Spectrum 534: BRTL5 Edit
DeleteMeasurement
| Brand |
RepTielenLampen.nl |
|---|---|
| Lamp Product |
The White Light HQI Flood Desert |
| Lamp ID |
BRTL5 (07/2015) 150W metal halide |
| Spectrometer | USB2000+ (2) |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 30 cm |
| Age | 105 hours |
| Originator (measurement) | Frances Baines |
Database entry created:
Frances Baines
21/Dec/2016 ; updated:
Frances Baines
21/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 | ( 0.25 ; 0.24 ) | ( 0.16 ; 0.4 ) | ( 0.12 ; 0.14 ; 0.36 ) |
| CCT | 45000 Kelvin | 35000 Kelvin | 210000 Kelvin |
| distance | 0.099 | 0.086 | |
| 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) 29300 µW/cm² = 293 W/m² UVC ( 0 nm - 280 nm) 0 µW/cm² = 0 W/m² non-terrestrial ( 0 nm - 290 nm) 0.0296 µW/cm² = 0.000296 W/m² total2 ( 250 nm - 880 nm) 29300 µW/cm² = 293 W/m² UVB (EU) ( 280 nm - 315 nm) 126 µW/cm² = 1.26 W/m² UVB (US) ( 280 nm - 320 nm) 156 µW/cm² = 1.56 W/m² UVA+B ( 280 nm - 380 nm) 5130 µW/cm² = 51.3 W/m² Solar UVB ( 290 nm - 315 nm) 126 µW/cm² = 1.26 W/m² UVA D3 regulating ( 315 nm - 335 nm) 268 µW/cm² = 2.68 W/m² UVA (EU) ( 315 nm - 380 nm) 5000 µW/cm² = 50 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 392 µW/cm² = 3.92 W/m² UVA (US) ( 320 nm - 380 nm) 4970 µW/cm² = 49.7 W/m² UVA1 (variant) ( 335 nm - 380 nm) 4740 µW/cm² = 47.4 W/m² UVA1 (medical) ( 340 nm - 400 nm) 7020 µW/cm² = 70.2 W/m² vis. UVA ( 350 nm - 380 nm) 4130 µW/cm² = 41.3 W/m² VIS Rep3 ( 350 nm - 600 nm) 24100 µW/cm² = 241 W/m² VIS Rep4 ( 350 nm - 700 nm) 26100 µW/cm² = 261 W/m² purple ( 380 nm - 420 nm) 6030 µW/cm² = 60.3 W/m² VIS ( 380 nm - 780 nm) 22800 µW/cm² = 228 W/m² PAR ( 400 nm - 700 nm) 19500 µW/cm² = 195 W/m² blue ( 420 nm - 490 nm) 7820 µW/cm² = 78.2 W/m² green ( 490 nm - 575 nm) 4420 µW/cm² = 44.2 W/m² yellow ( 575 nm - 585 nm) 1280 µW/cm² = 12.8 W/m² orange ( 585 nm - 650 nm) 1520 µW/cm² = 15.2 W/m² red ( 650 nm - 780 nm) 1760 µW/cm² = 17.6 W/m² IRA ( 700 nm - 1400 nm) 2170 µW/cm² = 21.7 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 5.74 UV-Index Pyrimidine dimerization of DNA 55.3 µW/cm² Photoceratitis 8.53 µW/cm² Photoconjunctivitis 0.0983 µW/cm² DNA Damage 0.385 Vitamin D3 20.8 µW/cm² Photosynthesis 14600 µW/cm² Luminosity 41700 lx Human L-Cone 6020 µW/cm² Human M-Cone 5600 µW/cm² Human S-Cone 7120 µW/cm² CIE X 6010 µW/cm² CIE Y 5730 µW/cm² CIE Z 12200 µW/cm² PAR 91700000 mol photons Extinction preD3 159 e-3*m²/mol Extinction Tachysterol 560 e-3*m²/mol Exctincition PreD3 84600 m²/mol Extinction Lumisterol 16.2 m²/mol Exctincition Tachysterol 948000 m²/mol Extinction 7DHC 13.5 m²/mol L-Cone 4780 µW/cm² M-Cone 5640 µW/cm² S-Cone 14000 µW/cm² U-Cone 14900 µW/cm² UVR - ICNIRP 2004 4.13 Rel Biol Eff Melatonin Supression 9000 µW/cm² Blue Light Hazard 8770 µW/cm² (210 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 21.8 µW/cm² Lumen Reptil 77500 "pseudo-lx" Vitamin D3 Degradation 29.7 µW/cm² Actinic UV 4.05 µW/cm² (0.972 mW/klm) Exctincition Lumisterol 26900 m²/mol Exctincition 7DHC 19000 m²/mol Exctincition Toxisterols 19100 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 206 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 6.2 Leybold UVB 137 µW/cm² Leybold UVA 3740 µW/cm² Leybold UVC 0.00506 µW/cm² DeltaOhm UVB 400 µW/cm² DeltaOhm UVC 36.5 µW/cm² Vernier UVB 40.9 µW/cm² Vernier UVA 2050 µW/cm² Gröbel UVA 4100 µW/cm² Gröbel UVB 71.4 µW/cm² Gröbel UVC -0.0559 µW/cm² Solarmeter 6.4 (D3) 19.4 IU/min UVX-31 610 µW/cm² IL UVB 0.0997 µW/cm² IL UVA 4650 µW/cm² Solarmeter 6.5 (UVI, post 2010) 5.21 UV-Index Solarmeter 6.2 (UVB, post 2010) 122 µW/cm² (Solarmeter Ratio = 23.4) Solarmeter AlGaN 6.5 UVI sensor 86.9 UV Index GenUV 7.1 UV-Index 5.84 UV-Index Solarmeter 10.0 (Global Power) 243 W/m² Solarmeter 4.0 (UVA) 77.6 mW/cm² LS122 2.03 W/m² ISM400 150 W/m²