Spectrum 121: BLR4 Edit
DeleteMeasurement
| Brand |
Lucky Reptile Import Export Peter Hoch http://www.hoch-rep.com/ |
|---|---|
| Lamp Product |
Bright Sun UV Jungle 70W PAR38 30° |
| Lamp ID |
BLR4 (07/2008) |
| Spectrometer | USB 2000 |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 30 cm |
| Age | 105 hours |
| Originator (measurement) | Frances Baines |
Database entry created:
Sarina Wunderlich
8/Mar/2010 ; updated:
Sarina Wunderlich
4/Jul/2014
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 | ( 0.33 ; 0.33 ) | ( 0.21 ; 0.36 ) | ( 0.22 ; 0.17 ; 0.28 ) |
| CCT | 5800 Kelvin | 16000 Kelvin | 8500 Kelvin |
| distance | 0.043 | 0.078 | |
| 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) 24100 µW/cm² = 241 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) 24100 µW/cm² = 241 W/m² UVB (EU) ( 280 nm - 315 nm) 52.8 µW/cm² = 0.528 W/m² UVB (US) ( 280 nm - 320 nm) 71.9 µW/cm² = 0.719 W/m² UVA+B ( 280 nm - 380 nm) 3320 µW/cm² = 33.2 W/m² Solar UVB ( 290 nm - 315 nm) 52.8 µW/cm² = 0.528 W/m² UVA D3 regulating ( 315 nm - 335 nm) 169 µW/cm² = 1.69 W/m² UVA (EU) ( 315 nm - 380 nm) 3270 µW/cm² = 32.7 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 255 µW/cm² = 2.55 W/m² UVA (US) ( 320 nm - 380 nm) 3250 µW/cm² = 32.5 W/m² UVA1 (variant) ( 335 nm - 380 nm) 3100 µW/cm² = 31 W/m² UVA1 (medical) ( 340 nm - 400 nm) 4490 µW/cm² = 44.9 W/m² vis. UVA ( 350 nm - 380 nm) 2710 µW/cm² = 27.1 W/m² VIS Rep3 ( 350 nm - 600 nm) 17700 µW/cm² = 177 W/m² VIS Rep4 ( 350 nm - 700 nm) 20500 µW/cm² = 205 W/m² purple ( 380 nm - 420 nm) 3580 µW/cm² = 35.8 W/m² VIS ( 380 nm - 780 nm) 18700 µW/cm² = 187 W/m² PAR ( 400 nm - 700 nm) 16300 µW/cm² = 163 W/m² blue ( 420 nm - 490 nm) 4310 µW/cm² = 43.1 W/m² green ( 490 nm - 575 nm) 4510 µW/cm² = 45.1 W/m² yellow ( 575 nm - 585 nm) 864 µW/cm² = 8.64 W/m² orange ( 585 nm - 650 nm) 3360 µW/cm² = 33.6 W/m² red ( 650 nm - 780 nm) 2120 µW/cm² = 21.2 W/m² IRA ( 700 nm - 1400 nm) 2970 µW/cm² = 29.7 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 2.32 UV-Index Pyrimidine dimerization of DNA 25.4 µW/cm² Photoceratitis 3.17 µW/cm² Photoconjunctivitis 0.0215 µW/cm² DNA Damage 0.08 Vitamin D3 7.79 µW/cm² Photosynthesis 11200 µW/cm² Luminosity 47600 lx Human L-Cone 7110 µW/cm² Human M-Cone 5920 µW/cm² Human S-Cone 3940 µW/cm² CIE X 6450 µW/cm² CIE Y 6620 µW/cm² CIE Z 6730 µW/cm² PAR 76400000 mol photons Extinction preD3 71.5 e-3*m²/mol Extinction Tachysterol 256 e-3*m²/mol Exctincition PreD3 40900 m²/mol Extinction Lumisterol 3.99 m²/mol Exctincition Tachysterol 489000 m²/mol Extinction 7DHC 1.81 m²/mol L-Cone 5980 µW/cm² M-Cone 4490 µW/cm² S-Cone 7640 µW/cm² U-Cone 8840 µW/cm² UVR - ICNIRP 2004 1.41 Rel Biol Eff Melatonin Supression 5250 µW/cm² Blue Light Hazard 4950 µW/cm² (104 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 8.29 µW/cm² Lumen Reptil 57600 "pseudo-lx" Vitamin D3 Degradation 14 µW/cm² Actinic UV 1.4 µW/cm² (0.294 mW/klm) Exctincition Lumisterol 8460 m²/mol Exctincition 7DHC 3250 m²/mol Exctincition Toxisterols 11400 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 105 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 2.47 Leybold UVB 65.5 µW/cm² Leybold UVA 2500 µW/cm² Leybold UVC 0 µW/cm² DeltaOhm UVB 230 µW/cm² DeltaOhm UVC 19.9 µW/cm² Vernier UVB 17.3 µW/cm² Vernier UVA 1420 µW/cm² Gröbel UVA 2700 µW/cm² Gröbel UVB 32.6 µW/cm² Gröbel UVC -0.0216 µW/cm² Solarmeter 6.4 (D3) 7.72 IU/min UVX-31 382 µW/cm² IL UVB 0.0548 µW/cm² IL UVA 3040 µW/cm² Solarmeter 6.5 (UVI, post 2010) 2.16 UV-Index Solarmeter 6.2 (UVB, post 2010) 64.4 µW/cm² (Solarmeter Ratio = 29.8) Solarmeter AlGaN 6.5 UVI sensor 38.3 UV Index GenUV 7.1 UV-Index 2.85 UV-Index Solarmeter 10.0 (Global Power) 233 W/m² Solarmeter 4.0 (UVA) 49.4 mW/cm² LS122 2.87 W/m² ISM400 172 W/m²