Spectrum 533: BLR12 Edit
DeleteMeasurement
| Brand |
Lucky Reptile Import Export Peter Hoch http://www.hoch-rep.com/ |
|---|---|
| Lamp Product |
Bright Sun FLOOD Desert 70W PAR38 70° |
| Lamp ID |
BLR12 (12/2012) UVB metal halide |
| Spectrometer | USB2000+ (2) |
| Ballast | 70W EVG |
| Reflector | |
| Distance | 30 cm |
| Age | 105 hours |
| Originator (measurement) | Frances Baines |
Database entry created:
Frances Baines
20/Dec/2016 ; updated:
Frances Baines
20/Dec/2016
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 | ( 0.35 ; 0.35 ) | ( 0.29 ; 0.41 ) | ( 0.3 ; 0.2 ; 0.28 ) |
| CCT | 4800 Kelvin | 7900 Kelvin | 5200 Kelvin |
| distance | 0.067 | 0.084 | |
| 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) 51700 µW/cm² = 517 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) 51700 µW/cm² = 517 W/m² UVB (EU) ( 280 nm - 315 nm) 20.8 µW/cm² = 0.208 W/m² UVB (US) ( 280 nm - 320 nm) 30.9 µW/cm² = 0.309 W/m² UVA+B ( 280 nm - 380 nm) 3460 µW/cm² = 34.6 W/m² Solar UVB ( 290 nm - 315 nm) 20.8 µW/cm² = 0.208 W/m² UVA D3 regulating ( 315 nm - 335 nm) 120 µW/cm² = 1.2 W/m² UVA (EU) ( 315 nm - 380 nm) 3440 µW/cm² = 34.4 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 185 µW/cm² = 1.85 W/m² UVA (US) ( 320 nm - 380 nm) 3430 µW/cm² = 34.3 W/m² UVA1 (variant) ( 335 nm - 380 nm) 3320 µW/cm² = 33.2 W/m² UVA1 (medical) ( 340 nm - 400 nm) 4980 µW/cm² = 49.8 W/m² vis. UVA ( 350 nm - 380 nm) 3000 µW/cm² = 30 W/m² VIS Rep3 ( 350 nm - 600 nm) 33400 µW/cm² = 334 W/m² VIS Rep4 ( 350 nm - 700 nm) 43100 µW/cm² = 431 W/m² purple ( 380 nm - 420 nm) 4690 µW/cm² = 46.9 W/m² VIS ( 380 nm - 780 nm) 43300 µW/cm² = 433 W/m² PAR ( 400 nm - 700 nm) 38400 µW/cm² = 384 W/m² blue ( 420 nm - 490 nm) 8870 µW/cm² = 88.7 W/m² green ( 490 nm - 575 nm) 10900 µW/cm² = 109 W/m² yellow ( 575 nm - 585 nm) 1900 µW/cm² = 19 W/m² orange ( 585 nm - 650 nm) 9560 µW/cm² = 95.6 W/m² red ( 650 nm - 780 nm) 7400 µW/cm² = 74 W/m² IRA ( 700 nm - 1400 nm) 8150 µW/cm² = 81.5 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 1.16 UV-Index Pyrimidine dimerization of DNA 9.55 µW/cm² Photoceratitis 0.887 µW/cm² Photoconjunctivitis 0 µW/cm² DNA Damage 0.0103 Vitamin D3 1.62 µW/cm² Photosynthesis 26100 µW/cm² Luminosity 118000 lx Human L-Cone 17800 µW/cm² Human M-Cone 14200 µW/cm² Human S-Cone 7730 µW/cm² CIE X 16300 µW/cm² CIE Y 16400 µW/cm² CIE Z 13600 µW/cm² PAR 181000000 mol photons Extinction preD3 29.3 e-3*m²/mol Extinction Tachysterol 112 e-3*m²/mol Exctincition PreD3 21100 m²/mol Extinction Lumisterol 0.225 m²/mol Exctincition Tachysterol 277000 m²/mol Extinction 7DHC 0.000122 m²/mol L-Cone 15300 µW/cm² M-Cone 10300 µW/cm² S-Cone 14400 µW/cm² U-Cone 10800 µW/cm² UVR - ICNIRP 2004 0.663 Rel Biol Eff Melatonin Supression 10400 µW/cm² Blue Light Hazard 9440 µW/cm² (80.3 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 1.45 µW/cm² Lumen Reptil 117000 "pseudo-lx" Vitamin D3 Degradation 6.42 µW/cm² Actinic UV 0.664 µW/cm² (0.0565 mW/klm) Exctincition Lumisterol 1890 m²/mol Exctincition 7DHC 447 m²/mol Exctincition Toxisterols 7790 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 61.8 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 0.801 Leybold UVB 30.3 µW/cm² Leybold UVA 2610 µW/cm² Leybold UVC 0 µW/cm² DeltaOhm UVB 152 µW/cm² DeltaOhm UVC 10.7 µW/cm² Vernier UVB 4.92 µW/cm² Vernier UVA 1370 µW/cm² Gröbel UVA 2820 µW/cm² Gröbel UVB 14.1 µW/cm² Gröbel UVC -0.0145 µW/cm² Solarmeter 6.4 (D3) 2.5 IU/min UVX-31 299 µW/cm² IL UVB 0.0358 µW/cm² IL UVA 3220 µW/cm² Solarmeter 6.5 (UVI, post 2010) 0.654 UV-Index Solarmeter 6.2 (UVB, post 2010) 35 µW/cm² (Solarmeter Ratio = 53.5) Solarmeter AlGaN 6.5 UVI sensor 14.3 UV Index GenUV 7.1 UV-Index 1.68 UV-Index Solarmeter 10.0 (Global Power) 560 W/m² Solarmeter 4.0 (UVA) 53.6 mW/cm² LS122 6.7 W/m² ISM400 454 W/m²