Spectrum 285: BESU6 Edit
DeleteMeasurement
| Brand |
Esu Birdlife Esu Birdlife |
|---|---|
| Lamp Product |
7% Desert T8 |
| Lamp ID |
BESU6 (02/2008) in Slimline Fixture |
| Spectrometer | USB 2000 |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 10 cm |
| Age | 5 hours |
| Originator (measurement) | Frances Baines |
Database entry created:
Maren
17/Jun/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 | ( 0.3 ; 0.31 ) | ( 0.41 ; 0.51 ) | ( 0.28 ; 0.3 ; 0.36 ) |
| CCT | 7200 Kelvin | 5000 Kelvin | 5100 Kelvin |
| distance | 0.17 | 0.12 | |
| 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) 854 µW/cm² = 8.54 W/m² UVC ( 0 nm - 280 nm) 0.996 µW/cm² = 0.00996 W/m² non-terrestrial ( 0 nm - 290 nm) 1.06 µW/cm² = 0.0106 W/m² total2 ( 250 nm - 880 nm) 854 µW/cm² = 8.54 W/m² UVB (EU) ( 280 nm - 315 nm) 0.391 µW/cm² = 0.00391 W/m² UVB (US) ( 280 nm - 320 nm) 0.426 µW/cm² = 0.00426 W/m² UVA+B ( 280 nm - 380 nm) 0.606 µW/cm² = 0.00606 W/m² Solar UVB ( 290 nm - 315 nm) 0.329 µW/cm² = 0.00329 W/m² UVA D3 regulating ( 315 nm - 335 nm) 0.0711 µW/cm² = 0.000711 W/m² UVA (EU) ( 315 nm - 380 nm) 0.213 µW/cm² = 0.00213 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 0.0469 µW/cm² = 0.000469 W/m² UVA (US) ( 320 nm - 380 nm) 0.179 µW/cm² = 0.00179 W/m² UVA1 (variant) ( 335 nm - 380 nm) 0.142 µW/cm² = 0.00142 W/m² UVA1 (medical) ( 340 nm - 400 nm) 2.23 µW/cm² = 0.0223 W/m² vis. UVA ( 350 nm - 380 nm) 0.0932 µW/cm² = 0.000932 W/m² VIS Rep3 ( 350 nm - 600 nm) 609 µW/cm² = 6.09 W/m² VIS Rep4 ( 350 nm - 700 nm) 801 µW/cm² = 8.01 W/m² purple ( 380 nm - 420 nm) 43.6 µW/cm² = 0.436 W/m² VIS ( 380 nm - 780 nm) 844 µW/cm² = 8.44 W/m² VIS2 ( 400 nm - 680 nm) 773 µW/cm² = 7.73 W/m² PAR ( 400 nm - 700 nm) 798 µW/cm² = 7.98 W/m² tmp ( 400 nm - 1100 nm) 850 µW/cm² = 8.5 W/m² blue ( 420 nm - 490 nm) 244 µW/cm² = 2.44 W/m² green ( 490 nm - 575 nm) 250 µW/cm² = 2.5 W/m² yellow ( 575 nm - 585 nm) 35.7 µW/cm² = 0.357 W/m² orange ( 585 nm - 650 nm) 151 µW/cm² = 1.51 W/m² red ( 650 nm - 780 nm) 121 µW/cm² = 1.21 W/m² IRA ( 700 nm - 1400 nm) 51.5 µW/cm² = 0.515 W/m² IR2 ( 720 nm - 1100 nm) 33.8 µW/cm² = 0.338 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 0.466 UV-Index Pyrimidine dimerization of DNA 0.221 µW/cm² Photoceratitis 0.401 µW/cm² Photoconjunctivitis 0.879 µW/cm² DNA Damage 0.949 Vitamin D3 0.368 µW/cm² Photosynthesis 564 µW/cm² Luminosity 2220 lx Human L-Cone 328 µW/cm² Human M-Cone 283 µW/cm² Human S-Cone 203 µW/cm² CIE X 298 µW/cm² CIE Y 307 µW/cm² CIE Z 376 µW/cm² PAR 3740000 mol photons Extinction preD3 9.26 e-3*m²/mol Extinction Tachysterol 19.2 e-3*m²/mol Exctincition PreD3 8780 m²/mol Extinction Lumisterol 7.68 m²/mol Exctincition Tachysterol 23400 m²/mol Extinction 7DHC 8.96 m²/mol L-Cone 273 µW/cm² M-Cone 285 µW/cm² S-Cone 351 µW/cm² U-Cone 56 µW/cm² UVR - ICNIRP 2004 0.875 Rel Biol Eff Melatonin Supression 276 µW/cm² Blue Light Hazard 227 µW/cm² (102 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 0.37 µW/cm² Lumen Reptil 2270 "pseudo-lx" Vitamin D3 Degradation 0.335 µW/cm² Actinic UV 0.871 µW/cm² (3.93 mW/klm) Exctincition Lumisterol 8150 m²/mol Exctincition 7DHC 9140 m²/mol Exctincition Toxisterols 3770 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 1.6 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 0.143 Leybold UVB 0.337 µW/cm² Leybold UVA 0.262 µW/cm² Leybold UVC 0.764 µW/cm² DeltaOhm UVB 0.408 µW/cm² DeltaOhm UVC 0.837 µW/cm² Vernier UVB 0.252 µW/cm² Vernier UVA 0.191 µW/cm² Gröbel UVA 0.199 µW/cm² Gröbel UVB 0.454 µW/cm² Gröbel UVC 0.811 µW/cm² Luxmeter 2280 lx Solarmeter 6.4 (D3) 0.447 IU/min UVX-31 0.497 µW/cm² IL UVB 0.000495 µW/cm² IL UVA 0.189 µW/cm² Solarmeter 6.5 (UVI, post 2010) 0.143 UV-Index Solarmeter 6.2 (UVB, post 2010) 0.528 µW/cm² (Solarmeter Ratio = 3.69) Solarmeter AlGaN 6.5 UVI sensor 0.518 UV Index GenUV 7.1 UV-Index 0.0543 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 8.9 W/m² Solarmeter 4.0 (UVA) 0.0588 mW/cm² LS122 (manuf.) 0.00345 W/m² ISM400 (first guess) 6.38 W/m² LS122 (assumption) 0.307 W/m² ISM400_new 5.28 W/m² Solarmeter 10.0 (Global Power) (assumption) 8.57 W/m²