Experimental Lamp- 342h use
Spectrum 504: PH-U1 Edit
DeleteMeasurement
| Brand |
Philips Koninklijke Philips Electronics N.V. http://www.philips.com/ |
|---|---|
| Lamp Product |
Softone Warm White T65 WW827 Research project c/o Oonincx et al 2012 |
| Lamp ID |
PH-U1 (04/2014) Experimental Lamp |
| Spectrometer | USB2000+ (2) |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 10 cm |
| Age | 342 hours |
| Originator (measurement) | Frances Baines |
Database entry created:
Frances Baines
29/Apr/2014 ; updated:
Frances Baines
29/Apr/2014
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 | ( 0.45 ; 0.39 ) | ( 0.41 ; 0.46 ) | ( 0.53 ; 0.2 ; 0.22 ) |
| CCT | 2700 Kelvin | 4900 Kelvin | 2800 Kelvin |
| distance | 0.12 | 0.12 | |
| 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) 1540 µW/cm² = 15.4 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) 1540 µW/cm² = 15.4 W/m² UVB (EU) ( 280 nm - 315 nm) 0.0559 µW/cm² = 0.000559 W/m² UVB (US) ( 280 nm - 320 nm) 0.273 µW/cm² = 0.00273 W/m² UVA+B ( 280 nm - 380 nm) 12 µW/cm² = 0.12 W/m² Solar UVB ( 290 nm - 315 nm) 0.0559 µW/cm² = 0.000559 W/m² UVA D3 regulating ( 315 nm - 335 nm) 0.278 µW/cm² = 0.00278 W/m² UVA (EU) ( 315 nm - 380 nm) 12 µW/cm² = 0.12 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 0.0725 µW/cm² = 0.000725 W/m² UVA (US) ( 320 nm - 380 nm) 11.8 µW/cm² = 0.118 W/m² UVA1 (variant) ( 335 nm - 380 nm) 11.7 µW/cm² = 0.117 W/m² UVA1 (medical) ( 340 nm - 400 nm) 13.3 µW/cm² = 0.133 W/m² vis. UVA ( 350 nm - 380 nm) 11.6 µW/cm² = 0.116 W/m² VIS Rep3 ( 350 nm - 600 nm) 856 µW/cm² = 8.56 W/m² VIS Rep4 ( 350 nm - 700 nm) 1480 µW/cm² = 14.8 W/m² purple ( 380 nm - 420 nm) 52.1 µW/cm² = 0.521 W/m² VIS ( 380 nm - 780 nm) 1520 µW/cm² = 15.2 W/m² PAR ( 400 nm - 700 nm) 1470 µW/cm² = 14.7 W/m² blue ( 420 nm - 490 nm) 202 µW/cm² = 2.02 W/m² green ( 490 nm - 575 nm) 428 µW/cm² = 4.28 W/m² yellow ( 575 nm - 585 nm) 61.8 µW/cm² = 0.618 W/m² orange ( 585 nm - 650 nm) 670 µW/cm² = 6.7 W/m² red ( 650 nm - 780 nm) 109 µW/cm² = 1.09 W/m² IRA ( 700 nm - 1400 nm) 54.1 µW/cm² = 0.541 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 0.00447 UV-Index Pyrimidine dimerization of DNA 0.0479 µW/cm² Photoceratitis 0.00367 µW/cm² Photoconjunctivitis 2.76E-5 µW/cm² DNA Damage 7.56E-5 Vitamin D3 0.0115 µW/cm² Photosynthesis 934 µW/cm² Luminosity 5540 lx Human L-Cone 877 µW/cm² Human M-Cone 591 µW/cm² Human S-Cone 172 µW/cm² CIE X 875 µW/cm² CIE Y 769 µW/cm² CIE Z 314 µW/cm² PAR 7240000 mol photons Extinction preD3 0.148 e-3*m²/mol Extinction Tachysterol 0.568 e-3*m²/mol Exctincition PreD3 61.8 m²/mol Extinction Lumisterol 0.00488 m²/mol Exctincition Tachysterol 744 m²/mol Extinction 7DHC 0.00115 m²/mol L-Cone 792 µW/cm² M-Cone 293 µW/cm² S-Cone 326 µW/cm² U-Cone 89 µW/cm² UVR - ICNIRP 2004 0.00236 Rel Biol Eff Melatonin Supression 231 µW/cm² Blue Light Hazard 197 µW/cm² (35.5 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 0.0113 µW/cm² Lumen Reptil 3990 "pseudo-lx" Vitamin D3 Degradation 0.0291 µW/cm² Actinic UV 0.00237 µW/cm² (0.00427 mW/klm) Exctincition Lumisterol 11.8 m²/mol Exctincition 7DHC 3.04 m²/mol Exctincition Toxisterols 12.6 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 0.27 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 0.00463 Leybold UVB 0.137 µW/cm² Leybold UVA 8.17 µW/cm² Leybold UVC 0 µW/cm² DeltaOhm UVB 0.309 µW/cm² DeltaOhm UVC 0.0411 µW/cm² Vernier UVB 0.0329 µW/cm² Vernier UVA 3.85 µW/cm² Gröbel UVA 9.88 µW/cm² Gröbel UVB 0.0524 µW/cm² Gröbel UVC -6.33E-5 µW/cm² Solarmeter 6.4 (D3) 0.0145 IU/min UVX-31 0.646 µW/cm² IL UVB 0.000104 µW/cm² IL UVA 11.1 µW/cm² Solarmeter 6.5 (UVI, post 2010) 0.0036 UV-Index Solarmeter 6.2 (UVB, post 2010) 0.148 µW/cm² (Solarmeter Ratio = 41) Solarmeter AlGaN 6.5 UVI sensor 0.0613 UV Index GenUV 7.1 UV-Index 0.00675 UV-Index Solarmeter 10.0 (Global Power) 17.3 W/m² Solarmeter 4.0 (UVA) 0.222 mW/cm² LS122 0 W/m² ISM400 12.9 W/m²