03-07-2009 13:56
direct sun - clear sky
Solarmeter Readings:
6.5 UVI = 6.3
6.2 UVB = 288
luxmeter = 124,000
Spectrum 339: SUN Edit
DeleteMeasurement
| Brand |
other other |
|---|---|
| Lamp Product |
Sun Direct sunlight |
| Lamp ID |
SUN (01/2000) |
| Spectrometer | USB2000+ (2) |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 0 cm |
| Age | 0 hours |
| Originator (measurement) | Frances Baines |
Database entry created:
Sarina Wunderlich
14/Dec/2010 ; updated:
Sarina Wunderlich
27/Feb/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.
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 ; 0.33 ) | ( 0.42 ; 0.38 ) | ( 0.28 ; 0.3 ; 0.27 ) |
| CCT | 5900 Kelvin | 4700 Kelvin | 5200 Kelvin |
| distance | 0.039 | 0.039 | |
| 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) 59900 µW/cm² = 599 W/m² UVC ( 0 nm - 280 nm) 0 µW/cm² = 0 W/m² non-terrestrial ( 0 nm - 290 nm) 0 µW/cm² = 0 W/m² total2 ( 250 nm - 880 nm) 59900 µW/cm² = 599 W/m² UVB (EU) ( 280 nm - 315 nm) 68.1 µW/cm² = 0.681 W/m² UVB (US) ( 280 nm - 320 nm) 149 µW/cm² = 1.49 W/m² UVA+B ( 280 nm - 380 nm) 3080 µW/cm² = 30.8 W/m² Solar UVB ( 290 nm - 315 nm) 68.1 µW/cm² = 0.681 W/m² UVA D3 regulating ( 315 nm - 335 nm) 568 µW/cm² = 5.68 W/m² UVA (EU) ( 315 nm - 380 nm) 3010 µW/cm² = 30.1 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 689 µW/cm² = 6.89 W/m² UVA (US) ( 320 nm - 380 nm) 2930 µW/cm² = 29.3 W/m² UVA1 (variant) ( 335 nm - 380 nm) 2450 µW/cm² = 24.5 W/m² UVA1 (medical) ( 340 nm - 400 nm) 3630 µW/cm² = 36.3 W/m² vis. UVA ( 350 nm - 380 nm) 1810 µW/cm² = 18.1 W/m² VIS Rep3 ( 350 nm - 600 nm) 33300 µW/cm² = 333 W/m² VIS Rep4 ( 350 nm - 700 nm) 46700 µW/cm² = 467 W/m² purple ( 380 nm - 420 nm) 3910 µW/cm² = 39.1 W/m² VIS ( 380 nm - 780 nm) 52700 µW/cm² = 527 W/m² PAR ( 400 nm - 700 nm) 43500 µW/cm² = 435 W/m² blue ( 420 nm - 490 nm) 11000 µW/cm² = 110 W/m² green ( 490 nm - 575 nm) 13000 µW/cm² = 130 W/m² yellow ( 575 nm - 585 nm) 1480 µW/cm² = 14.8 W/m² orange ( 585 nm - 650 nm) 9250 µW/cm² = 92.5 W/m² red ( 650 nm - 780 nm) 14100 µW/cm² = 141 W/m² IRA ( 700 nm - 1400 nm) 12000 µW/cm² = 120 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 2.98 UV-Index Pyrimidine dimerization of DNA 46.3 µW/cm² Photoceratitis 3.76 µW/cm² Photoconjunctivitis 0.0165 µW/cm² DNA Damage 0.0583 Vitamin D3 9.57 µW/cm² Photosynthesis 31000 µW/cm² Luminosity 116000 lx Human L-Cone 17200 µW/cm² Human M-Cone 14400 µW/cm² Human S-Cone 8900 µW/cm² CIE X 15600 µW/cm² CIE Y 16000 µW/cm² CIE Z 16500 µW/cm² PAR 205000000 mol photons Extinction preD3 146 e-3*m²/mol Extinction Tachysterol 559 e-3*m²/mol Exctincition PreD3 82800 m²/mol Extinction Lumisterol 3.44 m²/mol Exctincition Tachysterol 1040000 m²/mol Extinction 7DHC 0.741 m²/mol L-Cone 14700 µW/cm² M-Cone 16000 µW/cm² S-Cone 14500 µW/cm² U-Cone 7890 µW/cm² UVR - ICNIRP 2004 1.44 Rel Biol Eff Melatonin Supression 13600 µW/cm² Blue Light Hazard 10200 µW/cm² (88.3 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 9.71 µW/cm² Lumen Reptil 123000 "pseudo-lx" Vitamin D3 Degradation 31 µW/cm² Actinic UV 1.46 µW/cm² (0.126 mW/klm) Exctincition Lumisterol 10700 m²/mol Exctincition 7DHC 2700 m²/mol Exctincition Toxisterols 22800 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 230 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 3.33 Leybold UVB 143 µW/cm² Leybold UVA 2200 µW/cm² Leybold UVC 0 µW/cm² DeltaOhm UVB 605 µW/cm² DeltaOhm UVC 56.5 µW/cm² Vernier UVB 26.1 µW/cm² Vernier UVA 1580 µW/cm² Gröbel UVA 2450 µW/cm² Gröbel UVB 58.3 µW/cm² Gröbel UVC -0.0546 µW/cm² Solarmeter 6.4 (D3) 10.4 IU/min UVX-31 726 µW/cm² IL UVB 0.113 µW/cm² IL UVA 2590 µW/cm² Solarmeter 6.5 (UVI, post 2010) 3.09 UV-Index Solarmeter 6.2 (UVB, post 2010) 174 µW/cm² (Solarmeter Ratio = 56.4) Solarmeter AlGaN 6.5 UVI sensor 59.7 UV Index GenUV 7.1 UV-Index 4.5 UV-Index Solarmeter 10.0 (Global Power) 670 W/m² Solarmeter 4.0 (UVA) 43.3 mW/cm² LS122 1.16 W/m² ISM400 560 W/m²