Prototype
Spectrum 532: BLIH3 Edit
DeleteMeasurement
| Brand |
Light Impex Henze GmbH |
|---|---|
| Lamp Product |
UV-Junior 150W SYM Metal Halide Floodlamp |
| Lamp ID |
BLIH3 (12/2016) Second prototype of metal halide lamp |
| Spectrometer | USB2000+ (2) |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 100 cm |
| Age | 20 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 | ( 0.31 ; 0.3 ) | ( 0.29 ; 0.43 ) | ( 0.23 ; 0.22 ; 0.33 ) |
| CCT | 7100 Kelvin | 7700 Kelvin | 6800 Kelvin |
| distance | 0.092 | 0.071 | |
| 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) 7430 µW/cm² = 74.3 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) 7430 µW/cm² = 74.3 W/m² UVB (EU) ( 280 nm - 315 nm) 22.4 µW/cm² = 0.224 W/m² UVB (US) ( 280 nm - 320 nm) 25.2 µW/cm² = 0.252 W/m² UVA+B ( 280 nm - 380 nm) 561 µW/cm² = 5.61 W/m² Solar UVB ( 290 nm - 315 nm) 22.4 µW/cm² = 0.224 W/m² UVA D3 regulating ( 315 nm - 335 nm) 60.2 µW/cm² = 0.602 W/m² UVA (EU) ( 315 nm - 380 nm) 538 µW/cm² = 5.38 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 80.4 µW/cm² = 0.804 W/m² UVA (US) ( 320 nm - 380 nm) 536 µW/cm² = 5.36 W/m² UVA1 (variant) ( 335 nm - 380 nm) 478 µW/cm² = 4.78 W/m² UVA1 (medical) ( 340 nm - 400 nm) 763 µW/cm² = 7.63 W/m² vis. UVA ( 350 nm - 380 nm) 409 µW/cm² = 4.09 W/m² VIS Rep3 ( 350 nm - 600 nm) 5810 µW/cm² = 58.1 W/m² VIS Rep4 ( 350 nm - 700 nm) 6620 µW/cm² = 66.2 W/m² purple ( 380 nm - 420 nm) 1060 µW/cm² = 10.6 W/m² VIS ( 380 nm - 780 nm) 6380 µW/cm² = 63.8 W/m² VIS2 ( 400 nm - 680 nm) 5820 µW/cm² = 58.2 W/m² PAR ( 400 nm - 700 nm) 5900 µW/cm² = 59 W/m² tmp ( 400 nm - 1100 nm) 6560 µW/cm² = 65.6 W/m² blue ( 420 nm - 490 nm) 1810 µW/cm² = 18.1 W/m² green ( 490 nm - 575 nm) 1700 µW/cm² = 17 W/m² yellow ( 575 nm - 585 nm) 80 µW/cm² = 0.8 W/m² orange ( 585 nm - 650 nm) 1320 µW/cm² = 13.2 W/m² red ( 650 nm - 780 nm) 415 µW/cm² = 4.15 W/m² IRA ( 700 nm - 1400 nm) 660 µW/cm² = 6.6 W/m² IR2 ( 720 nm - 1100 nm) 613 µW/cm² = 6.13 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 1.53 UV-Index Pyrimidine dimerization of DNA 15 µW/cm² Photoceratitis 2.24 µW/cm² Photoconjunctivitis 0.0396 µW/cm² DNA Damage 0.125 Vitamin D3 7.03 µW/cm² Photosynthesis 4120 µW/cm² Luminosity 16500 lx Human L-Cone 2470 µW/cm² Human M-Cone 2060 µW/cm² Human S-Cone 1650 µW/cm² CIE X 2360 µW/cm² CIE Y 2280 µW/cm² CIE Z 3010 µW/cm² PAR 27300000 mol photons Extinction preD3 36.3 e-3*m²/mol Extinction Tachysterol 122 e-3*m²/mol Exctincition PreD3 18500 m²/mol Extinction Lumisterol 5.99 m²/mol Exctincition Tachysterol 197000 m²/mol Extinction 7DHC 4.21 m²/mol L-Cone 2070 µW/cm² M-Cone 2000 µW/cm² S-Cone 2940 µW/cm² U-Cone 1900 µW/cm² UVR - ICNIRP 2004 1.15 Rel Biol Eff Melatonin Supression 2300 µW/cm² Blue Light Hazard 1910 µW/cm² (116 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 8.21 µW/cm² Lumen Reptil 19700 "pseudo-lx" Vitamin D3 Degradation 6.3 µW/cm² Actinic UV 1.15 µW/cm² (0.695 mW/klm) Exctincition Lumisterol 8610 m²/mol Exctincition 7DHC 5370 m²/mol Exctincition Toxisterols 3590 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 36.5 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 2.05 Leybold UVB 26.5 µW/cm² Leybold UVA 406 µW/cm² Leybold UVC 0.00124 µW/cm² DeltaOhm UVB 75.1 µW/cm² DeltaOhm UVC 8.2 µW/cm² Vernier UVB 12.5 µW/cm² Vernier UVA 245 µW/cm² Gröbel UVA 434 µW/cm² Gröbel UVB 15.2 µW/cm² Gröbel UVC 0.000144 µW/cm² Luxmeter 17100 lx Solarmeter 6.4 (D3) 6.4 IU/min UVX-31 99.9 µW/cm² IL UVB 0.0188 µW/cm² IL UVA 480 µW/cm² Solarmeter 6.5 (UVI, post 2010) 1.7 UV-Index Solarmeter 6.2 (UVB, post 2010) 24.1 µW/cm² (Solarmeter Ratio = 14.2) Solarmeter AlGaN 6.5 UVI sensor 18.8 UV Index GenUV 7.1 UV-Index 1.04 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 71.9 W/m² Solarmeter 4.0 (UVA) 8.72 mW/cm² LS122 (manuf.) 0.743 W/m² ISM400 (first guess) 50.6 W/m² LS122 (assumption) 2.65 W/m² ISM400_new 43.6 W/m² Solarmeter 10.0 (Global Power) (assumption) 66.8 W/m²