Spectrum 287: BESU6 Edit
DeleteMeasurement
| Brand |
Esu Birdlife Esu Birdlife |
|---|---|
| Lamp Product |
7% Desert T8 |
| Lamp ID |
BESU6 (02/2008) in Slimline Fixture |
| Spectrometer | USB2000+ |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 10 cm |
| Age | 105 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 | ( 0.29 ; 0.3 ) | ( 0.39 ; 0.53 ) | ( 0.27 ; 0.29 ; 0.39 ) |
| CCT | 8300 Kelvin | 5200 Kelvin | 5400 Kelvin |
| distance | 0.19 | 0.14 | |
| 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) 706 µW/cm² = 7.06 W/m² UVC ( 0 nm - 280 nm) 0.0421 µW/cm² = 0.000421 W/m² non-terrestrial ( 0 nm - 290 nm) 0.0421 µW/cm² = 0.000421 W/m² total2 ( 250 nm - 880 nm) 706 µW/cm² = 7.06 W/m² UVB (EU) ( 280 nm - 315 nm) 0 µW/cm² = 0 W/m² UVB (US) ( 280 nm - 320 nm) 0 µW/cm² = 0 W/m² UVA+B ( 280 nm - 380 nm) 0 µW/cm² = 0 W/m² Solar UVB ( 290 nm - 315 nm) 0 µW/cm² = 0 W/m² UVA D3 regulating ( 315 nm - 335 nm) 0 µW/cm² = 0 W/m² UVA (EU) ( 315 nm - 380 nm) 0 µW/cm² = 0 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 0 µW/cm² = 0 W/m² UVA (US) ( 320 nm - 380 nm) 0 µW/cm² = 0 W/m² UVA1 (variant) ( 335 nm - 380 nm) 0 µW/cm² = 0 W/m² UVA1 (medical) ( 340 nm - 400 nm) 1.19 µW/cm² = 0.0119 W/m² vis. UVA ( 350 nm - 380 nm) 0 µW/cm² = 0 W/m² VIS Rep3 ( 350 nm - 600 nm) 519 µW/cm² = 5.19 W/m² VIS Rep4 ( 350 nm - 700 nm) 669 µW/cm² = 6.69 W/m² purple ( 380 nm - 420 nm) 38.2 µW/cm² = 0.382 W/m² VIS ( 380 nm - 780 nm) 701 µW/cm² = 7.01 W/m² VIS2 ( 400 nm - 680 nm) 648 µW/cm² = 6.48 W/m² PAR ( 400 nm - 700 nm) 667 µW/cm² = 6.67 W/m² tmp ( 400 nm - 1100 nm) 705 µW/cm² = 7.05 W/m² blue ( 420 nm - 490 nm) 221 µW/cm² = 2.21 W/m² green ( 490 nm - 575 nm) 202 µW/cm² = 2.02 W/m² yellow ( 575 nm - 585 nm) 29.2 µW/cm² = 0.292 W/m² orange ( 585 nm - 650 nm) 119 µW/cm² = 1.19 W/m² red ( 650 nm - 780 nm) 91.7 µW/cm² = 0.917 W/m² IRA ( 700 nm - 1400 nm) 37.7 µW/cm² = 0.377 W/m² IR2 ( 720 nm - 1100 nm) 24.1 µW/cm² = 0.241 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 0.0169 UV-Index Pyrimidine dimerization of DNA 0 µW/cm² Photoceratitis 0.00963 µW/cm² Photoconjunctivitis 0.0382 µW/cm² DNA Damage 0.0421 Vitamin D3 0 µW/cm² Photosynthesis 477 µW/cm² Luminosity 1800 lx Human L-Cone 266 µW/cm² Human M-Cone 231 µW/cm² Human S-Cone 184 µW/cm² CIE X 246 µW/cm² CIE Y 249 µW/cm² CIE Z 341 µW/cm² PAR 3120000 mol photons Extinction preD3 0.351 e-3*m²/mol Extinction Tachysterol 0.364 e-3*m²/mol Exctincition PreD3 351 m²/mol Extinction Lumisterol 0.2 m²/mol Exctincition Tachysterol 418 m²/mol Extinction 7DHC 0.187 m²/mol L-Cone 220 µW/cm² M-Cone 240 µW/cm² S-Cone 320 µW/cm² U-Cone 47.7 µW/cm² UVR - ICNIRP 2004 0.0195 Rel Biol Eff Melatonin Supression 245 µW/cm² Blue Light Hazard 205 µW/cm² (114 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 0 µW/cm² Lumen Reptil 1930 "pseudo-lx" Vitamin D3 Degradation 0 µW/cm² Actinic UV 0.0195 µW/cm² (0.108 mW/klm) Exctincition Lumisterol 173 m²/mol Exctincition 7DHC 173 m²/mol Exctincition Toxisterols 368 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 0.0265 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 5.25E-6 Leybold UVB 0 µW/cm² Leybold UVA 0.065 µW/cm² Leybold UVC 0.0401 µW/cm² DeltaOhm UVB 0.000275 µW/cm² DeltaOhm UVC 0.0419 µW/cm² Vernier UVB 0 µW/cm² Vernier UVA -1.46E-5 µW/cm² Gröbel UVA -0.00909 µW/cm² Gröbel UVB 6.67E-5 µW/cm² Gröbel UVC 0.0363 µW/cm² Luxmeter 1860 lx Solarmeter 6.4 (D3) 1.64E-5 IU/min UVX-31 0 µW/cm² IL UVB 2.45E-6 µW/cm² IL UVA 0.00735 µW/cm² Solarmeter 6.5 (UVI, post 2010) 0.00267 UV-Index Solarmeter 6.2 (UVB, post 2010) 0.00673 µW/cm² (Solarmeter Ratio = 2.53) Solarmeter AlGaN 6.5 UVI sensor 0.000102 UV Index GenUV 7.1 UV-Index 0.0014 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 7.25 W/m² Solarmeter 4.0 (UVA) 0.0441 mW/cm² LS122 (manuf.) 0.0022 W/m² ISM400 (first guess) 5.09 W/m² LS122 (assumption) 0.241 W/m² ISM400_new 4.18 W/m² Solarmeter 10.0 (Global Power) (assumption) 6.94 W/m²