8000 Kelvin
Spectrum 136: SW-BB8000 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-BB8000 (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 | ( 0.3 ; 0.3 ) | ( 0.3 ; 0.34 ) | ( 0.19 ; 0.24 ; 0.27 ) |
| CCT | 8000 Kelvin | 8000 Kelvin | 8000 Kelvin |
| distance | 6.5E-5 | 7.6E-5 | |
| 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) 186000 µW/cm² = 1860 W/m² UVC ( 0 nm - 280 nm) 20100 µW/cm² = 201 W/m² non-terrestrial ( 0 nm - 290 nm) 22900 µW/cm² = 229 W/m² total2 ( 250 nm - 880 nm) 138000 µW/cm² = 1380 W/m² UVB (EU) ( 280 nm - 315 nm) 10600 µW/cm² = 106 W/m² UVB (US) ( 280 nm - 320 nm) 12200 µW/cm² = 122 W/m² UVA+B ( 280 nm - 380 nm) 32200 µW/cm² = 322 W/m² Solar UVB ( 290 nm - 315 nm) 7720 µW/cm² = 77.2 W/m² UVA D3 regulating ( 315 nm - 335 nm) 6530 µW/cm² = 65.3 W/m² UVA (EU) ( 315 nm - 380 nm) 21600 µW/cm² = 216 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 6580 µW/cm² = 65.8 W/m² UVA (US) ( 320 nm - 380 nm) 20000 µW/cm² = 200 W/m² UVA1 (variant) ( 335 nm - 380 nm) 15100 µW/cm² = 151 W/m² UVA1 (medical) ( 340 nm - 400 nm) 20100 µW/cm² = 201 W/m² vis. UVA ( 350 nm - 380 nm) 10100 µW/cm² = 101 W/m² VIS Rep3 ( 350 nm - 600 nm) 70500 µW/cm² = 705 W/m² VIS Rep4 ( 350 nm - 700 nm) 87800 µW/cm² = 878 W/m² purple ( 380 nm - 420 nm) 13100 µW/cm² = 131 W/m² VIS ( 380 nm - 780 nm) 88200 µW/cm² = 882 W/m² VIS2 ( 400 nm - 680 nm) 68000 µW/cm² = 680 W/m² PAR ( 400 nm - 700 nm) 71100 µW/cm² = 711 W/m² tmp ( 400 nm - 1100 nm) 105000 µW/cm² = 1050 W/m² blue ( 420 nm - 490 nm) 21000 µW/cm² = 210 W/m² green ( 490 nm - 575 nm) 21000 µW/cm² = 210 W/m² yellow ( 575 nm - 585 nm) 2150 µW/cm² = 21.5 W/m² orange ( 585 nm - 650 nm) 12500 µW/cm² = 125 W/m² red ( 650 nm - 780 nm) 18400 µW/cm² = 184 W/m² IRA ( 700 nm - 1400 nm) 43400 µW/cm² = 434 W/m² IR2 ( 720 nm - 1100 nm) 31200 µW/cm² = 312 W/m² IRB ( 1400 nm - 3000 nm) 10500 µW/cm² = 105 W/m²
Actionspectra
Erythema 5780 UV-Index Pyrimidine dimerization of DNA 5150 µW/cm² Photoceratitis 7080 µW/cm² Photoconjunctivitis 10800 µW/cm² DNA Damage 14500 Vitamin D3 8230 µW/cm² Photosynthesis 51400 µW/cm² Luminosity 177000 lx Human L-Cone 26100 µW/cm² Human M-Cone 22800 µW/cm² Human S-Cone 17700 µW/cm² CIE X 23700 µW/cm² CIE Y 24400 µW/cm² CIE Z 32100 µW/cm² PAR 331000000 mol photons Extinction preD3 133000 e-3*m²/mol Extinction Tachysterol 282000 e-3*m²/mol Exctincition PreD3 113000000 m²/mol Extinction Lumisterol 99600 m²/mol Exctincition Tachysterol 342000000 m²/mol Extinction 7DHC 113000 m²/mol L-Cone 21600 µW/cm² M-Cone 27000 µW/cm² S-Cone 30900 µW/cm² U-Cone 33200 µW/cm² UVR - ICNIRP 2004 11800 Rel Biol Eff Melatonin Supression 25900 µW/cm² Blue Light Hazard 21000 µW/cm² (118 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 8340 µW/cm² Lumen Reptil 238000 "pseudo-lx" Vitamin D3 Degradation 6450 µW/cm² Actinic UV 11800 µW/cm² (667 mW/klm) Exctincition Lumisterol 98800000 m²/mol Exctincition 7DHC 116000000 m²/mol Exctincition Toxisterols 65300000 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 24500 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 3140 Leybold UVB 8750 µW/cm² Leybold UVA 14600 µW/cm² Leybold UVC 8210 µW/cm² DeltaOhm UVB 14200 µW/cm² DeltaOhm UVC 13100 µW/cm² Vernier UVB 7550 µW/cm² Vernier UVA 15500 µW/cm² Gröbel UVA 17900 µW/cm² Gröbel UVB 10500 µW/cm² Gröbel UVC 9240 µW/cm² Luxmeter 181000 lx Solarmeter 6.4 (D3) 9820 IU/min UVX-31 15600 µW/cm² IL UVB 9.79 µW/cm² IL UVA 17200 µW/cm² Solarmeter 6.5 (UVI, post 2010) 2140 UV-Index Solarmeter 6.2 (UVB, post 2010) 9680 µW/cm² (Solarmeter Ratio = 4.52) Solarmeter AlGaN 6.5 UVI sensor 10900 UV Index GenUV 7.1 UV-Index 864 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 1450 W/m² Solarmeter 4.0 (UVA) 266 mW/cm² LS122 (manuf.) 375 W/m² ISM400 (first guess) 1200 W/m² LS122 (assumption) 370 W/m² ISM400_new 1220 W/m² Solarmeter 10.0 (Global Power) (assumption) 1320 W/m²