Philips
Spectrum 356: BEX1 Edit
DeleteMeasurement
| Brand |
Philips Koninklijke Philips Electronics N.V. http://www.philips.com/ |
|---|---|
| Lamp Product |
Master Colour CDMTD UV |
| Lamp ID |
BEX1 (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:
Thomas Griffiths (Tomaskas Ltd.)
21/Nov/2023
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 | ( 0.36 ; 0.35 ) | ( 0.4 ; 0.41 ) | ( 0.33 ; 0.27 ; 0.27 ) |
| CCT | 4600 Kelvin | 5100 Kelvin | 4600 Kelvin |
| distance | 0.065 | 0.049 | |
| 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) 3780 µW/cm² = 37.8 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) 3780 µW/cm² = 37.8 W/m² UVB (EU) ( 280 nm - 315 nm) 0 µW/cm² = 0 W/m² UVB (US) ( 280 nm - 320 nm) 0 µW/cm² = 0 W/m² UVA+B ( 280 nm - 380 nm) 105 µW/cm² = 1.05 W/m² Solar UVB ( 290 nm - 315 nm) 0 µW/cm² = 0 W/m² UVA D3 regulating ( 315 nm - 335 nm) 0 µW/cm² = 0 W/m² UVA (EU) ( 315 nm - 380 nm) 105 µW/cm² = 1.05 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 0.219 µW/cm² = 0.00219 W/m² UVA (US) ( 320 nm - 380 nm) 105 µW/cm² = 1.05 W/m² UVA1 (variant) ( 335 nm - 380 nm) 105 µW/cm² = 1.05 W/m² UVA1 (medical) ( 340 nm - 400 nm) 182 µW/cm² = 1.82 W/m² vis. UVA ( 350 nm - 380 nm) 101 µW/cm² = 1.01 W/m² VIS Rep3 ( 350 nm - 600 nm) 2330 µW/cm² = 23.3 W/m² VIS Rep4 ( 350 nm - 700 nm) 3310 µW/cm² = 33.1 W/m² purple ( 380 nm - 420 nm) 254 µW/cm² = 2.54 W/m² VIS ( 380 nm - 780 nm) 3490 µW/cm² = 34.9 W/m² VIS2 ( 400 nm - 680 nm) 3000 µW/cm² = 30 W/m² PAR ( 400 nm - 700 nm) 3130 µW/cm² = 31.3 W/m² tmp ( 400 nm - 1100 nm) 3600 µW/cm² = 36 W/m² blue ( 420 nm - 490 nm) 704 µW/cm² = 7.04 W/m² green ( 490 nm - 575 nm) 906 µW/cm² = 9.06 W/m² yellow ( 575 nm - 585 nm) 103 µW/cm² = 1.03 W/m² orange ( 585 nm - 650 nm) 863 µW/cm² = 8.63 W/m² red ( 650 nm - 780 nm) 658 µW/cm² = 6.58 W/m² IRA ( 700 nm - 1400 nm) 467 µW/cm² = 4.67 W/m² IR2 ( 720 nm - 1100 nm) 386 µW/cm² = 3.86 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 0.0217 UV-Index Pyrimidine dimerization of DNA 0.0126 µW/cm² Photoceratitis 0 µW/cm² Photoconjunctivitis 0 µW/cm² DNA Damage 7.27E-5 Vitamin D3 0 µW/cm² Photosynthesis 2170 µW/cm² Luminosity 9080 lx Human L-Cone 1380 µW/cm² Human M-Cone 1090 µW/cm² Human S-Cone 587 µW/cm² CIE X 1290 µW/cm² CIE Y 1260 µW/cm² CIE Z 1070 µW/cm² PAR 14700000 mol photons Extinction preD3 0 e-3*m²/mol Extinction Tachysterol 0 e-3*m²/mol Exctincition PreD3 63.7 m²/mol Extinction Lumisterol 0 m²/mol Exctincition Tachysterol 1140 m²/mol Extinction 7DHC 0 m²/mol L-Cone 1200 µW/cm² M-Cone 974 µW/cm² S-Cone 1000 µW/cm² U-Cone 489 µW/cm² UVR - ICNIRP 2004 0.0146 Rel Biol Eff Melatonin Supression 854 µW/cm² Blue Light Hazard 690 µW/cm² (76 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 0 µW/cm² Lumen Reptil 8760 "pseudo-lx" Vitamin D3 Degradation 0 µW/cm² Actinic UV 0.0146 µW/cm² (0.0161 mW/klm) Exctincition Lumisterol 0 m²/mol Exctincition 7DHC 0 m²/mol Exctincition Toxisterols 57.7 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 0.672 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 0.00904 Leybold UVB 2.02E-5 µW/cm² Leybold UVA 76.1 µW/cm² Leybold UVC 0 µW/cm² DeltaOhm UVB 0.329 µW/cm² DeltaOhm UVC 0 µW/cm² Vernier UVB 0 µW/cm² Vernier UVA 35.2 µW/cm² Gröbel UVA 80.9 µW/cm² Gröbel UVB 0.0186 µW/cm² Gröbel UVC 0 µW/cm² Luxmeter 9110 lx Solarmeter 6.4 (D3) 0.0283 IU/min UVX-31 3.6 µW/cm² IL UVB 0.000386 µW/cm² IL UVA 97.9 µW/cm² Solarmeter 6.5 (UVI, post 2010) 0.00322 UV-Index Solarmeter 6.2 (UVB, post 2010) 0.0269 µW/cm² (Solarmeter Ratio = 8.36) Solarmeter AlGaN 6.5 UVI sensor 0.028 UV Index GenUV 7.1 UV-Index 0.0303 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 41.9 W/m² Solarmeter 4.0 (UVA) 1.86 mW/cm² LS122 (manuf.) 0.166 W/m² ISM400 (first guess) 33.3 W/m² LS122 (assumption) 1.71 W/m² ISM400_new 29.3 W/m² Solarmeter 10.0 (Global Power) (assumption) 40.9 W/m²