Spectrum 822: SW102 Edit
DeleteMeasurement
| Brand |
X-Reptile http://www.x-reptile.ch/ |
|---|---|
| Lamp Product |
UV-MH 35 W |
| Lamp ID |
SW102 (03/2025) donated for test by Esther Laue |
| Spectrometer | USB2000+ |
| Ballast | 35W EVG |
| Reflector | |
| Distance | 40 cm |
| Age | 1 hours |
| Originator (measurement) | Sarina Wunderlich |
Database entry created:
Sarina Wunderlich
3/May/2025 ; updated:
Sarina Wunderlich
3/May/2025
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 (id 1).
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 ; 0.38 ) | ( 0.3 ; 0.35 ) | ( 0.26 ; 0.22 ; 0.26 ) |
| CCT | 5900 Kelvin | 7800 Kelvin | 6000 Kelvin |
| distance | 0.0083 | 0.045 | |
| colour space | 3-D-graph not implemented yet |
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 two solarmeters 6.2 (UVB) and 6.5 (UV index) readings has proven a useful and very simply number to acess the spectral shape in the vitamin-d3-active region.
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
Ranges
total ( 0 nm - 0 nm) 9140 µW/cm² = 91.4 W/m² UVC ( 0 nm - 280 nm) 3.18 µW/cm² = 0.0318 W/m² non-terrestrial ( 0 nm - 290 nm) 5.6 µW/cm² = 0.056 W/m² total2 ( 250 nm - 880 nm) 9100 µW/cm² = 91 W/m² UVB (EU) ( 280 nm - 315 nm) 61.6 µW/cm² = 0.616 W/m² UVB (US) ( 280 nm - 320 nm) 86.7 µW/cm² = 0.867 W/m² UVA+B ( 280 nm - 380 nm) 1050 µW/cm² = 10.5 W/m² Solar UVB ( 290 nm - 315 nm) 59.2 µW/cm² = 0.592 W/m² UVA D3 regulating ( 315 nm - 335 nm) 141 µW/cm² = 1.41 W/m² UVA (EU) ( 315 nm - 380 nm) 989 µW/cm² = 9.89 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 148 µW/cm² = 1.48 W/m² UVA (US) ( 320 nm - 380 nm) 964 µW/cm² = 9.64 W/m² UVA1 (variant) ( 335 nm - 380 nm) 849 µW/cm² = 8.49 W/m² UVA1 (medical) ( 340 nm - 400 nm) 1220 µW/cm² = 12.2 W/m² vis. UVA ( 350 nm - 380 nm) 742 µW/cm² = 7.42 W/m² VIS Rep3 ( 350 nm - 600 nm) 6530 µW/cm² = 65.3 W/m² VIS Rep4 ( 350 nm - 700 nm) 7470 µW/cm² = 74.7 W/m² purple ( 380 nm - 420 nm) 1090 µW/cm² = 10.9 W/m² VIS ( 380 nm - 780 nm) 7080 µW/cm² = 70.8 W/m² VIS2 ( 400 nm - 680 nm) 6200 µW/cm² = 62 W/m² PAR ( 400 nm - 700 nm) 6320 µW/cm² = 63.2 W/m² tmp ( 400 nm - 1100 nm) 7680 µW/cm² = 76.8 W/m² blue ( 420 nm - 490 nm) 1500 µW/cm² = 15 W/m² green ( 490 nm - 575 nm) 2380 µW/cm² = 23.8 W/m² yellow ( 575 nm - 585 nm) 179 µW/cm² = 1.79 W/m² orange ( 585 nm - 650 nm) 1260 µW/cm² = 12.6 W/m² red ( 650 nm - 780 nm) 674 µW/cm² = 6.74 W/m² IRA ( 700 nm - 1400 nm) 1350 µW/cm² = 13.5 W/m² IR2 ( 720 nm - 1100 nm) 1280 µW/cm² = 12.8 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 7.73 UV-Index Pyrimidine dimerization of DNA 35.2 µW/cm² Photoceratitis 10.9 µW/cm² Photoconjunctivitis 3.13 µW/cm² DNA Damage 4.63 Vitamin D3 22.7 µW/cm² Photosynthesis 4160 µW/cm² Luminosity 20700 lx Human L-Cone 3050 µW/cm² Human M-Cone 2670 µW/cm² Human S-Cone 1330 µW/cm² CIE X 2470 µW/cm² CIE Y 2900 µW/cm² CIE Z 2330 µW/cm² PAR PPFD 299 µmol/m²/s Extinction preD3 147 e-3*m²/mol Extinction Tachysterol 498 e-3*m²/mol Exctincition PreD3 90500 m²/mol Extinction Lumisterol 67 m²/mol Exctincition Tachysterol 702000 m²/mol Extinction 7DHC 80.1 m²/mol L-Cone 2500 µW/cm² M-Cone 2120 µW/cm² S-Cone 2480 µW/cm² U-Cone 2520 µW/cm² UVR - ICNIRP 2004 9.95 Rel Biol Eff Melatonin Supression 1930 µW/cm² Blue Light Hazard 1650 µW/cm² (79.5 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 23.9 µW/cm² Lumen Reptil 21600 "pseudo-lx" Vitamin D3 Degradation 20.6 µW/cm² Actinic UV 9.82 µW/cm² (4.74 mW/klm) Exctincition Lumisterol 79700 m²/mol Exctincition 7DHC 91300 m²/mol Exctincition Toxisterols 16900 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 116 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 7.08 Leybold UVB 75.8 µW/cm² Leybold UVA 717 µW/cm² Leybold UVC 1.91 µW/cm² DeltaOhm UVB 180 µW/cm² DeltaOhm UVC 25.3 µW/cm² Vernier UVB 28.6 µW/cm² Vernier UVA 459 µW/cm² Gröbel UVA 801 µW/cm² Gröbel UVB 44.3 µW/cm² Gröbel UVC 2.33 µW/cm² Luxmeter 21700 lx Solarmeter 6.4 (D3) 22.1 IU/min UVX-31 224 µW/cm² IL UVB 0.0517 µW/cm² IL UVA 865 µW/cm² Solarmeter 6.5 (UVI, post 2010) 5.09 UV-Index Solarmeter 6.2 (UVB, post 2010) 71.1 µW/cm² (Solarmeter Ratio = 14) Solarmeter AlGaN 6.5 UVI sensor 52 UV Index GenUV 7.1 UV-Index 3.06 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 92.4 W/m² Solarmeter 4.0 (UVA) 14.3 mW/cm² LS122 (manuf.) 2.56 W/m² ISM400 (first guess) 71.3 W/m² LS122 (assumption) 4.48 W/m² ISM400_new 65.6 W/m² Solarmeter 10.0 (Global Power) (assumption) 87.1 W/m²