6500 Kelvin
Spectrum 133: SW-BB6500 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-BB6500 (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 ) | ( 0.33 ; 0.34 ) | ( 0.23 ; 0.26 ; 0.26 ) |
| CCT | 6500 Kelvin | 6500 Kelvin | 6500 Kelvin |
| distance | 9.3E-5 | 0.00032 | |
| 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) 269000 µW/cm² = 2690 W/m² UVC ( 0 nm - 280 nm) 11200 µW/cm² = 112 W/m² non-terrestrial ( 0 nm - 290 nm) 13500 µW/cm² = 135 W/m² total2 ( 250 nm - 880 nm) 186000 µW/cm² = 1860 W/m² UVB (EU) ( 280 nm - 315 nm) 8750 µW/cm² = 87.5 W/m² UVB (US) ( 280 nm - 320 nm) 10200 µW/cm² = 102 W/m² UVA+B ( 280 nm - 380 nm) 30500 µW/cm² = 305 W/m² Solar UVB ( 290 nm - 315 nm) 6510 µW/cm² = 65.1 W/m² UVA D3 regulating ( 315 nm - 335 nm) 6040 µW/cm² = 60.4 W/m² UVA (EU) ( 315 nm - 380 nm) 21700 µW/cm² = 217 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 6210 µW/cm² = 62.1 W/m² UVA (US) ( 320 nm - 380 nm) 20300 µW/cm² = 203 W/m² UVA1 (variant) ( 335 nm - 380 nm) 15700 µW/cm² = 157 W/m² UVA1 (medical) ( 340 nm - 400 nm) 21600 µW/cm² = 216 W/m² vis. UVA ( 350 nm - 380 nm) 10700 µW/cm² = 107 W/m² VIS Rep3 ( 350 nm - 600 nm) 93600 µW/cm² = 936 W/m² VIS Rep4 ( 350 nm - 700 nm) 123000 µW/cm² = 1230 W/m² purple ( 380 nm - 420 nm) 15400 µW/cm² = 154 W/m² VIS ( 380 nm - 780 nm) 131000 µW/cm² = 1310 W/m² VIS2 ( 400 nm - 680 nm) 99400 µW/cm² = 994 W/m² PAR ( 400 nm - 700 nm) 105000 µW/cm² = 1050 W/m² tmp ( 400 nm - 1100 nm) 171000 µW/cm² = 1710 W/m² blue ( 420 nm - 490 nm) 27700 µW/cm² = 277 W/m² green ( 490 nm - 575 nm) 31400 µW/cm² = 314 W/m² yellow ( 575 nm - 585 nm) 3420 µW/cm² = 34.2 W/m² orange ( 585 nm - 650 nm) 20600 µW/cm² = 206 W/m² red ( 650 nm - 780 nm) 33000 µW/cm² = 330 W/m² IRA ( 700 nm - 1400 nm) 86600 µW/cm² = 866 W/m² IR2 ( 720 nm - 1100 nm) 60900 µW/cm² = 609 W/m² IRB ( 1400 nm - 3000 nm) 24800 µW/cm² = 248 W/m²
Actionspectra
Erythema 4310 UV-Index Pyrimidine dimerization of DNA 4350 µW/cm² Photoceratitis 5370 µW/cm² Photoconjunctivitis 7080 µW/cm² DNA Damage 9520 Vitamin D3 6570 µW/cm² Photosynthesis 75000 µW/cm² Luminosity 272000 lx Human L-Cone 40400 µW/cm² Human M-Cone 34300 µW/cm² Human S-Cone 23100 µW/cm² CIE X 36500 µW/cm² CIE Y 37600 µW/cm² CIE Z 42200 µW/cm² PAR 492000000 mol photons Extinction preD3 92600 e-3*m²/mol Extinction Tachysterol 209000 e-3*m²/mol Exctincition PreD3 78300000 m²/mol Extinction Lumisterol 70400 m²/mol Exctincition Tachysterol 257000000 m²/mol Extinction 7DHC 81300 m²/mol L-Cone 34000 µW/cm² M-Cone 38400 µW/cm² S-Cone 39500 µW/cm² U-Cone 37500 µW/cm² UVR - ICNIRP 2004 8450 Rel Biol Eff Melatonin Supression 34400 µW/cm² Blue Light Hazard 27100 µW/cm² (99.7 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 6680 µW/cm² Lumen Reptil 327000 "pseudo-lx" Vitamin D3 Degradation 5090 µW/cm² Actinic UV 8450 µW/cm² (310 mW/klm) Exctincition Lumisterol 71700000 m²/mol Exctincition 7DHC 84600000 m²/mol Exctincition Toxisterols 41300000 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 19400 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 2480 Leybold UVB 7440 µW/cm² Leybold UVA 15000 µW/cm² Leybold UVC 5360 µW/cm² DeltaOhm UVB 12400 µW/cm² DeltaOhm UVC 8950 µW/cm² Vernier UVB 6220 µW/cm² Vernier UVA 15100 µW/cm² Gröbel UVA 18000 µW/cm² Gröbel UVB 8530 µW/cm² Gröbel UVC 6030 µW/cm² