Characterizing the Performance of Integral Measuring UV-Meters. 2000. UV News 6. A-1–AA-36.
Spectrum 115: SW-T19 Edit
DeleteMeasurement
| Brand |
other other |
|---|---|
| Lamp Product |
UVA Tanning |
| Lamp ID |
SW-T19 (03/2010) |
| Spectrometer | - |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 0 cm |
| Age | 0 hours |
| Originator (measurement) | Publication |
Database entry created:
Sarina Wunderlich
8/Mar/2010 ; updated:
Sarina Wunderlich
9/Oct/2011
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.
WARNING: The measurement range (350 - 800 nm) is not sufficient for this evaluation! Data is only available in the range 240 - 559 nm. Results are shown anyway but should be ignored by anyone except experts.
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 | ( 0.2 ; 0.21 ) | ( 0.019 ; 0.13 ) | ( 0.022 ; 0.018 ; 0.13 ) |
| CCT | 0 Kelvin | 0 Kelvin | 0 Kelvin |
| distance | 0 | 0 | |
| 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) 46.2 µW/cm² = 0.462 W/m² UVC ( 0 nm - 280 nm) 1.73E-5 µW/cm² = 1.73E-7 W/m² non-terrestrial ( 0 nm - 290 nm) 0.000526 µW/cm² = 5.26E-6 W/m² total2 ( 250 nm - 880 nm) 46.2 µW/cm² = 0.462 W/m² UVB (EU) ( 280 nm - 315 nm) 0.425 µW/cm² = 0.00425 W/m² UVB (US) ( 280 nm - 320 nm) 0.81 µW/cm² = 0.0081 W/m² UVA+B ( 280 nm - 380 nm) 39.3 µW/cm² = 0.393 W/m² Solar UVB ( 290 nm - 315 nm) 0.425 µW/cm² = 0.00425 W/m² UVA D3 regulating ( 315 nm - 335 nm) 5.12 µW/cm² = 0.0512 W/m² UVA (EU) ( 315 nm - 380 nm) 38.8 µW/cm² = 0.388 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 8.09 µW/cm² = 0.0809 W/m² UVA (US) ( 320 nm - 380 nm) 38.5 µW/cm² = 0.385 W/m² UVA1 (variant) ( 335 nm - 380 nm) 33.7 µW/cm² = 0.337 W/m² UVA1 (medical) ( 340 nm - 400 nm) 32.9 µW/cm² = 0.329 W/m² vis. UVA ( 350 nm - 380 nm) 21.3 µW/cm² = 0.213 W/m² VIS Rep3 ( 350 nm - 600 nm) 28.2 µW/cm² = 0.282 W/m² VIS Rep4 ( 350 nm - 700 nm) 28.2 µW/cm² = 0.282 W/m² purple ( 380 nm - 420 nm) 3.9 µW/cm² = 0.039 W/m² VIS ( 380 nm - 780 nm) 6.91 µW/cm² = 0.0691 W/m² PAR ( 400 nm - 700 nm) 4.35 µW/cm² = 0.0435 W/m² blue ( 420 nm - 490 nm) 1.87 µW/cm² = 0.0187 W/m² green ( 490 nm - 575 nm) 1.14 µW/cm² = 0.0114 W/m² yellow ( 575 nm - 585 nm) 0 µW/cm² = 0 W/m² orange ( 585 nm - 650 nm) 0 µW/cm² = 0 W/m² red ( 650 nm - 780 nm) 0 µW/cm² = 0 W/m² IRA ( 700 nm - 1400 nm) 0 µW/cm² = 0 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 0.0303 UV-Index Pyrimidine dimerization of DNA 0.32 µW/cm² Photoceratitis 0.0307 µW/cm² Photoconjunctivitis 0.000445 µW/cm² DNA Damage 0.00171 Vitamin D3 0.079 µW/cm² Photosynthesis 3.15 µW/cm² Luminosity 8.18 lx Human L-Cone 1.12 µW/cm² Human M-Cone 1.23 µW/cm² Human S-Cone 1.91 µW/cm² CIE X 1.09 µW/cm² CIE Y 1.14 µW/cm² CIE Z 3.31 µW/cm² PAR 24800 mol photons Extinction preD3 0.96 e-3*m²/mol Extinction Tachysterol 3.77 e-3*m²/mol Exctincition PreD3 731 m²/mol Extinction Lumisterol 0.064 m²/mol Exctincition Tachysterol 9620 m²/mol Extinction 7DHC 0.057 m²/mol L-Cone 0.778 µW/cm² M-Cone 0.646 µW/cm² S-Cone 4.45 µW/cm² U-Cone 29.1 µW/cm² UVR - ICNIRP 2004 0.0207 Rel Biol Eff Melatonin Supression 2.14 µW/cm² Blue Light Hazard 2.65 µW/cm² (324 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 0.081 µW/cm² Lumen Reptil 51.1 "pseudo-lx" Vitamin D3 Degradation 0.211 µW/cm² Actinic UV 0.0206 µW/cm² (25.2 mW/klm) Exctincition Lumisterol 116 m²/mol Exctincition 7DHC 80.7 m²/mol Exctincition Toxisterols 251 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 1.51 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 0.0288 Leybold UVB 0.939 µW/cm² Leybold UVA 30.9 µW/cm² Leybold UVC 3.83E-5 µW/cm² DeltaOhm UVB 6.11 µW/cm² DeltaOhm UVC 0.373 µW/cm² Vernier UVB 0.181 µW/cm² Vernier UVA 25.3 µW/cm² Gröbel UVA 34.1 µW/cm² Gröbel UVB 0.479 µW/cm² Gröbel UVC -0.000274 µW/cm² Solarmeter 6.4 (D3) 0.0899 IU/min UVX-31 8.57 µW/cm² IL UVB 0.00106 µW/cm² IL UVA 34.1 µW/cm² Solarmeter 6.5 (UVI, post 2010) 0.0249 UV-Index Solarmeter 6.2 (UVB, post 2010) 1.21 µW/cm² (Solarmeter Ratio = 48.5) Solarmeter AlGaN 6.5 UVI sensor 0.378 UV Index GenUV 7.1 UV-Index 0.0293 UV-Index Solarmeter 10.0 (Global Power) 0.221 W/m² Solarmeter 4.0 (UVA) 0.432 mW/cm² LS122 0 W/m² ISM400 0.0419 W/m²