7000 Kelvin
Spectrum 134: SW-BB7000 Edit
DeleteMeasurement
| Brand |
other other |
|---|---|
| Lamp Product |
Black Body Radiation Black Body Radiation I(lambda in meters) prop.to 1/lambda^5/(exp(0.014388/lambda/KELVIN)-1) |
| Lamp ID |
SW-BB7000 (03/2010) |
| Spectrometer | - |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 0 cm |
| Age | 0 hours |
| Originator (measurement) | Sarina Wunderlich |
Database entry created:
Sarina Wunderlich
12/Mar/2010 ; updated:
Sarina Wunderlich
5/May/2021
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 ; 0.32 ) | ( 0.32 ; 0.34 ) | ( 0.21 ; 0.25 ; 0.27 ) |
| CCT | 7000 Kelvin | 7000 Kelvin | 7000 Kelvin |
| distance | 0.00017 | 0.00044 | |
| 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) 181000 µW/cm² = 1810 W/m² UVC ( 0 nm - 280 nm) 11000 µW/cm² = 110 W/m² non-terrestrial ( 0 nm - 290 nm) 12900 µW/cm² = 129 W/m² total2 ( 250 nm - 880 nm) 130000 µW/cm² = 1300 W/m² UVB (EU) ( 280 nm - 315 nm) 7440 µW/cm² = 74.4 W/m² UVB (US) ( 280 nm - 320 nm) 8630 µW/cm² = 86.3 W/m² UVA+B ( 280 nm - 380 nm) 24600 µW/cm² = 246 W/m² Solar UVB ( 290 nm - 315 nm) 5490 µW/cm² = 54.9 W/m² UVA D3 regulating ( 315 nm - 335 nm) 4920 µW/cm² = 49.2 W/m² UVA (EU) ( 315 nm - 380 nm) 17100 µW/cm² = 171 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 5020 µW/cm² = 50.2 W/m² UVA (US) ( 320 nm - 380 nm) 15900 µW/cm² = 159 W/m² UVA1 (variant) ( 335 nm - 380 nm) 12200 µW/cm² = 122 W/m² UVA1 (medical) ( 340 nm - 400 nm) 16600 µW/cm² = 166 W/m² vis. UVA ( 350 nm - 380 nm) 8280 µW/cm² = 82.8 W/m² VIS Rep3 ( 350 nm - 600 nm) 66200 µW/cm² = 662 W/m² VIS Rep4 ( 350 nm - 700 nm) 85200 µW/cm² = 852 W/m² purple ( 380 nm - 420 nm) 11500 µW/cm² = 115 W/m² VIS ( 380 nm - 780 nm) 88900 µW/cm² = 889 W/m² PAR ( 400 nm - 700 nm) 71300 µW/cm² = 713 W/m² blue ( 420 nm - 490 nm) 19700 µW/cm² = 197 W/m² green ( 490 nm - 575 nm) 21300 µW/cm² = 213 W/m² yellow ( 575 nm - 585 nm) 2260 µW/cm² = 22.6 W/m² orange ( 585 nm - 650 nm) 13400 µW/cm² = 134 W/m² red ( 650 nm - 780 nm) 20800 µW/cm² = 208 W/m² IRA ( 700 nm - 1400 nm) 52500 µW/cm² = 525 W/m² IRB ( 1400 nm - 3000 nm) 14100 µW/cm² = 141 W/m²
Actionspectra
Erythema 3810 UV-Index Pyrimidine dimerization of DNA 3670 µW/cm² Photoceratitis 4710 µW/cm² Photoconjunctivitis 6560 µW/cm² DNA Damage 8830 Vitamin D3 5660 µW/cm² Photosynthesis 51200 µW/cm² Luminosity 182000 lx Human L-Cone 27000 µW/cm² Human M-Cone 23200 µW/cm² Human S-Cone 16500 µW/cm² CIE X 24400 µW/cm² CIE Y 25200 µW/cm² CIE Z 30000 µW/cm² PAR 334000000 mol photons Extinction preD3 84000 e-3*m²/mol Extinction Tachysterol 185000 e-3*m²/mol Exctincition PreD3 71200000 m²/mol Extinction Lumisterol 63500 m²/mol Exctincition Tachysterol 226000000 m²/mol Extinction 7DHC 72700 m²/mol L-Cone 22600 µW/cm² M-Cone 26500 µW/cm² S-Cone 28400 µW/cm² U-Cone 28300 µW/cm² UVR - ICNIRP 2004 7580 Rel Biol Eff Melatonin Supression 24400 µW/cm² Blue Light Hazard 19400 µW/cm² (107 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 5740 µW/cm² Lumen Reptil 228000 "pseudo-lx" Vitamin D3 Degradation 4400 µW/cm² Actinic UV 7580 µW/cm² (416 mW/klm) Exctincition Lumisterol 64000000 m²/mol Exctincition 7DHC 75300000 m²/mol Exctincition Toxisterols 38900000 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 16800 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 2150 Leybold UVB 6260 µW/cm² Leybold UVA 11700 µW/cm² Leybold UVC 4980 µW/cm² DeltaOhm UVB 10300 µW/cm² DeltaOhm UVC 8170 µW/cm² Vernier UVB 5290 µW/cm² Vernier UVA 12100 µW/cm² Gröbel UVA 14200 µW/cm² Gröbel UVB 7310 µW/cm² Gröbel UVC 5610 µW/cm² Solarmeter 6.4 (D3) 6700 IU/min UVX-31 11400 µW/cm² IL UVB 6.77 µW/cm² IL UVA 13800 µW/cm² Solarmeter 6.5 (UVI, post 2010) 1450 UV-Index Solarmeter 6.2 (UVB, post 2010) 6740 µW/cm² (Solarmeter Ratio = 4.67) Solarmeter AlGaN 6.5 UVI sensor 7610 UV Index GenUV 7.1 UV-Index 576 UV-Index Solarmeter 10.0 (Global Power) 1520 W/m² Solarmeter 4.0 (UVA) 215 mW/cm² LS122 310 W/m² ISM400 1350 W/m²