Spectrum 254: BRR1 Edit
DeleteMeasurement
| Brand |
other other |
|---|---|
| Lamp Product |
Chinese Tropic Sun 5.0 T8 18W |
| Lamp ID |
BRR1 (03/2007) Lamp type associated with PKC |
| Spectrometer | USB 2000 |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 10 cm |
| Age | 1 hours |
| Originator (measurement) | Frances Baines |
Database entry created:
Maren
11/Jun/2010 ; 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 | ( 0.28 ; 0.3 ) | ( 0.37 ; 0.46 ) | ( 0.23 ; 0.29 ; 0.35 ) |
| CCT | 9500 Kelvin | 5500 Kelvin | 6200 Kelvin |
| distance | 0.11 | 0.097 | |
| 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) 892 µW/cm² = 8.92 W/m² UVC ( 0 nm - 280 nm) 3.32 µW/cm² = 0.0332 W/m² non-terrestrial ( 0 nm - 290 nm) 8.67 µW/cm² = 0.0867 W/m² total2 ( 250 nm - 880 nm) 892 µW/cm² = 8.92 W/m² UVB (EU) ( 280 nm - 315 nm) 78.4 µW/cm² = 0.784 W/m² UVB (US) ( 280 nm - 320 nm) 90 µW/cm² = 0.9 W/m² UVA+B ( 280 nm - 380 nm) 138 µW/cm² = 1.38 W/m² Solar UVB ( 290 nm - 315 nm) 73.1 µW/cm² = 0.731 W/m² UVA D3 regulating ( 315 nm - 335 nm) 30.9 µW/cm² = 0.309 W/m² UVA (EU) ( 315 nm - 380 nm) 59.7 µW/cm² = 0.597 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 22.4 µW/cm² = 0.224 W/m² UVA (US) ( 320 nm - 380 nm) 48.1 µW/cm² = 0.481 W/m² UVA1 (variant) ( 335 nm - 380 nm) 28.9 µW/cm² = 0.289 W/m² UVA1 (medical) ( 340 nm - 400 nm) 40.9 µW/cm² = 0.409 W/m² vis. UVA ( 350 nm - 380 nm) 21.9 µW/cm² = 0.219 W/m² VIS Rep3 ( 350 nm - 600 nm) 594 µW/cm² = 5.94 W/m² VIS Rep4 ( 350 nm - 700 nm) 728 µW/cm² = 7.28 W/m² purple ( 380 nm - 420 nm) 64.9 µW/cm² = 0.649 W/m² VIS ( 380 nm - 780 nm) 742 µW/cm² = 7.42 W/m² VIS2 ( 400 nm - 680 nm) 673 µW/cm² = 6.73 W/m² PAR ( 400 nm - 700 nm) 691 µW/cm² = 6.91 W/m² tmp ( 400 nm - 1100 nm) 736 µW/cm² = 7.36 W/m² blue ( 420 nm - 490 nm) 231 µW/cm² = 2.31 W/m² green ( 490 nm - 575 nm) 222 µW/cm² = 2.22 W/m² yellow ( 575 nm - 585 nm) 28.3 µW/cm² = 0.283 W/m² orange ( 585 nm - 650 nm) 106 µW/cm² = 1.06 W/m² red ( 650 nm - 780 nm) 90.6 µW/cm² = 0.906 W/m² IRA ( 700 nm - 1400 nm) 44.6 µW/cm² = 0.446 W/m² IR2 ( 720 nm - 1100 nm) 31.4 µW/cm² = 0.314 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 14.6 UV-Index Pyrimidine dimerization of DNA 44.6 µW/cm² Photoceratitis 21.8 µW/cm² Photoconjunctivitis 4.35 µW/cm² DNA Damage 7.49 Vitamin D3 42.3 µW/cm² Photosynthesis 492 µW/cm² Luminosity 1830 lx Human L-Cone 267 µW/cm² Human M-Cone 243 µW/cm² Human S-Cone 192 µW/cm² CIE X 236 µW/cm² CIE Y 254 µW/cm² CIE Z 355 µW/cm² PAR 3240000 mol photons Extinction preD3 205 e-3*m²/mol Extinction Tachysterol 705 e-3*m²/mol Exctincition PreD3 126000 m²/mol Extinction Lumisterol 124 m²/mol Exctincition Tachysterol 900000 m²/mol Extinction 7DHC 157 m²/mol L-Cone 216 µW/cm² M-Cone 273 µW/cm² S-Cone 333 µW/cm² U-Cone 123 µW/cm² UVR - ICNIRP 2004 18.8 Rel Biol Eff Melatonin Supression 267 µW/cm² Blue Light Hazard 217 µW/cm² (118 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 44.8 µW/cm² Lumen Reptil 2130 "pseudo-lx" Vitamin D3 Degradation 24.9 µW/cm² Actinic UV 18.6 µW/cm² (102 mW/klm) Exctincition Lumisterol 145000 m²/mol Exctincition 7DHC 181000 m²/mol Exctincition Toxisterols 22300 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 109 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 12.8 Leybold UVB 74.9 µW/cm² Leybold UVA 30.5 µW/cm² Leybold UVC 2.57 µW/cm² DeltaOhm UVB 90.9 µW/cm² DeltaOhm UVC 20.4 µW/cm² Vernier UVB 46.3 µW/cm² Vernier UVA 48.8 µW/cm² Gröbel UVA 52.1 µW/cm² Gröbel UVB 59.9 µW/cm² Gröbel UVC 2.83 µW/cm² Luxmeter 1910 lx Solarmeter 6.4 (D3) 40 IU/min UVX-31 97.7 µW/cm² IL UVB 0.0479 µW/cm² IL UVA 41.3 µW/cm² Solarmeter 6.5 (UVI, post 2010) 8.6 UV-Index Solarmeter 6.2 (UVB, post 2010) 53.3 µW/cm² (Solarmeter Ratio = 6.19) Solarmeter AlGaN 6.5 UVI sensor 68.2 UV Index GenUV 7.1 UV-Index 3.5 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 8.04 W/m² Solarmeter 4.0 (UVA) 0.714 mW/cm² LS122 (manuf.) 0.00477 W/m² ISM400 (first guess) 5.23 W/m² LS122 (assumption) 0.236 W/m² ISM400_new 4.28 W/m² Solarmeter 10.0 (Global Power) (assumption) 7.34 W/m²