Spectrum 25: BFE2 Edit
DeleteMeasurement
| Brand |
Ferplast Ferplast S.p.A. http://www.ferplast.com |
|---|---|
| Lamp Product |
Desert Lamp T8 18W 10% UVB |
| Lamp ID |
BFE2 (11/2007) Lamp type associated with PKC |
| Spectrometer | USB 2000 |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 10 cm |
| Age | 1 hours |
| Originator (measurement) | Frances Baines |
Database entry created:
Sarina Wunderlich
12/Nov/2009 ; updated:
Sarina Wunderlich
9/Oct/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.
WARNING: The measurement range (350 - 800 nm) is not sufficient for this evaluation! Data is only available in the range 250.17 - 780.01 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 | ( 0.27 ; 0.32 ) | ( 0.36 ; 0.45 ) | ( 0.22 ; 0.28 ; 0.35 ) |
| CCT | 9700 Kelvin | 5800 Kelvin | 6400 Kelvin |
| distance | 0.11 | 0.091 | |
| 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) 700 µW/cm² = 7 W/m² UVC ( 0 nm - 280 nm) 2.01 µW/cm² = 0.0201 W/m² non-terrestrial ( 0 nm - 290 nm) 10.5 µW/cm² = 0.105 W/m² total2 ( 250 nm - 880 nm) 700 µW/cm² = 7 W/m² UVB (EU) ( 280 nm - 315 nm) 105 µW/cm² = 1.05 W/m² UVB (US) ( 280 nm - 320 nm) 121 µW/cm² = 1.21 W/m² UVA+B ( 280 nm - 380 nm) 182 µW/cm² = 1.82 W/m² Solar UVB ( 290 nm - 315 nm) 97 µW/cm² = 0.97 W/m² UVA D3 regulating ( 315 nm - 335 nm) 42.4 µW/cm² = 0.424 W/m² UVA (EU) ( 315 nm - 380 nm) 77 µW/cm² = 0.77 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 30.9 µW/cm² = 0.309 W/m² UVA (US) ( 320 nm - 380 nm) 61.1 µW/cm² = 0.611 W/m² UVA1 (variant) ( 335 nm - 380 nm) 34.6 µW/cm² = 0.346 W/m² UVA1 (medical) ( 340 nm - 400 nm) 40.3 µW/cm² = 0.403 W/m² vis. UVA ( 350 nm - 380 nm) 24.5 µW/cm² = 0.245 W/m² VIS Rep3 ( 350 nm - 600 nm) 438 µW/cm² = 4.38 W/m² VIS Rep4 ( 350 nm - 700 nm) 520 µW/cm² = 5.2 W/m² purple ( 380 nm - 420 nm) 46.9 µW/cm² = 0.469 W/m² VIS ( 380 nm - 780 nm) 515 µW/cm² = 5.15 W/m² PAR ( 400 nm - 700 nm) 485 µW/cm² = 4.85 W/m² blue ( 420 nm - 490 nm) 157 µW/cm² = 1.57 W/m² green ( 490 nm - 575 nm) 174 µW/cm² = 1.74 W/m² yellow ( 575 nm - 585 nm) 20.2 µW/cm² = 0.202 W/m² orange ( 585 nm - 650 nm) 63.7 µW/cm² = 0.637 W/m² red ( 650 nm - 780 nm) 53.7 µW/cm² = 0.537 W/m² IRA ( 700 nm - 1400 nm) 20.2 µW/cm² = 0.202 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 20.2 UV-Index Pyrimidine dimerization of DNA 60.6 µW/cm² Photoceratitis 31.2 µW/cm² Photoconjunctivitis 3.97 µW/cm² DNA Damage 8.65 Vitamin D3 60.2 µW/cm² Photosynthesis 337 µW/cm² Luminosity 1360 lx Human L-Cone 196 µW/cm² Human M-Cone 185 µW/cm² Human S-Cone 135 µW/cm² CIE X 162 µW/cm² CIE Y 191 µW/cm² CIE Z 249 µW/cm² PAR 2290000 mol photons Extinction preD3 269 e-3*m²/mol Extinction Tachysterol 970 e-3*m²/mol Exctincition PreD3 160000 m²/mol Extinction Lumisterol 167 m²/mol Exctincition Tachysterol 1240000 m²/mol Extinction 7DHC 214 m²/mol L-Cone 155 µW/cm² M-Cone 191 µW/cm² S-Cone 242 µW/cm² U-Cone 101 µW/cm² UVR - ICNIRP 2004 25.9 Rel Biol Eff Melatonin Supression 183 µW/cm² Blue Light Hazard 153 µW/cm² (112 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 63.7 µW/cm² Lumen Reptil 1540 "pseudo-lx" Vitamin D3 Degradation 34.5 µW/cm² Actinic UV 25.6 µW/cm² (188 mW/klm) Exctincition Lumisterol 197000 m²/mol Exctincition 7DHC 250000 m²/mol Exctincition Toxisterols 19700 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 146 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 18.3 Leybold UVB 100 µW/cm² Leybold UVA 37.4 µW/cm² Leybold UVC 1.44 µW/cm² DeltaOhm UVB 122 µW/cm² DeltaOhm UVC 26.1 µW/cm² Vernier UVB 64 µW/cm² Vernier UVA 63.5 µW/cm² Gröbel UVA 65.9 µW/cm² Gröbel UVB 83 µW/cm² Gröbel UVC 1.8 µW/cm² Solarmeter 6.4 (D3) 57.3 IU/min UVX-31 131 µW/cm² IL UVB 0.0659 µW/cm² IL UVA 50.7 µW/cm² Solarmeter 6.5 (UVI, post 2010) 12 UV-Index Solarmeter 6.2 (UVB, post 2010) 71.2 µW/cm² (Solarmeter Ratio = 5.94) Solarmeter AlGaN 6.5 UVI sensor 92.5 UV Index GenUV 7.1 UV-Index 4.69 UV-Index Solarmeter 10.0 (Global Power) 5.71 W/m² Solarmeter 4.0 (UVA) 0.8 mW/cm² LS122 0 W/m² ISM400 3.38 W/m²