spectrum taken off center because of saturation
Spectrum 821: SW100 Edit
DeleteMeasurement
| Brand |
X-Reptile http://www.x-reptile.ch/ |
|---|---|
| Lamp Product |
UV-MH 70 W Flood |
| Lamp ID |
SW100 (03/2025) from Esther Laue |
| Spectrometer | USB2000+ |
| Ballast | 70W EVG |
| Reflector | |
| Distance | 50 cm |
| Age | 11 hours |
| Originator (measurement) | Sarina Wunderlich |
Database entry created:
Sarina Wunderlich
1/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 ; 0.36 ) | ( 0.28 ; 0.35 ) | ( 0.24 ; 0.21 ; 0.26 ) |
| CCT | 6200 Kelvin | 8600 Kelvin | 6600 Kelvin |
| distance | 0.011 | 0.044 | |
| 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) 16700 µW/cm² = 167 W/m² UVC ( 0 nm - 280 nm) 2.2 µW/cm² = 0.022 W/m² non-terrestrial ( 0 nm - 290 nm) 5.94 µW/cm² = 0.0594 W/m² total2 ( 250 nm - 880 nm) 16700 µW/cm² = 167 W/m² UVB (EU) ( 280 nm - 315 nm) 141 µW/cm² = 1.41 W/m² UVB (US) ( 280 nm - 320 nm) 182 µW/cm² = 1.82 W/m² UVA+B ( 280 nm - 380 nm) 2110 µW/cm² = 21.1 W/m² Solar UVB ( 290 nm - 315 nm) 137 µW/cm² = 1.37 W/m² UVA D3 regulating ( 315 nm - 335 nm) 238 µW/cm² = 2.38 W/m² UVA (EU) ( 315 nm - 380 nm) 1970 µW/cm² = 19.7 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 259 µW/cm² = 2.59 W/m² UVA (US) ( 320 nm - 380 nm) 1930 µW/cm² = 19.3 W/m² UVA1 (variant) ( 335 nm - 380 nm) 1730 µW/cm² = 17.3 W/m² UVA1 (medical) ( 340 nm - 400 nm) 2500 µW/cm² = 25 W/m² vis. UVA ( 350 nm - 380 nm) 1510 µW/cm² = 15.1 W/m² VIS Rep3 ( 350 nm - 600 nm) 12100 µW/cm² = 121 W/m² VIS Rep4 ( 350 nm - 700 nm) 13800 µW/cm² = 138 W/m² purple ( 380 nm - 420 nm) 2120 µW/cm² = 21.2 W/m² VIS ( 380 nm - 780 nm) 12900 µW/cm² = 129 W/m² VIS2 ( 400 nm - 680 nm) 11200 µW/cm² = 112 W/m² PAR ( 400 nm - 700 nm) 11500 µW/cm² = 115 W/m² tmp ( 400 nm - 1100 nm) 13800 µW/cm² = 138 W/m² blue ( 420 nm - 490 nm) 2870 µW/cm² = 28.7 W/m² green ( 490 nm - 575 nm) 4140 µW/cm² = 41.4 W/m² yellow ( 575 nm - 585 nm) 375 µW/cm² = 3.75 W/m² orange ( 585 nm - 650 nm) 2150 µW/cm² = 21.5 W/m² red ( 650 nm - 780 nm) 1230 µW/cm² = 12.3 W/m² IRA ( 700 nm - 1400 nm) 2310 µW/cm² = 23.1 W/m² IR2 ( 720 nm - 1100 nm) 2190 µW/cm² = 21.9 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 16.2 UV-Index Pyrimidine dimerization of DNA 80.1 µW/cm² Photoceratitis 24.1 µW/cm² Photoconjunctivitis 3.09 µW/cm² DNA Damage 5.73 Vitamin D3 54.1 µW/cm² Photosynthesis 7650 µW/cm² Luminosity 36300 lx Human L-Cone 5330 µW/cm² Human M-Cone 4690 µW/cm² Human S-Cone 2560 µW/cm² CIE X 4390 µW/cm² CIE Y 5080 µW/cm² CIE Z 4470 µW/cm² PAR PPFD 543 µmol/m²/s Extinction preD3 284 e-3*m²/mol Extinction Tachysterol 1000 e-3*m²/mol Exctincition PreD3 159000 m²/mol Extinction Lumisterol 114 m²/mol Exctincition Tachysterol 1400000 m²/mol Extinction 7DHC 134 m²/mol L-Cone 4380 µW/cm² M-Cone 3870 µW/cm² S-Cone 4750 µW/cm² U-Cone 5040 µW/cm² UVR - ICNIRP 2004 18.6 Rel Biol Eff Melatonin Supression 3660 µW/cm² Blue Light Hazard 3150 µW/cm² (86.7 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 57.4 µW/cm² Lumen Reptil 39800 "pseudo-lx" Vitamin D3 Degradation 41.9 µW/cm² Actinic UV 18.3 µW/cm² (5.05 mW/klm) Exctincition Lumisterol 138000 m²/mol Exctincition 7DHC 159000 m²/mol Exctincition Toxisterols 24600 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 232 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 16 Leybold UVB 161 µW/cm² Leybold UVA 1440 µW/cm² Leybold UVC 1.55 µW/cm² DeltaOhm UVB 338 µW/cm² DeltaOhm UVC 46.2 µW/cm² Vernier UVB 67.2 µW/cm² Vernier UVA 891 µW/cm² Gröbel UVA 1600 µW/cm² Gröbel UVB 98.7 µW/cm² Gröbel UVC 1.85 µW/cm² Luxmeter 38100 lx Solarmeter 6.4 (D3) 49.9 IU/min UVX-31 431 µW/cm² IL UVB 0.105 µW/cm² IL UVA 1740 µW/cm² Solarmeter 6.5 (UVI, post 2010) 11.5 UV-Index Solarmeter 6.2 (UVB, post 2010) 138 µW/cm² (Solarmeter Ratio = 11.9) Solarmeter AlGaN 6.5 UVI sensor 117 UV Index GenUV 7.1 UV-Index 6.55 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 166 W/m² Solarmeter 4.0 (UVA) 28.7 mW/cm² LS122 (manuf.) 4.37 W/m² ISM400 (first guess) 126 W/m² LS122 (assumption) 7.78 W/m² ISM400_new 115 W/m² Solarmeter 10.0 (Global Power) (assumption) 155 W/m²