This calibration lamp is similar to, but not identical to, the one used to calibrate the 2010 Solarmeter 6.5 meters
Spectrum 474: Cal Lamp for Solarmeter 6.2 from 2010 onwards Edit
DeleteMeasurement
| Brand |
other other |
|---|---|
| Lamp Product |
Solarmeter Calibration Lamp |
| Lamp ID |
Cal Lamp for Solarmeter 6.2 from 2010 onwards (04/2010) This calibration lamp is similar to, but not identical to, the one used to calibrate the 2010 Solarmeter 6.5 meters |
| Spectrometer | - |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 20 cm |
| Age | 0 hours |
| Originator (measurement) | Publication |
Database entry created:
Frances Baines
18/Apr/2012 ; updated:
Frances Baines
18/Apr/2012
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 250 - 400 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 | ( 0.17 ; 0.005 ) | ( 6.4E-5 ; 0.013 ) | ( 5.5E-6 ; 6.4E-5 ; 0.013 ) |
| 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) 1600 µW/cm² = 16 W/m² UVC ( 0 nm - 280 nm) 0.00551 µW/cm² = 5.51E-5 W/m² non-terrestrial ( 0 nm - 290 nm) 0.045 µW/cm² = 0.00045 W/m² total2 ( 250 nm - 880 nm) 1600 µW/cm² = 16 W/m² UVB (EU) ( 280 nm - 315 nm) 63.5 µW/cm² = 0.635 W/m² UVB (US) ( 280 nm - 320 nm) 96.4 µW/cm² = 0.964 W/m² UVA+B ( 280 nm - 380 nm) 1510 µW/cm² = 15.1 W/m² Solar UVB ( 290 nm - 315 nm) 63.5 µW/cm² = 0.635 W/m² UVA D3 regulating ( 315 nm - 335 nm) 293 µW/cm² = 2.93 W/m² UVA (EU) ( 315 nm - 380 nm) 1440 µW/cm² = 14.4 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 370 µW/cm² = 3.7 W/m² UVA (US) ( 320 nm - 380 nm) 1410 µW/cm² = 14.1 W/m² UVA1 (variant) ( 335 nm - 380 nm) 1150 µW/cm² = 11.5 W/m² UVA1 (medical) ( 340 nm - 400 nm) 1130 µW/cm² = 11.3 W/m² vis. UVA ( 350 nm - 380 nm) 710 µW/cm² = 7.1 W/m² VIS Rep3 ( 350 nm - 600 nm) 800 µW/cm² = 8 W/m² VIS Rep4 ( 350 nm - 700 nm) 800 µW/cm² = 8 W/m² purple ( 380 nm - 420 nm) 90.4 µW/cm² = 0.904 W/m² VIS ( 380 nm - 780 nm) 90.4 µW/cm² = 0.904 W/m² VIS2 ( 400 nm - 680 nm) 0 µW/cm² = 0 W/m² PAR ( 400 nm - 700 nm) 0 µW/cm² = 0 W/m² tmp ( 400 nm - 1100 nm) 0 µW/cm² = 0 W/m² blue ( 420 nm - 490 nm) 0 µW/cm² = 0 W/m² green ( 490 nm - 575 nm) 0 µW/cm² = 0 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 IR2 ( 720 nm - 1100 nm) 0 µW/cm² = 0 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 3.31 UV-Index Pyrimidine dimerization of DNA 36.6 µW/cm² Photoceratitis 4.25 µW/cm² Photoconjunctivitis 0.0717 µW/cm² DNA Damage 0.262 Vitamin D3 12.8 µW/cm² Photosynthesis 0 µW/cm² Luminosity 0.142 lx Human L-Cone 0.0206 µW/cm² Human M-Cone 0.0187 µW/cm² Human S-Cone 0.466 µW/cm² CIE X 0.46 µW/cm² CIE Y 0.0133 µW/cm² CIE Z 2.17 µW/cm² PAR 0 mol photons Extinction preD3 104 e-3*m²/mol Extinction Tachysterol 385 e-3*m²/mol Exctincition PreD3 57900 m²/mol Extinction Lumisterol 10.5 m²/mol Exctincition Tachysterol 683000 m²/mol Extinction 7DHC 9.01 m²/mol L-Cone 0.00506 µW/cm² M-Cone 0.059 µW/cm² S-Cone 11.7 µW/cm² U-Cone 913 µW/cm² UVR - ICNIRP 2004 2.38 Rel Biol Eff Melatonin Supression 0 µW/cm² Blue Light Hazard 17 µW/cm² (119000 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 13.4 µW/cm² Lumen Reptil 1210 "pseudo-lx" Vitamin D3 Degradation 20.2 µW/cm² Actinic UV 2.36 µW/cm² (166000 mW/klm) Exctincition Lumisterol 17300 m²/mol Exctincition 7DHC 12300 m²/mol Exctincition Toxisterols 14100 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 134 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 3.9 Leybold UVB 90.9 µW/cm² Leybold UVA 1110 µW/cm² Leybold UVC 0.00748 µW/cm² DeltaOhm UVB 339 µW/cm² DeltaOhm UVC 27.2 µW/cm² Vernier UVB 28.2 µW/cm² Vernier UVA 1000 µW/cm² Gröbel UVA 1260 µW/cm² Gröbel UVB 44.8 µW/cm² Gröbel UVC -0.0254 µW/cm² Luxmeter 0.157 lx Solarmeter 6.4 (D3) 12.2 IU/min UVX-31 426 µW/cm² IL UVB 0.0689 µW/cm² IL UVA 1230 µW/cm² Solarmeter 6.5 (UVI, post 2010) 3.31 UV-Index Solarmeter 6.2 (UVB, post 2010) 96.4 µW/cm² (Solarmeter Ratio = 29.1) Solarmeter AlGaN 6.5 UVI sensor 48.3 UV Index GenUV 7.1 UV-Index 3 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 7.04 W/m² Solarmeter 4.0 (UVA) 15.5 mW/cm² LS122 (manuf.) 0 W/m² ISM400 (first guess) 0.964 W/m² LS122 (assumption) 0 W/m² ISM400_new 0.474 W/m² Solarmeter 10.0 (Global Power) (assumption) 3.31 W/m²