 139 m²/mol Exctincition 7DHC 89.8 m²/mol Exctincition Toxisterols 68.5 m²/mol UV-Index2 0.0277 UV-Index (285-400nm)
(5c) Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 0.657 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 0.0326 Leybold UVB 0.389 µW/cm² Leybold UVA 14 µW/cm² Leybold UVC 0 µW/cm² DeltaOhm UVB 1.41 µW/cm² DeltaOhm UVC 0.123 µW/cm² Vernier UVB 0.142 µW/cm² Vernier UVA 7.18 µW/cm² Gröbel UVA 13.9 µW/cm² Gröbel UVB 0.235 µW/cm² Gröbel UVC 0.000151 µW/cm² Luxmeter 12500 lx Solarmeter 6.4 (D3) 0.102 IU/min UVX-31 2.11 µW/cm² IL UVB 0.000342 µW/cm² IL UVA 16.7 µW/cm² Solarmeter 6.5 (UVI, post 2010) 0.0251 UV-Index Solarmeter 6.2 (UVB, post 2010) 0.376 µW/cm² (Solarmeter Ratio = 15) Solarmeter AlGaN 6.5 UVI sensor 0.25 UV Index GenUV 7.1 UV-Index 0.0189 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 253 W/m² Solarmeter 4.0 (UVA) 0.36 mW/cm² LS122 (manuf.) 14.7 W/m² ISM400 (first guess) 293 W/m² LS122 (assumption) 19.7 W/m² ISM400_new 312 W/m² Solarmeter 10.0 (Global Power) (assumption) 261 W/m²
(5d) Summary of my favourites
| UVC (0nm -280nm) [µW/cm] | 0 | 0 % |
| non-terrestrial (0nm -290nm) [µW/cm] | 0 | 0 % |
| UVB (EU) (280nm -315nm) [µW/cm] | 0.265 | 0.00165 % |
| UVB (US) (280nm -320nm) [µW/cm] | 0.4 | 0.00249 % |
| Solar UVB (290nm -315nm) [µW/cm] | 0.265 | 0.00165 % |
| UVA (EU) (315nm -380nm) [µW/cm] | 17.3 | 0.108 % |
| UVA (US) (320nm -380nm) [µW/cm] | 17.2 | 0.107 % |
| UVA2 (medical definition) (320nm -340nm) [µW/cm] | 1.58 | 0.00982 % |
| UVA1 (medical) (340nm -400nm) [µW/cm] | 35.2 | 0.219 % |
| UVA D3 regulating (315nm -335nm) [µW/cm] | 1.11 | 0.00688 % |
| vis. UVA (350nm -380nm) [µW/cm] | 13.7 | 0.085 % |
| VIS (380nm -780nm) [µW/cm] | 9520 | 59.2 % |
| blue (420nm -490nm) [µW/cm] | 300 | 1.87 % |
| total2 (250nm -880nm) [µW/cm] | 16100 | 100 % |
| UV-Index2 [UV-Index] | 0.0277 | |
| Luminosity [lx] | 13400 | |
| Blue Light Hazard [µW/cm²] | 265 | 19.8µW/cm/1000lx |
| Solarmeter 6.5 (UVI, post 2010) [UV-Index] | 0.0251 | |
| Solarmeter 6.2 (UVB, post 2010) [µW/cm²] | 0.376 | |
| Actinic UV [µW/cm²] | 0.0226 | 6.21 at UVI7.6 |
| Vitamin D3 [µW/cm²] | 0.11 | 30.2 at UVI7.6 |