Spectrum 363: BEX5 Edit
DeleteMeasurement
| Brand |
BLV http://www.blv-licht.de |
|---|---|
| Lamp Product |
HITlite HIT-DE 70W 10'000K |
| Lamp ID |
BEX5 (02/2009) |
| Spectrometer | USB2000+ |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 10 cm |
| Age | 0 hours |
| Originator (measurement) | Frances Baines |
Database entry created:
Sarina Wunderlich
31/Jan/2011 ; updated:
Sarina Wunderlich
27/Feb/2011
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 ; 0.23 ) | ( 0.18 ; 0.4 ) | ( 0.12 ; 0.16 ; 0.35 ) |
| CCT | 75000 Kelvin | 24000 Kelvin | 54000 Kelvin |
| distance | 0.084 | 0.074 | |
| 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) 6220 µW/cm² = 62.2 W/m² UVC ( 0 nm - 280 nm) 70.9 µW/cm² = 0.709 W/m² non-terrestrial ( 0 nm - 290 nm) 98.3 µW/cm² = 0.983 W/m² total2 ( 250 nm - 880 nm) 6220 µW/cm² = 62.2 W/m² UVB (EU) ( 280 nm - 315 nm) 194 µW/cm² = 1.94 W/m² UVB (US) ( 280 nm - 320 nm) 217 µW/cm² = 2.17 W/m² UVA+B ( 280 nm - 380 nm) 1160 µW/cm² = 11.6 W/m² Solar UVB ( 290 nm - 315 nm) 166 µW/cm² = 1.66 W/m² UVA D3 regulating ( 315 nm - 335 nm) 97.3 µW/cm² = 0.973 W/m² UVA (EU) ( 315 nm - 380 nm) 966 µW/cm² = 9.66 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 111 µW/cm² = 1.11 W/m² UVA (US) ( 320 nm - 380 nm) 942 µW/cm² = 9.42 W/m² UVA1 (variant) ( 335 nm - 380 nm) 869 µW/cm² = 8.69 W/m² UVA1 (medical) ( 340 nm - 400 nm) 1360 µW/cm² = 13.6 W/m² vis. UVA ( 350 nm - 380 nm) 738 µW/cm² = 7.38 W/m² VIS Rep3 ( 350 nm - 600 nm) 4650 µW/cm² = 46.5 W/m² VIS Rep4 ( 350 nm - 700 nm) 5260 µW/cm² = 52.6 W/m² purple ( 380 nm - 420 nm) 1220 µW/cm² = 12.2 W/m² VIS ( 380 nm - 780 nm) 4810 µW/cm² = 48.1 W/m² VIS2 ( 400 nm - 680 nm) 3850 µW/cm² = 38.5 W/m² PAR ( 400 nm - 700 nm) 3990 µW/cm² = 39.9 W/m² tmp ( 400 nm - 1100 nm) 4460 µW/cm² = 44.6 W/m² blue ( 420 nm - 490 nm) 1570 µW/cm² = 15.7 W/m² green ( 490 nm - 575 nm) 875 µW/cm² = 8.75 W/m² yellow ( 575 nm - 585 nm) 145 µW/cm² = 1.45 W/m² orange ( 585 nm - 650 nm) 419 µW/cm² = 4.19 W/m² red ( 650 nm - 780 nm) 582 µW/cm² = 5.82 W/m² IRA ( 700 nm - 1400 nm) 472 µW/cm² = 4.72 W/m² IR2 ( 720 nm - 1100 nm) 408 µW/cm² = 4.08 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 62.7 UV-Index Pyrimidine dimerization of DNA 93.6 µW/cm² Photoceratitis 73.5 µW/cm² Photoconjunctivitis 67.2 µW/cm² DNA Damage 81.3 Vitamin D3 108 µW/cm² Photosynthesis 3040 µW/cm² Luminosity 7810 lx Human L-Cone 1130 µW/cm² Human M-Cone 1040 µW/cm² Human S-Cone 1390 µW/cm² CIE X 1170 µW/cm² CIE Y 1060 µW/cm² CIE Z 2360 µW/cm² PAR 18200000 mol photons Extinction preD3 1050 e-3*m²/mol Extinction Tachysterol 2870 e-3*m²/mol Exctincition PreD3 866000 m²/mol Extinction Lumisterol 820 m²/mol Exctincition Tachysterol 3630000 m²/mol Extinction 7DHC 1000 m²/mol L-Cone 907 µW/cm² M-Cone 1220 µW/cm² S-Cone 2680 µW/cm² U-Cone 2890 µW/cm² UVR - ICNIRP 2004 103 Rel Biol Eff Melatonin Supression 1810 µW/cm² Blue Light Hazard 1760 µW/cm² (225 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 111 µW/cm² Lumen Reptil 15300 "pseudo-lx" Vitamin D3 Degradation 78.1 µW/cm² Actinic UV 103 µW/cm² (132 mW/klm) Exctincition Lumisterol 906000 m²/mol Exctincition 7DHC 1070000 m²/mol Exctincition Toxisterols 268000 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 342 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 37 Leybold UVB 168 µW/cm² Leybold UVA 712 µW/cm² Leybold UVC 52.2 µW/cm² DeltaOhm UVB 252 µW/cm² DeltaOhm UVC 98.3 µW/cm² Vernier UVB 102 µW/cm² Vernier UVA 467 µW/cm² Gröbel UVA 798 µW/cm² Gröbel UVB 153 µW/cm² Gröbel UVC 57.9 µW/cm² Luxmeter 8160 lx Solarmeter 6.4 (D3) 116 IU/min UVX-31 304 µW/cm² IL UVB 0.139 µW/cm² IL UVA 886 µW/cm² Solarmeter 6.5 (UVI, post 2010) 26.5 UV-Index Solarmeter 6.2 (UVB, post 2010) 149 µW/cm² (Solarmeter Ratio = 5.62) Solarmeter AlGaN 6.5 UVI sensor 166 UV Index GenUV 7.1 UV-Index 10.8 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 51.2 W/m² Solarmeter 4.0 (UVA) 15.2 mW/cm² LS122 (manuf.) 0.0944 W/m² ISM400 (first guess) 31.9 W/m² LS122 (assumption) 1.28 W/m² ISM400_new 26.8 W/m² Solarmeter 10.0 (Global Power) (assumption) 43.9 W/m²