Spectrum 787: SW90 Edit
DeleteMeasurement
| Brand |
Exo Terra Rolf C. Hagen Inc. http://www.hagen.com/ |
|---|---|
| Lamp Product |
Reptile UVB 150 13W Former Repti Glo 10.0 (and 8.0) |
| Lamp ID |
SW90 (12/2023) |
| Spectrometer | USB2000+ |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 5 cm |
| Age | 100 hours |
| Originator (measurement) | Sarina Wunderlich |
Database entry created:
Sarina Wunderlich
28/May/2024 ; updated:
Sarina Wunderlich
21/Jun/2024
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 | ( 0.43 ; 0.41 ) | ( 0.37 ; 0.35 ) | ( 0.48 ; 0.19 ; 0.18 ) |
| CCT | 3100 Kelvin | 5500 Kelvin | 3100 Kelvin |
| distance | 0.0075 | 0.1 | |
| 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) 1730 µW/cm² = 17.3 W/m² UVC ( 0 nm - 280 nm) 0 µW/cm² = 0 W/m² non-terrestrial ( 0 nm - 290 nm) 1.92 µW/cm² = 0.0192 W/m² total2 ( 250 nm - 880 nm) 1730 µW/cm² = 17.3 W/m² UVB (EU) ( 280 nm - 315 nm) 119 µW/cm² = 1.19 W/m² UVB (US) ( 280 nm - 320 nm) 164 µW/cm² = 1.64 W/m² UVA+B ( 280 nm - 380 nm) 513 µW/cm² = 5.13 W/m² Solar UVB ( 290 nm - 315 nm) 117 µW/cm² = 1.17 W/m² UVA D3 regulating ( 315 nm - 335 nm) 194 µW/cm² = 1.94 W/m² UVA (EU) ( 315 nm - 380 nm) 394 µW/cm² = 3.94 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 192 µW/cm² = 1.92 W/m² UVA (US) ( 320 nm - 380 nm) 349 µW/cm² = 3.49 W/m² UVA1 (variant) ( 335 nm - 380 nm) 199 µW/cm² = 1.99 W/m² UVA1 (medical) ( 340 nm - 400 nm) 165 µW/cm² = 1.65 W/m² vis. UVA ( 350 nm - 380 nm) 96.9 µW/cm² = 0.969 W/m² VIS Rep3 ( 350 nm - 600 nm) 833 µW/cm² = 8.33 W/m² VIS Rep4 ( 350 nm - 700 nm) 1270 µW/cm² = 12.7 W/m² purple ( 380 nm - 420 nm) 61.4 µW/cm² = 0.614 W/m² VIS ( 380 nm - 780 nm) 1210 µW/cm² = 12.1 W/m² VIS2 ( 400 nm - 680 nm) 1150 µW/cm² = 11.5 W/m² PAR ( 400 nm - 700 nm) 1160 µW/cm² = 11.6 W/m² tmp ( 400 nm - 1100 nm) 1210 µW/cm² = 12.1 W/m² blue ( 420 nm - 490 nm) 160 µW/cm² = 1.6 W/m² green ( 490 nm - 575 nm) 366 µW/cm² = 3.66 W/m² yellow ( 575 nm - 585 nm) 71.5 µW/cm² = 0.715 W/m² orange ( 585 nm - 650 nm) 470 µW/cm² = 4.7 W/m² red ( 650 nm - 780 nm) 82 µW/cm² = 0.82 W/m² IRA ( 700 nm - 1400 nm) 51 µW/cm² = 0.51 W/m² IR2 ( 720 nm - 1100 nm) 15.1 µW/cm² = 0.151 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 11.5 UV-Index Pyrimidine dimerization of DNA 72.9 µW/cm² Photoceratitis 17.9 µW/cm² Photoconjunctivitis 0.759 µW/cm² DNA Damage 2.39 Vitamin D3 43.5 µW/cm² Photosynthesis 720 µW/cm² Luminosity 4570 lx Human L-Cone 713 µW/cm² Human M-Cone 509 µW/cm² Human S-Cone 127 µW/cm² CIE X 669 µW/cm² CIE Y 638 µW/cm² CIE Z 231 µW/cm² PAR 5730000 mol photons Extinction preD3 223 e-3*m²/mol Extinction Tachysterol 797 e-3*m²/mol Exctincition PreD3 111000 m²/mol Extinction Lumisterol 68.4 m²/mol Exctincition Tachysterol 1080000 m²/mol Extinction 7DHC 77.9 m²/mol L-Cone 632 µW/cm² M-Cone 253 µW/cm² S-Cone 241 µW/cm² U-Cone 194 µW/cm² UVR - ICNIRP 2004 11.8 Rel Biol Eff Melatonin Supression 185 µW/cm² Blue Light Hazard 155 µW/cm² (33.9 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 47.4 µW/cm² Lumen Reptil 3390 "pseudo-lx" Vitamin D3 Degradation 35.7 µW/cm² Actinic UV 11.6 µW/cm² (25.5 mW/klm) Exctincition Lumisterol 86700 m²/mol Exctincition 7DHC 95500 m²/mol Exctincition Toxisterols 14600 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 196 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 12.6 Leybold UVB 143 µW/cm² Leybold UVA 234 µW/cm² Leybold UVC 0.0433 µW/cm² DeltaOhm UVB 279 µW/cm² DeltaOhm UVC 38.3 µW/cm² Vernier UVB 63.4 µW/cm² Vernier UVA 298 µW/cm² Gröbel UVA 330 µW/cm² Gröbel UVB 84.2 µW/cm² Gröbel UVC 0.0295 µW/cm² Luxmeter 4520 lx Solarmeter 6.4 (D3) 39.4 IU/min UVX-31 299 µW/cm² IL UVB 0.0841 µW/cm² IL UVA 271 µW/cm² Solarmeter 6.5 (UVI, post 2010) 9.43 UV-Index Solarmeter 6.2 (UVB, post 2010) 122 µW/cm² (Solarmeter Ratio = 12.9) Solarmeter AlGaN 6.5 UVI sensor 102 UV Index GenUV 7.1 UV-Index 5.39 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 15.7 W/m² Solarmeter 4.0 (UVA) 3.55 mW/cm² LS122 (manuf.) 0.0134 W/m² ISM400 (first guess) 10.3 W/m² LS122 (assumption) 0.602 W/m² ISM400_new 8.4 W/m² Solarmeter 10.0 (Global Power) (assumption) 14.5 W/m²