Spectrum #858 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 49,6W
(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 | ( 0.51 ; 0.41 ) | ( 0.71 ; 0.23 ) | ( 0.68 ; 0.23 ; 0.073 ) |
| CCT | 2200 Kelvin | 2200 Kelvin | 2200 Kelvin |
| distance | 0.0039 | 0.0022 | |
| 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) 6140 µW/cm² = 61.4 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) 5910 µW/cm² = 59.1 W/m² UVB (EU) ( 280 nm - 315 nm) 0.272 µW/cm² = 0.00272 W/m² UVB (US) ( 280 nm - 320 nm) 0.378 µW/cm² = 0.00378 W/m² UVA+B ( 280 nm - 380 nm) 4.51 µW/cm² = 0.0451 W/m² Solar UVB ( 290 nm - 315 nm) 0.272 µW/cm² = 0.00272 W/m² UVA D3 regulating ( 315 nm - 335 nm) 0.533 µW/cm² = 0.00533 W/m² UVA (EU) ( 315 nm - 380 nm) 4.24 µW/cm² = 0.0424 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 0.618 µW/cm² = 0.00618 W/m² UVA (US) ( 320 nm - 380 nm) 4.13 µW/cm² = 0.0413 W/m² UVA1 (variant) ( 335 nm - 380 nm) 3.71 µW/cm² = 0.0371 W/m² UVA1 (medical) ( 340 nm - 400 nm) 7.23 µW/cm² = 0.0723 W/m² vis. UVA ( 350 nm - 380 nm) 2.95 µW/cm² = 0.0295 W/m² VIS Rep3 ( 350 nm - 600 nm) 512 µW/cm² = 5.12 W/m² VIS Rep4 ( 350 nm - 700 nm) 1630 µW/cm² = 16.3 W/m² purple ( 380 nm - 420 nm) 9.8 µW/cm² = 0.098 W/m² VIS ( 380 nm - 780 nm) 3180 µW/cm² = 31.8 W/m² VIS2 ( 400 nm - 680 nm) 1330 µW/cm² = 13.3 W/m² PAR ( 400 nm - 700 nm) 1630 µW/cm² = 16.3 W/m² tmp ( 400 nm - 1100 nm) 6130 µW/cm² = 61.3 W/m² blue ( 420 nm - 490 nm) 62.9 µW/cm² = 0.629 W/m² green ( 490 nm - 575 nm) 279 µW/cm² = 2.79 W/m² yellow ( 575 nm - 585 nm) 58.8 µW/cm² = 0.588 W/m² orange ( 585 nm - 650 nm) 551 µW/cm² = 5.51 W/m² red ( 650 nm - 780 nm) 2220 µW/cm² = 22.2 W/m² IR2 ( 655 nm - 685 nm) 388 µW/cm² = 3.88 W/m² IRA ( 700 nm - 1400 nm) 4510 µW/cm² = 45.1 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
(5b) Actionspectra
Erythema 0.0224 UV-Index Pyrimidine dimerization of DNA 0.198 µW/cm² Photoceratitis 0.0329 µW/cm² Photoconjunctivitis 0.000554 µW/cm² DNA Damage 0.00186 Vitamin D3 0.105 µW/cm² Photosynthesis 1210 µW/cm² Luminosity 3780 lx Human L-Cone 614 µW/cm² Human M-Cone 374 µW/cm² Human S-Cone 48.5 µW/cm² CIE X 643 µW/cm² CIE Y 524 µW/cm² CIE Z 96.4 µW/cm² PAR PPFD 84.9 µmol/m²/s Extinction preD3 0.497 e-3*m²/mol Extinction Tachysterol 1.69 e-3*m²/mol Exctincition PreD3 237 m²/mol Extinction Lumisterol 0.0938 m²/mol Exctincition Tachysterol 2450 m²/mol Extinction 7DHC 0.0589 m²/mol L-Cone 609 µW/cm² M-Cone 