ExoTerra SunRay 70watt metal halide lamp
Spectrum 529: BEMH3 Edit
DeleteMeasurement
| Brand |
Exo Terra Rolf C. Hagen Inc. http://www.hagen.com/ |
|---|---|
| Lamp Product |
SunRay ExoTerra Sunray 70W metal halide |
| Lamp ID |
BEMH3 (10/2013) ExoTerra Sunray 70W metal halide lamp |
| Spectrometer | USB2000+ |
| Ballast | 70W EVG |
| Reflector | |
| Distance | 30 cm |
| Age | 105 hours |
| Originator (measurement) | Frances Baines |
Database entry created:
Frances Baines
20/Oct/2016 ; updated:
Sarina Wunderlich
25/Oct/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 | ( 0.3 ; 0.3 ) | ( 0.24 ; 0.39 ) | ( 0.19 ; 0.2 ; 0.32 ) |
| CCT | 8100 Kelvin | 11000 Kelvin | 9400 Kelvin |
| distance | 0.06 | 0.052 | |
| 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) 42700 µW/cm² = 427 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) 42700 µW/cm² = 427 W/m² UVB (EU) ( 280 nm - 315 nm) 106 µW/cm² = 1.06 W/m² UVB (US) ( 280 nm - 320 nm) 136 µW/cm² = 1.36 W/m² UVA+B ( 280 nm - 380 nm) 4930 µW/cm² = 49.3 W/m² Solar UVB ( 290 nm - 315 nm) 106 µW/cm² = 1.06 W/m² UVA D3 regulating ( 315 nm - 335 nm) 290 µW/cm² = 2.9 W/m² UVA (EU) ( 315 nm - 380 nm) 4830 µW/cm² = 48.3 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 433 µW/cm² = 4.33 W/m² UVA (US) ( 320 nm - 380 nm) 4800 µW/cm² = 48 W/m² UVA1 (variant) ( 335 nm - 380 nm) 4540 µW/cm² = 45.4 W/m² UVA1 (medical) ( 340 nm - 400 nm) 7250 µW/cm² = 72.5 W/m² vis. UVA ( 350 nm - 380 nm) 3950 µW/cm² = 39.5 W/m² VIS Rep3 ( 350 nm - 600 nm) 34100 µW/cm² = 341 W/m² VIS Rep4 ( 350 nm - 700 nm) 39500 µW/cm² = 395 W/m² purple ( 380 nm - 420 nm) 7220 µW/cm² = 72.2 W/m² VIS ( 380 nm - 780 nm) 37400 µW/cm² = 374 W/m² PAR ( 400 nm - 700 nm) 32700 µW/cm² = 327 W/m² blue ( 420 nm - 490 nm) 10400 µW/cm² = 104 W/m² green ( 490 nm - 575 nm) 9050 µW/cm² = 90.5 W/m² yellow ( 575 nm - 585 nm) 1030 µW/cm² = 10.3 W/m² orange ( 585 nm - 650 nm) 5610 µW/cm² = 56.1 W/m² red ( 650 nm - 780 nm) 4140 µW/cm² = 41.4 W/m² IRA ( 700 nm - 1400 nm) 2190 µW/cm² = 21.9 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 4.9 UV-Index Pyrimidine dimerization of DNA 50.1 µW/cm² Photoceratitis 7 µW/cm² Photoconjunctivitis 0.0673 µW/cm² DNA Damage 0.26 Vitamin D3 17.7 µW/cm² Photosynthesis 23400 µW/cm² Luminosity 83400 lx Human L-Cone 12300 µW/cm² Human M-Cone 10600 µW/cm² Human S-Cone 9100 µW/cm² CIE X 11500 µW/cm² CIE Y 11500 µW/cm² CIE Z 15800 µW/cm² PAR 153000000 mol photons Extinction preD3 143 e-3*m²/mol Extinction Tachysterol 506 e-3*m²/mol Exctincition PreD3 77800 m²/mol Extinction Lumisterol 12.1 m²/mol Exctincition Tachysterol 894000 m²/mol Extinction 7DHC 8.27 m²/mol L-Cone 10200 µW/cm² M-Cone 10600 µW/cm² S-Cone 17000 µW/cm² U-Cone 16000 µW/cm² UVR - ICNIRP 2004 3.32 Rel Biol Eff Melatonin Supression 12500 µW/cm² Blue Light Hazard 11200 µW/cm² (135 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 18.8 µW/cm² Lumen Reptil 114000 "pseudo-lx" Vitamin D3 Degradation 27.1 µW/cm² Actinic UV 3.27 µW/cm² (0.392 mW/klm) Exctincition Lumisterol 21200 m²/mol Exctincition 7DHC 12300 m²/mol Exctincition Toxisterols 18900 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 194 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 5.36 Leybold UVB 125 µW/cm² Leybold UVA 3660 µW/cm² Leybold UVC 0.00185 µW/cm² DeltaOhm UVB 407 µW/cm² DeltaOhm UVC 37.6 µW/cm² Vernier UVB 35.7 µW/cm² Vernier UVA 2000 µW/cm² Gröbel UVA 3920 µW/cm² Gröbel UVB 63 µW/cm² Gröbel UVC -0.043 µW/cm² Solarmeter 6.4 (D3) 16.7 IU/min UVX-31 611 µW/cm² IL UVB 0.0962 µW/cm² IL UVA 4470 µW/cm² Solarmeter 6.5 (UVI, post 2010) 4.57 UV-Index Solarmeter 6.2 (UVB, post 2010) 120 µW/cm² (Solarmeter Ratio = 26.3) Solarmeter AlGaN 6.5 UVI sensor 75.7 UV Index GenUV 7.1 UV-Index 5.3 UV-Index Solarmeter 10.0 (Global Power) 383 W/m² Solarmeter 4.0 (UVA) 78.8 mW/cm² LS122 0 W/m² ISM400 244 W/m²