Spectrum #859 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 21,2W
(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 | ( 0.56 ; 0.4 ) | ( 0.74 ; 0.18 ) | ( 0.78 ; 0.16 ; 0.039 ) |
| CCT | 1700 Kelvin | 2000 Kelvin | 1800 Kelvin |
| distance | 0.032 | 0.012 | |
| 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) 613 µW/cm² = 6.13 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) 582 µW/cm² = 5.82 W/m² UVB (EU) ( 280 nm - 315 nm) 0.0739 µW/cm² = 0.000739 W/m² UVB (US) ( 280 nm - 320 nm) 0.109 µW/cm² = 0.00109 W/m² UVA+B ( 280 nm - 380 nm) 0.538 µW/cm² = 0.00538 W/m² Solar UVB ( 290 nm - 315 nm) 0.0739 µW/cm² = 0.000739 W/m² UVA D3 regulating ( 315 nm - 335 nm) 0.156 µW/cm² = 0.00156 W/m² UVA (EU) ( 315 nm - 380 nm) 0.464 µW/cm² = 0.00464 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 0.164 µW/cm² = 0.00164 W/m² UVA (US) ( 320 nm - 380 nm) 0.43 µW/cm² = 0.0043 W/m² UVA1 (variant) ( 335 nm - 380 nm) 0.308 µW/cm² = 0.00308 W/m² UVA1 (medical) ( 340 nm - 400 nm) 0.441 µW/cm² = 0.00441 W/m² vis. UVA ( 350 nm - 380 nm) 0.187 µW/cm² = 0.00187 W/m² VIS Rep3 ( 350 nm - 600 nm) 21 µW/cm² = 0.21 W/m² VIS Rep4 ( 350 nm - 700 nm) 99.4 µW/cm² = 0.994 W/m² purple ( 380 nm - 420 nm) 0.38 µW/cm² = 0.0038 W/m² VIS ( 380 nm - 780 nm) 247 µW/cm² = 2.47 W/m² VIS2 ( 400 nm - 680 nm) 75.4 µW/cm² = 0.754 W/m² PAR ( 400 nm - 700 nm) 99 µW/cm² = 0.99 W/m² tmp ( 400 nm - 1100 nm) 612 µW/cm² = 6.12 W/m² blue ( 420 nm - 490 nm) 1.59 µW/cm² = 0.0159 W/m² green ( 490 nm - 575 nm) 10.9 µW/cm² = 0.109 W/m² yellow ( 575 nm - 585 nm) 2.81 µW/cm² = 0.0281 W/m² orange ( 585 nm - 650 nm) 33 µW/cm² = 0.33 W/m² red ( 650 nm - 780 nm) 198 µW/cm² = 1.98 W/m² IR2 ( 655 nm - 685 nm) 28.7 µW/cm² = 0.287 W/m² IRA ( 700 nm - 1400 nm) 513 µW/cm² = 5.13 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
(5b) Actionspectra
Erythema 0.00525 UV-Index Pyrimidine dimerization of DNA 0.0537 µW/cm² Photoceratitis 0.00811 µW/cm² Photoconjunctivitis 0.000128 µW/cm² DNA Damage 0.000408 Vitamin D3 0.0261 µW/cm² Photosynthesis 78.2 µW/cm² Luminosity 187 lx Human L-Cone 31.3 µW/cm² Human M-Cone 16.5 µW/cm² Human S-Cone 1.25 µW/cm² CIE X 35.7 µW/cm² CIE Y 25.8 µW/cm² CIE Z 2.53 µW/cm² PAR PPFD 5.31 µmol/m²/s Extinction preD3 0.134 e-3*m²/mol Extinction Tachysterol 0.457 e-3*m²/mol Exctincition PreD3 62.4 m²/mol Extinction Lumisterol 0.0214 m²/mol Exctincition Tachysterol 645 m²/mol Extinction 7DHC 0.0123 m²/mol L-Cone 32.9 µW/cm² M-Cone 