Spectrum 481: BEC36 Edit
DeleteMeasurement
| Brand |
Exo Terra Rolf C. Hagen Inc. http://www.hagen.com/ |
|---|---|
| Lamp Product |
Reptile Vision 26watt Coil Lamp |
| Lamp ID |
BEC36 (09/2013) |
| Spectrometer | USB2000+ (2) |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 10 cm |
| Age | 1 hours |
| Originator (measurement) | Frances Baines |
Database entry created:
Frances Baines
9/Oct/2013 ; updated:
Frances Baines
9/Oct/2013
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.
WARNING: The measurement range (350 - 800 nm) is not sufficient for this evaluation! Data is only available in the range 300.12 - 750.24 nm. Results are shown anyway but should be ignored by anyone except experts.
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 | ( 0.34 ; 0.29 ) | ( 0.32 ; 0.53 ) | ( 0.27 ; 0.24 ; 0.38 ) |
| CCT | 5000 Kelvin | 6500 Kelvin | 5600 Kelvin |
| distance | 0.18 | 0.13 | |
| 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) 1620 µW/cm² = 16.2 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) 1620 µW/cm² = 16.2 W/m² UVB (EU) ( 280 nm - 315 nm) 1.11 µW/cm² = 0.0111 W/m² UVB (US) ( 280 nm - 320 nm) 1.11 µW/cm² = 0.0111 W/m² UVA+B ( 280 nm - 380 nm) 48.2 µW/cm² = 0.482 W/m² Solar UVB ( 290 nm - 315 nm) 1.11 µW/cm² = 0.0111 W/m² UVA D3 regulating ( 315 nm - 335 nm) 0.626 µW/cm² = 0.00626 W/m² UVA (EU) ( 315 nm - 380 nm) 47 µW/cm² = 0.47 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 1.42 µW/cm² = 0.0142 W/m² UVA (US) ( 320 nm - 380 nm) 47 µW/cm² = 0.47 W/m² UVA1 (variant) ( 335 nm - 380 nm) 46.4 µW/cm² = 0.464 W/m² UVA1 (medical) ( 340 nm - 400 nm) 50.6 µW/cm² = 0.506 W/m² vis. UVA ( 350 nm - 380 nm) 42.6 µW/cm² = 0.426 W/m² VIS Rep3 ( 350 nm - 600 nm) 1070 µW/cm² = 10.7 W/m² VIS Rep4 ( 350 nm - 700 nm) 1550 µW/cm² = 15.5 W/m² purple ( 380 nm - 420 nm) 108 µW/cm² = 1.08 W/m² VIS ( 380 nm - 780 nm) 1570 µW/cm² = 15.7 W/m² VIS2 ( 400 nm - 680 nm) 1410 µW/cm² = 14.1 W/m² PAR ( 400 nm - 700 nm) 1500 µW/cm² = 15 W/m² tmp ( 400 nm - 1100 nm) 1570 µW/cm² = 15.7 W/m² blue ( 420 nm - 490 nm) 431 µW/cm² = 4.31 W/m² green ( 490 nm - 575 nm) 381 µW/cm² = 3.81 W/m² yellow ( 575 nm - 585 nm) 38.2 µW/cm² = 0.382 W/m² orange ( 585 nm - 650 nm) 447 µW/cm² = 4.47 W/m² red ( 650 nm - 780 nm) 169 µW/cm² = 1.69 W/m² IRA ( 700 nm - 1400 nm) 66.2 µW/cm² = 0.662 W/m² IR2 ( 720 nm - 1100 nm) 0.228 µW/cm² = 0.00228 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 0.0252 UV-Index Pyrimidine dimerization of DNA 0.318 µW/cm² Photoceratitis 0.0481 µW/cm² Photoconjunctivitis 0 µW/cm² DNA Damage 0.000385 Vitamin D3 0.0853 µW/cm² Photosynthesis 1060 µW/cm² Luminosity 3950 lx Human L-Cone 608 µW/cm² Human M-Cone 458 µW/cm² Human S-Cone 390 µW/cm² CIE X 642 µW/cm² CIE Y 542 µW/cm² CIE Z 711 µW/cm² PAR 7330000 mol photons Extinction preD3 0.913 e-3*m²/mol Extinction Tachysterol 3.07 e-3*m²/mol Exctincition PreD3 461 m²/mol Extinction Lumisterol 0.012 m²/mol Exctincition Tachysterol 5000 m²/mol Extinction 7DHC 0 m²/mol L-Cone 518 µW/cm² M-Cone 444 µW/cm² S-Cone 722 µW/cm² U-Cone 205 µW/cm² UVR - ICNIRP 2004 0.0122 Rel Biol Eff Melatonin Supression 487 µW/cm² Blue Light Hazard 434 µW/cm² (110 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 0.0818 µW/cm² Lumen Reptil 4300 "pseudo-lx" Vitamin D3 Degradation 0.175 µW/cm² Actinic UV 0.0122 µW/cm² (0.0309 mW/klm) Exctincition Lumisterol 78.5 m²/mol Exctincition 7DHC 20.5 m²/mol Exctincition Toxisterols 101 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 1.23 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 0.0253 Leybold UVB 0.88 µW/cm² Leybold UVA 34.4 µW/cm² Leybold UVC 0 µW/cm² DeltaOhm UVB 1.86 µW/cm² DeltaOhm UVC 0.16 µW/cm² Vernier UVB 0.259 µW/cm² Vernier UVA 17.1 µW/cm² Gröbel UVA 40.3 µW/cm² Gröbel UVB 0.458 µW/cm² Gröbel UVC -0.000567 µW/cm² Luxmeter 3780 lx Solarmeter 6.4 (D3) 0.079 IU/min UVX-31 3.89 µW/cm² IL UVB 0.000589 µW/cm² IL UVA 44.2 µW/cm² Solarmeter 6.5 (UVI, post 2010) 0.0247 UV-Index Solarmeter 6.2 (UVB, post 2010) 0.617 µW/cm² (Solarmeter Ratio = 25) Solarmeter AlGaN 6.5 UVI sensor 0.646 UV Index GenUV 7.1 UV-Index 0.0413 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 16.5 W/m² Solarmeter 4.0 (UVA) 0.708 mW/cm² LS122 (manuf.) 0 W/m² ISM400 (first guess) 11.5 W/m² LS122 (assumption) 0.585 W/m² ISM400_new 9.44 W/m² Solarmeter 10.0 (Global Power) (assumption) 15.8 W/m²