This lamp is similar to, but not identical to, the one used to calibrate the 2006 Solarmeter 6.5
Spectrum 473: Cal Lamp for 2004 Solarmeter 6-2 meter Edit
DeleteMeasurement
| Brand |
other other |
|---|---|
| Lamp Product |
Solarmeter Calibration Lamp |
| Lamp ID |
Cal Lamp for 2004 Solarmeter 6-2 meter (04/2004) This lamp is similar to, but not identical to, the one used to calibrate the 2006 Solarmeter 6.5 |
| Spectrometer | - |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 18 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 ) | ( 6.3E-5 ; 0.012 ) | ( 5.4E-6 ; 6.3E-5 ; 0.012 ) |
| 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) 2330 µW/cm² = 23.3 W/m² UVC ( 0 nm - 280 nm) 0.0257 µW/cm² = 0.000257 W/m² non-terrestrial ( 0 nm - 290 nm) 0.122 µW/cm² = 0.00122 W/m² total2 ( 250 nm - 880 nm) 2330 µW/cm² = 23.3 W/m² UVB (EU) ( 280 nm - 315 nm) 105 µW/cm² = 1.05 W/m² UVB (US) ( 280 nm - 320 nm) 159 µW/cm² = 1.59 W/m² UVA+B ( 280 nm - 380 nm) 2220 µW/cm² = 22.2 W/m² Solar UVB ( 290 nm - 315 nm) 105 µW/cm² = 1.05 W/m² UVA D3 regulating ( 315 nm - 335 nm) 467 µW/cm² = 4.67 W/m² UVA (EU) ( 315 nm - 380 nm) 2110 µW/cm² = 21.1 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 582 µW/cm² = 5.82 W/m² UVA (US) ( 320 nm - 380 nm) 2060 µW/cm² = 20.6 W/m² UVA1 (variant) ( 335 nm - 380 nm) 1640 µW/cm² = 16.4 W/m² UVA1 (medical) ( 340 nm - 400 nm) 1590 µW/cm² = 15.9 W/m² vis. UVA ( 350 nm - 380 nm) 981 µW/cm² = 9.81 W/m² VIS Rep3 ( 350 nm - 600 nm) 1100 µW/cm² = 11 W/m² VIS Rep4 ( 350 nm - 700 nm) 1100 µW/cm² = 11 W/m² purple ( 380 nm - 420 nm) 117 µW/cm² = 1.17 W/m² VIS ( 380 nm - 780 nm) 117 µW/cm² = 1.17 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 5.69 UV-Index Pyrimidine dimerization of DNA 61.9 µW/cm² Photoceratitis 7.55 µW/cm² Photoconjunctivitis 0.146 µW/cm² DNA Damage 0.494 Vitamin D3 22.6 µW/cm² Photosynthesis 0 µW/cm² Luminosity 0.19 lx Human L-Cone 0.0274 µW/cm² Human M-Cone 0.0249 µW/cm² Human S-Cone 0.621 µW/cm² CIE X 0.607 µW/cm² CIE Y 0.0175 µW/cm² CIE Z 2.86 µW/cm² PAR 0 mol photons Extinction preD3 175 e-3*m²/mol Extinction Tachysterol 641 e-3*m²/mol Exctincition PreD3 95500 m²/mol Extinction Lumisterol 19.3 m²/mol Exctincition Tachysterol 1110000 m²/mol Extinction 7DHC 16.6 m²/mol L-Cone 0.00671 µW/cm² M-Cone 0.0778 µW/cm² S-Cone 15.4 µW/cm² U-Cone 1220 µW/cm² UVR - ICNIRP 2004 4.21 Rel Biol Eff Melatonin Supression 0 µW/cm² Blue Light Hazard 24.6 µW/cm² (130000 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 24 µW/cm² Lumen Reptil 1610 "pseudo-lx" Vitamin D3 Degradation 33.3 µW/cm² Actinic UV 4.16 µW/cm² (220000 mW/klm) Exctincition Lumisterol 30900 m²/mol Exctincition 7DHC 22500 m²/mol Exctincition Toxisterols 22500 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 219 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 6.8 Leybold UVB 150 µW/cm² Leybold UVA 1610 µW/cm² Leybold UVC 0.0236 µW/cm² DeltaOhm UVB 539 µW/cm² DeltaOhm UVC 44.3 µW/cm² Vernier UVB 48.7 µW/cm² Vernier UVA 1490 µW/cm² Gröbel UVA 1840 µW/cm² Gröbel UVB 74.5 µW/cm² Gröbel UVC -0.0259 µW/cm² Luxmeter 0.209 lx Solarmeter 6.4 (D3) 21.3 IU/min UVX-31 667 µW/cm² IL UVB 0.111 µW/cm² IL UVA 1770 µW/cm² Solarmeter 6.5 (UVI, post 2010) 5.75 UV-Index Solarmeter 6.2 (UVB, post 2010) 156 µW/cm² (Solarmeter Ratio = 27.2) Solarmeter AlGaN 6.5 UVI sensor 81.6 UV Index GenUV 7.1 UV-Index 4.96 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 10.2 W/m² Solarmeter 4.0 (UVA) 22.3 mW/cm² LS122 (manuf.) 0 W/m² ISM400 (first guess) 1.36 W/m² LS122 (assumption) 0 W/m² ISM400_new 0.67 W/m² Solarmeter 10.0 (Global Power) (assumption) 4.76 W/m²