Spectrum 506: MG-L2 Edit
DeleteMeasurement
| Brand |
Osram Osram GmbH http://www.osram.de/ |
|---|---|
| Lamp Product |
Lumilux |
| Lamp ID |
MG-L2 (08/2014) |
| Spectrometer | - |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 0 cm |
| Age | 0 hours |
| Originator (measurement) | Markus Grimm |
Database entry created:
Sarina Wunderlich
23/Aug/2014 ; updated:
Sarina Wunderlich
23/Aug/2014
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 | ( 0.33 ; 0.37 ) | ( 0.45 ; 0.45 ) | ( 0.35 ; 0.29 ; 0.29 ) |
| CCT | 5500 Kelvin | 4400 Kelvin | 4200 Kelvin |
| distance | 0.11 | 0.074 | |
| 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) 363000 µW/cm² = 3630 W/m² UVC ( 0 nm - 280 nm) 1660 µW/cm² = 16.6 W/m² non-terrestrial ( 0 nm - 290 nm) 1800 µW/cm² = 18 W/m² total2 ( 250 nm - 880 nm) 342000 µW/cm² = 3420 W/m² UVB (EU) ( 280 nm - 315 nm) 1060 µW/cm² = 10.6 W/m² UVB (US) ( 280 nm - 320 nm) 1240 µW/cm² = 12.4 W/m² UVA+B ( 280 nm - 380 nm) 8870 µW/cm² = 88.7 W/m² Solar UVB ( 290 nm - 315 nm) 913 µW/cm² = 9.13 W/m² UVA D3 regulating ( 315 nm - 335 nm) 1230 µW/cm² = 12.3 W/m² UVA (EU) ( 315 nm - 380 nm) 7810 µW/cm² = 78.1 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 1480 µW/cm² = 14.8 W/m² UVA (US) ( 320 nm - 380 nm) 7630 µW/cm² = 76.3 W/m² UVA1 (variant) ( 335 nm - 380 nm) 6590 µW/cm² = 65.9 W/m² UVA1 (medical) ( 340 nm - 400 nm) 12900 µW/cm² = 129 W/m² vis. UVA ( 350 nm - 380 nm) 5220 µW/cm² = 52.2 W/m² VIS Rep3 ( 350 nm - 600 nm) 251000 µW/cm² = 2510 W/m² VIS Rep4 ( 350 nm - 700 nm) 327000 µW/cm² = 3270 W/m² purple ( 380 nm - 420 nm) 13000 µW/cm² = 130 W/m² VIS ( 380 nm - 780 nm) 327000 µW/cm² = 3270 W/m² PAR ( 400 nm - 700 nm) 315000 µW/cm² = 3150 W/m² blue ( 420 nm - 490 nm) 93200 µW/cm² = 932 W/m² green ( 490 nm - 575 nm) 115000 µW/cm² = 1150 W/m² yellow ( 575 nm - 585 nm) 13300 µW/cm² = 133 W/m² orange ( 585 nm - 650 nm) 81400 µW/cm² = 814 W/m² red ( 650 nm - 780 nm) 11200 µW/cm² = 112 W/m² IRA ( 700 nm - 1400 nm) 30800 µW/cm² = 308 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 333 UV-Index Pyrimidine dimerization of DNA 722 µW/cm² Photoceratitis 418 µW/cm² Photoconjunctivitis 686 µW/cm² DNA Damage 938 Vitamin D3 596 µW/cm² Photosynthesis 204000 µW/cm² Luminosity 1150000 lx Human L-Cone 171000 µW/cm² Human M-Cone 145000 µW/cm² Human S-Cone 68400 µW/cm² CIE X 144000 µW/cm² CIE Y 161000 µW/cm² CIE Z 127000 µW/cm² PAR 1410000000 mol photons Extinction preD3 9330 e-3*m²/mol Extinction Tachysterol 18600 e-3*m²/mol Exctincition PreD3 7060000 m²/mol Extinction Lumisterol 6070 m²/mol Exctincition Tachysterol 22300000 m²/mol Extinction 7DHC 6320 m²/mol L-Cone 139000 µW/cm² M-Cone 118000 µW/cm² S-Cone 117000 µW/cm² U-Cone 26400 µW/cm² UVR - ICNIRP 2004 686 Rel Biol Eff Melatonin Supression 94700 µW/cm² Blue Light Hazard 79700 µW/cm² (69 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 662 µW/cm² Lumen Reptil 993000 "pseudo-lx" Vitamin D3 Degradation 480 µW/cm² Actinic UV 689 µW/cm² (5.97 mW/klm) Exctincition Lumisterol 5570000 m²/mol Exctincition 7DHC 6250000 m²/mol Exctincition Toxisterols 4310000 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 2080 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 210 Leybold UVB 1080 µW/cm² Leybold UVA 6230 µW/cm² Leybold UVC 522 µW/cm² DeltaOhm UVB 2020 µW/cm² DeltaOhm UVC 972 µW/cm² Vernier UVB 803 µW/cm² Vernier UVA 4270 µW/cm² Gröbel UVA 6850 µW/cm² Gröbel UVB 919 µW/cm² Gröbel UVC 589 µW/cm² Solarmeter 6.4 (D3) 655 IU/min UVX-31 2540 µW/cm² IL UVB 0.89 µW/cm² IL UVA 6920 µW/cm² Solarmeter 6.5 (UVI, post 2010) 159 UV-Index Solarmeter 6.2 (UVB, post 2010) 989 µW/cm² (Solarmeter Ratio = 6.2) Solarmeter AlGaN 6.5 UVI sensor 1070 UV Index GenUV 7.1 UV-Index 73.3 UV-Index Solarmeter 10.0 (Global Power) 3650 W/m² Solarmeter 4.0 (UVA) 117 mW/cm² LS122 156 W/m² ISM400 2580 W/m²