206 µW/cm² S-Cone 65.9 µW/cm² U-Cone 18.4 µW/cm² UVR - ICNIRP 2004 0.019 Rel Biol Eff Melatonin Supression 96.9 µW/cm² Blue Light Hazard 55.7 µW/cm² (14.7 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 0.12 µW/cm² Lumen Reptil 2560 "pseudo-lx" Vitamin D3 Degradation 0.0813 µW/cm² Actinic UV 0.0182 µW/cm² (0.0481 mW/klm) Exctincition Lumisterol 128 m²/mol Exctincition 7DHC 78.4 m²/mol Exctincition Toxisterols 39.1 m²/mol UV-Index2 0.0224 UV-Index (285-400nm)
(5c) Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 0.478 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 0.0298 Leybold UVB 0.345 µW/cm² Leybold UVA 3.28 µW/cm² Leybold UVC 0 µW/cm² DeltaOhm UVB 0.761 µW/cm² DeltaOhm UVC 0.0898 µW/cm² Vernier UVB 0.143 µW/cm² Vernier UVA 2 µW/cm² Gröbel UVA 3.44 µW/cm² Gröbel UVB 0.206 µW/cm² Gröbel UVC 0.000131 µW/cm² Luxmeter 3440 lx Solarmeter 6.4 (D3) 0.0933 IU/min UVX-31 0.959 µW/cm² IL UVB 0.000219 µW/cm² IL UVA 3.9 µW/cm² Solarmeter 6.5 (UVI, post 2010) 0.0237 UV-Index Solarmeter 6.2 (UVB, post 2010) 0.288 µW/cm² (Solarmeter Ratio = 12.1) Solarmeter AlGaN 6.5 UVI sensor 0.248 UV Index GenUV 7.1 UV-Index 0.0139 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 95.9 W/m² Solarmeter 4.0 (UVA) 0.0771 mW/cm² LS122 (manuf.) 6.31 W/m² ISM400 (first guess) 114 W/m² LS122 (assumption) 7.87 W/m² ISM400_new 122 W/m² Solarmeter 10.0 (Global Power) (assumption) 98.9 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] | 0.272 | 0.00459 % |
| UVB (US) (280nm -320nm) [µW/cm] | 0.378 | 0.0064 % |
| Solar UVB (290nm -315nm) [µW/cm] | 0.272 | 0.00459 % |
| UVA (EU) (315nm -380nm) [µW/cm] | 4.24 | 0.0717 % |
| UVA (US) (320nm -380nm) [µW/cm] | 4.13 | 0.0699 % |
| UVA2 (medical definition) (320nm -340nm) [µW/cm] | 0.618 | 0.0104 % |
| UVA1 (medical) (340nm -400nm) [µW/cm] | 7.23 | 0.122 % |
| UVA D3 regulating (315nm -335nm) [µW/cm] | 0.533 | 0.00901 % |
| vis. UVA (350nm -380nm) [µW/cm] | 2.95 | 0.0499 % |
| VIS (380nm -780nm) [µW/cm] | 3180 | 53.8 % |
| blue (420nm -490nm) [µW/cm] | 62.9 | 1.06 % |
| total2 (250nm -880nm) [µW/cm] | 5910 | 100 % |
| UV-Index2 [UV-Index] | 0.0224 | |
| Luminosity [lx] | 3780 | |
| Blue Light Hazard [µW/cm²] | 55.7 | 14.7µW/cm/1000lx |
| Solarmeter 6.5 (UVI, post 2010) [UV-Index] | 0.0237 | |
| Solarmeter 6.2 (UVB, post 2010) [µW/cm²] | 0.288 | |
| Actinic UV [µW/cm²] | 0.0182 | 6.17 at UVI7.6 |
| Vitamin D3 [µW/cm²] | 0.105 | 35.7 at UVI7.6 |