6.89 µW/cm² S-Cone 1.64 µW/cm² U-Cone 0.804 µW/cm² UVR - ICNIRP 2004 0.00413 Rel Biol Eff Melatonin Supression 2.77 µW/cm² Blue Light Hazard 1.52 µW/cm² (8.15 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 0.0299 µW/cm² Lumen Reptil 124 "pseudo-lx" Vitamin D3 Degradation 0.0226 µW/cm² Actinic UV 0.004 µW/cm² (0.214 mW/klm) Exctincition Lumisterol 30.5 m²/mol Exctincition 7DHC 16.4 m²/mol Exctincition Toxisterols 10 m²/mol UV-Index2 0.00525 UV-Index (285-400nm)
(5c) Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 0.131 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 0.00741 Leybold UVB 0.0978 µW/cm² Leybold UVA 0.32 µW/cm² Leybold UVC 0 µW/cm² DeltaOhm UVB 0.209 µW/cm² DeltaOhm UVC 0.0261 µW/cm² Vernier UVB 0.0413 µW/cm² Vernier UVA 0.303 µW/cm² Gröbel UVA 0.386 µW/cm² Gröbel UVB 0.055 µW/cm² Gröbel UVC 1.94E-5 µW/cm² Luxmeter 160 lx Solarmeter 6.4 (D3) 0.0232 IU/min UVX-31 0.234 µW/cm² IL UVB 5.77E-5 µW/cm² IL UVA 0.366 µW/cm² Solarmeter 6.5 (UVI, post 2010) 0.00606 UV-Index Solarmeter 6.2 (UVB, post 2010) 0.084 µW/cm² (Solarmeter Ratio = 13.9) Solarmeter AlGaN 6.5 UVI sensor 0.0674 UV Index GenUV 7.1 UV-Index 0.00359 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 9.93 W/m² Solarmeter 4.0 (UVA) 0.00585 mW/cm² LS122 (manuf.) 0.821 W/m² ISM400 (first guess) 12.2 W/m² LS122 (assumption) 0.906 W/m² ISM400_new 13.5 W/m² Solarmeter 10.0 (Global Power) (assumption) 10.2 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] | 0.0739 | 0.0127 % |
| UVB (US) (280nm -320nm) [µW/cm] | 0.109 | 0.0187 % |
| Solar UVB (290nm -315nm) [µW/cm] | 0.0739 | 0.0127 % |
| UVA (EU) (315nm -380nm) [µW/cm] | 0.464 | 0.0798 % |
| UVA (US) (320nm -380nm) [µW/cm] | 0.43 | 0.0738 % |
| UVA2 (medical definition) (320nm -340nm) [µW/cm] | 0.164 | 0.0282 % |
| UVA1 (medical) (340nm -400nm) [µW/cm] | 0.441 | 0.0757 % |
| UVA D3 regulating (315nm -335nm) [µW/cm] | 0.156 | 0.0268 % |
| vis. UVA (350nm -380nm) [µW/cm] | 0.187 | 0.0322 % |
| VIS (380nm -780nm) [µW/cm] | 247 | 42.4 % |
| blue (420nm -490nm) [µW/cm] | 1.59 | 0.272 % |
| total2 (250nm -880nm) [µW/cm] | 582 | 100 % |
| UV-Index2 [UV-Index] | 0.00525 | |
| Luminosity [lx] | 187 | |
| Blue Light Hazard [µW/cm²] | 1.52 | 8.15µW/cm/1000lx |
| Solarmeter 6.5 (UVI, post 2010) [UV-Index] | 0.00606 | |
| Solarmeter 6.2 (UVB, post 2010) [µW/cm²] | 0.084 | |
| Actinic UV [µW/cm²] | 0.004 | 5.79 at UVI7.6 |
| Vitamin D3 [µW/cm²] | 0.0261 | 37.8 at UVI7.6 |