6000 Kelvin
Spectrum 132: SW-BB6000 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-BB6000 (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 | ( 0.32 ; 0.33 ) | ( 0.35 ; 0.34 ) | ( 0.25 ; 0.26 ; 0.26 ) |
| CCT | 6000 Kelvin | 6000 Kelvin | 6000 Kelvin |
| distance | 0.0002 | 0.00052 | |
| 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) 196000 µW/cm² = 1960 W/m² UVC ( 0 nm - 280 nm) 5180 µW/cm² = 51.8 W/m² non-terrestrial ( 0 nm - 290 nm) 6360 µW/cm² = 63.6 W/m² total2 ( 250 nm - 880 nm) 128000 µW/cm² = 1280 W/m² UVB (EU) ( 280 nm - 315 nm) 4710 µW/cm² = 47.1 W/m² UVB (US) ( 280 nm - 320 nm) 5520 µW/cm² = 55.2 W/m² UVA+B ( 280 nm - 380 nm) 17500 µW/cm² = 175 W/m² Solar UVB ( 290 nm - 315 nm) 3540 µW/cm² = 35.4 W/m² UVA D3 regulating ( 315 nm - 335 nm) 3420 µW/cm² = 34.2 W/m² UVA (EU) ( 315 nm - 380 nm) 12800 µW/cm² = 128 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 3550 µW/cm² = 35.5 W/m² UVA (US) ( 320 nm - 380 nm) 12000 µW/cm² = 120 W/m² UVA1 (variant) ( 335 nm - 380 nm) 9340 µW/cm² = 93.4 W/m² UVA1 (medical) ( 340 nm - 400 nm) 13100 µW/cm² = 131 W/m² vis. UVA ( 350 nm - 380 nm) 6460 µW/cm² = 64.6 W/m² VIS Rep3 ( 350 nm - 600 nm) 62700 µW/cm² = 627 W/m² VIS Rep4 ( 350 nm - 700 nm) 84700 µW/cm² = 847 W/m² purple ( 380 nm - 420 nm) 9680 µW/cm² = 96.8 W/m² VIS ( 380 nm - 780 nm) 92900 µW/cm² = 929 W/m² PAR ( 400 nm - 700 nm) 73500 µW/cm² = 735 W/m² blue ( 420 nm - 490 nm) 18400 µW/cm² = 184 W/m² green ( 490 nm - 575 nm) 22100 µW/cm² = 221 W/m² yellow ( 575 nm - 585 nm) 2470 µW/cm² = 24.7 W/m² orange ( 585 nm - 650 nm) 15200 µW/cm² = 152 W/m² red ( 650 nm - 780 nm) 25100 µW/cm² = 251 W/m² IRA ( 700 nm - 1400 nm) 69600 µW/cm² = 696 W/m² IRB ( 1400 nm - 3000 nm) 21500 µW/cm² = 215 W/m²
Actionspectra
Erythema 2220 UV-Index Pyrimidine dimerization of DNA 2360 µW/cm² Photoceratitis 2790 µW/cm² Photoconjunctivitis 3450 µW/cm² DNA Damage 4640 Vitamin D3 3480 µW/cm² Photosynthesis 52400 µW/cm² Luminosity 194000 lx Human L-Cone 28900 µW/cm² Human M-Cone 24200 µW/cm² Human S-Cone 15200 µW/cm² CIE X 26100 µW/cm² CIE Y 26800 µW/cm² CIE Z 28000 µW/cm² PAR 347000000 mol photons Extinction preD3 46400 e-3*m²/mol Extinction Tachysterol 108000 e-3*m²/mol Exctincition PreD3 39100000 m²/mol Extinction Lumisterol 35500 m²/mol Exctincition Tachysterol 133000000 m²/mol Extinction 7DHC 41300 m²/mol L-Cone 24500 µW/cm² M-Cone 26400 µW/cm² S-Cone 25900 µW/cm² U-Cone 23200 µW/cm² UVR - ICNIRP 2004 4290 Rel Biol Eff Melatonin Supression 23000 µW/cm² Blue Light Hazard 17900 µW/cm² (92.2 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 3550 µW/cm² Lumen Reptil 222000 "pseudo-lx" Vitamin D3 Degradation 2690 µW/cm² Actinic UV 4280 µW/cm² (221 mW/klm) Exctincition Lumisterol 36500000 m²/mol Exctincition 7DHC 43200000 m²/mol Exctincition Toxisterols 19800000 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 10300 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 1310 Leybold UVB 4060 µW/cm² Leybold UVA 8870 µW/cm² Leybold UVC 2600 µW/cm² DeltaOhm UVB 6860 µW/cm² DeltaOhm UVC 4460 µW/cm² Vernier UVB 3340 µW/cm² Vernier UVA 8780 µW/cm² Gröbel UVA 10600 µW/cm² Gröbel UVB 4550 µW/cm² Gröbel UVC 2930 µW/cm² Solarmeter 6.4 (D3) 4090 IU/min UVX-31 7600 µW/cm² IL UVB 4.22 µW/cm² IL UVA 10400 µW/cm² Solarmeter 6.5 (UVI, post 2010) 869 UV-Index Solarmeter 6.2 (UVB, post 2010) 4240 µW/cm² (Solarmeter Ratio = 4.88) Solarmeter AlGaN 6.5 UVI sensor 4760 UV Index GenUV 7.1 UV-Index 343 UV-Index Solarmeter 10.0 (Global Power) 1720 W/m² Solarmeter 4.0 (UVA) 166 mW/cm² LS122 440 W/m² ISM400 1640 W/m²