Spectrum 325: BRO1 Edit
DeleteMeasurement
| Brand |
Reptile One http://www.reptileone.com. |
|---|---|
| Lamp Product |
UVB 10.0 T8 18W |
| Lamp ID |
BRO1 (08/2009) |
| Spectrometer | USB2000+ (2) |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 10 cm |
| Age | 105 hours |
| Originator (measurement) | Frances Baines |
Database entry created:
Sarina Wunderlich
3/Jul/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 ; 0.28 ) | ( 0.21 ; 0.38 ) | ( 0.18 ; 0.18 ; 0.32 ) |
| CCT | 9000 Kelvin | 15000 Kelvin | 11000 Kelvin |
| distance | 0.063 | 0.06 | |
| 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) 828 µW/cm² = 8.28 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) 828 µW/cm² = 8.28 W/m² UVB (EU) ( 280 nm - 315 nm) 53 µW/cm² = 0.53 W/m² UVB (US) ( 280 nm - 320 nm) 76.7 µW/cm² = 0.767 W/m² UVA+B ( 280 nm - 380 nm) 368 µW/cm² = 3.68 W/m² Solar UVB ( 290 nm - 315 nm) 53 µW/cm² = 0.53 W/m² UVA D3 regulating ( 315 nm - 335 nm) 110 µW/cm² = 1.1 W/m² UVA (EU) ( 315 nm - 380 nm) 315 µW/cm² = 3.15 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 119 µW/cm² = 1.19 W/m² UVA (US) ( 320 nm - 380 nm) 291 µW/cm² = 2.91 W/m² UVA1 (variant) ( 335 nm - 380 nm) 205 µW/cm² = 2.05 W/m² UVA1 (medical) ( 340 nm - 400 nm) 199 µW/cm² = 1.99 W/m² vis. UVA ( 350 nm - 380 nm) 115 µW/cm² = 1.15 W/m² VIS Rep3 ( 350 nm - 600 nm) 460 µW/cm² = 4.6 W/m² VIS Rep4 ( 350 nm - 700 nm) 552 µW/cm² = 5.52 W/m² purple ( 380 nm - 420 nm) 64.5 µW/cm² = 0.645 W/m² VIS ( 380 nm - 780 nm) 456 µW/cm² = 4.56 W/m² PAR ( 400 nm - 700 nm) 410 µW/cm² = 4.1 W/m² blue ( 420 nm - 490 nm) 134 µW/cm² = 1.34 W/m² green ( 490 nm - 575 nm) 113 µW/cm² = 1.13 W/m² yellow ( 575 nm - 585 nm) 16.4 µW/cm² = 0.164 W/m² orange ( 585 nm - 650 nm) 70.7 µW/cm² = 0.707 W/m² red ( 650 nm - 780 nm) 57.6 µW/cm² = 0.576 W/m² IRA ( 700 nm - 1400 nm) 23.8 µW/cm² = 0.238 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 3.71 UV-Index Pyrimidine dimerization of DNA 31.6 µW/cm² Photoceratitis 5.56 µW/cm² Photoconjunctivitis 0.111 µW/cm² DNA Damage 0.406 Vitamin D3 15.3 µW/cm² Photosynthesis 295 µW/cm² Luminosity 1030 lx Human L-Cone 153 µW/cm² Human M-Cone 131 µW/cm² Human S-Cone 119 µW/cm² CIE X 148 µW/cm² CIE Y 143 µW/cm² CIE Z 215 µW/cm² PAR 1990000 mol photons Extinction preD3 89.5 e-3*m²/mol Extinction Tachysterol 317 e-3*m²/mol Exctincition PreD3 42800 m²/mol Extinction Lumisterol 16.7 m²/mol Exctincition Tachysterol 450000 m²/mol Extinction 7DHC 16.5 m²/mol L-Cone 127 µW/cm² M-Cone 124 µW/cm² S-Cone 222 µW/cm² U-Cone 231 µW/cm² UVR - ICNIRP 2004 3.17 Rel Biol Eff Melatonin Supression 150 µW/cm² Blue Light Hazard 137 µW/cm² (133 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 16.7 µW/cm² Lumen Reptil 1430 "pseudo-lx" Vitamin D3 Degradation 15.5 µW/cm² Actinic UV 3.12 µW/cm² (30.3 mW/klm) Exctincition Lumisterol 22900 m²/mol Exctincition 7DHC 21400 m²/mol Exctincition Toxisterols 6950 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 92 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 4.36 Leybold UVB 67.3 µW/cm² Leybold UVA 211 µW/cm² Leybold UVC 0.00771 µW/cm² DeltaOhm UVB 151 µW/cm² DeltaOhm UVC 18.4 µW/cm² Vernier UVB 25.8 µW/cm² Vernier UVA 215 µW/cm² Gröbel UVA 267 µW/cm² Gröbel UVB 35.9 µW/cm² Gröbel UVC -0.0295 µW/cm² Solarmeter 6.4 (D3) 13.6 IU/min UVX-31 167 µW/cm² IL UVB 0.0396 µW/cm² IL UVA 240 µW/cm² Solarmeter 6.5 (UVI, post 2010) 3.49 UV-Index Solarmeter 6.2 (UVB, post 2010) 59.8 µW/cm² (Solarmeter Ratio = 17.1) Solarmeter AlGaN 6.5 UVI sensor 43.8 UV Index GenUV 7.1 UV-Index 2.4 UV-Index Solarmeter 10.0 (Global Power) 6.04 W/m² Solarmeter 4.0 (UVA) 3.21 mW/cm² LS122 0.00161 W/m² ISM400 3.25 W/m²