Spectrum 332: BOL4 Edit
DeleteMeasurement
| Brand |
Ott-Lite http://www.ottlite.com/ |
|---|---|
| Lamp Product |
Natural Light Suppement T12 20W |
| Lamp ID |
BOL4 (04/2008) |
| Spectrometer | USB2000+ |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 10 cm |
| Age | 1 hours |
| Originator (measurement) | Frances Baines |
Database entry created:
Sarina Wunderlich
3/Jul/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 ; 0.32 ) | ( 0.37 ; 0.42 ) | ( 0.27 ; 0.27 ; 0.31 ) |
| CCT | 6300 Kelvin | 5500 Kelvin | 5500 Kelvin |
| distance | 0.08 | 0.059 | |
| 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) 678 µW/cm² = 6.78 W/m² UVC ( 0 nm - 280 nm) 0.054 µW/cm² = 0.00054 W/m² non-terrestrial ( 0 nm - 290 nm) 0.054 µW/cm² = 0.00054 W/m² total2 ( 250 nm - 880 nm) 678 µW/cm² = 6.78 W/m² UVB (EU) ( 280 nm - 315 nm) 4.56 µW/cm² = 0.0456 W/m² UVB (US) ( 280 nm - 320 nm) 4.89 µW/cm² = 0.0489 W/m² UVA+B ( 280 nm - 380 nm) 54 µW/cm² = 0.54 W/m² Solar UVB ( 290 nm - 315 nm) 4.56 µW/cm² = 0.0456 W/m² UVA D3 regulating ( 315 nm - 335 nm) 4.64 µW/cm² = 0.0464 W/m² UVA (EU) ( 315 nm - 380 nm) 49.5 µW/cm² = 0.495 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 7.4 µW/cm² = 0.074 W/m² UVA (US) ( 320 nm - 380 nm) 49.2 µW/cm² = 0.492 W/m² UVA1 (variant) ( 335 nm - 380 nm) 44.8 µW/cm² = 0.448 W/m² UVA1 (medical) ( 340 nm - 400 nm) 56.1 µW/cm² = 0.561 W/m² vis. UVA ( 350 nm - 380 nm) 33.4 µW/cm² = 0.334 W/m² VIS Rep3 ( 350 nm - 600 nm) 459 µW/cm² = 4.59 W/m² VIS Rep4 ( 350 nm - 700 nm) 618 µW/cm² = 6.18 W/m² purple ( 380 nm - 420 nm) 46.6 µW/cm² = 0.466 W/m² VIS ( 380 nm - 780 nm) 620 µW/cm² = 6.2 W/m² VIS2 ( 400 nm - 680 nm) 549 µW/cm² = 5.49 W/m² PAR ( 400 nm - 700 nm) 570 µW/cm² = 5.7 W/m² tmp ( 400 nm - 1100 nm) 609 µW/cm² = 6.09 W/m² blue ( 420 nm - 490 nm) 156 µW/cm² = 1.56 W/m² green ( 490 nm - 575 nm) 175 µW/cm² = 1.75 W/m² yellow ( 575 nm - 585 nm) 21.4 µW/cm² = 0.214 W/m² orange ( 585 nm - 650 nm) 120 µW/cm² = 1.2 W/m² red ( 650 nm - 780 nm) 101 µW/cm² = 1.01 W/m² IRA ( 700 nm - 1400 nm) 39.2 µW/cm² = 0.392 W/m² IR2 ( 720 nm - 1100 nm) 24.3 µW/cm² = 0.243 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 0.197 UV-Index Pyrimidine dimerization of DNA 1.59 µW/cm² Photoceratitis 0.322 µW/cm² Photoconjunctivitis 0.0529 µW/cm² DNA Damage 0.0711 Vitamin D3 0.658 µW/cm² Photosynthesis 401 µW/cm² Luminosity 1560 lx Human L-Cone 232 µW/cm² Human M-Cone 196 µW/cm² Human S-Cone 130 µW/cm² CIE X 212 µW/cm² CIE Y 216 µW/cm² CIE Z 241 µW/cm² PAR 2710000 mol photons Extinction preD3 5.35 e-3*m²/mol Extinction Tachysterol 17.6 e-3*m²/mol Exctincition PreD3 2910 m²/mol Extinction Lumisterol 0.902 m²/mol Exctincition Tachysterol 26400 m²/mol Extinction 7DHC 1 m²/mol L-Cone 196 µW/cm² M-Cone 198 µW/cm² S-Cone 226 µW/cm² U-Cone 110 µW/cm² UVR - ICNIRP 2004 0.165 Rel Biol Eff Melatonin Supression 182 µW/cm² Blue Light Hazard 147 µW/cm² (94.3 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 0.661 µW/cm² Lumen Reptil 1660 "pseudo-lx" Vitamin D3 Degradation 0.883 µW/cm² Actinic UV 0.163 µW/cm² (1.04 mW/klm) Exctincition Lumisterol 1220 m²/mol Exctincition 7DHC 1250 m²/mol Exctincition Toxisterols 922 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 5.4 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 0.179 Leybold UVB 4.16 µW/cm² Leybold UVA 39 µW/cm² Leybold UVC 0.0518 µW/cm² DeltaOhm UVB 9.11 µW/cm² DeltaOhm UVC 1.01 µW/cm² Vernier UVB 1.32 µW/cm² Vernier UVA 26.4 µW/cm² Gröbel UVA 43.6 µW/cm² Gröbel UVB 2.19 µW/cm² Gröbel UVC 0.0436 µW/cm² Luxmeter 1580 lx Solarmeter 6.4 (D3) 0.558 IU/min UVX-31 12.1 µW/cm² IL UVB 0.00242 µW/cm² IL UVA 45.6 µW/cm² Solarmeter 6.5 (UVI, post 2010) 0.158 UV-Index Solarmeter 6.2 (UVB, post 2010) 3.26 µW/cm² (Solarmeter Ratio = 20.6) Solarmeter AlGaN 6.5 UVI sensor 2.92 UV Index GenUV 7.1 UV-Index 0.161 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 6.81 W/m² Solarmeter 4.0 (UVA) 0.689 mW/cm² LS122 (manuf.) 0.0012 W/m² ISM400 (first guess) 4.83 W/m² LS122 (assumption) 0.233 W/m² ISM400_new 4.02 W/m² Solarmeter 10.0 (Global Power) (assumption) 6.46 W/m²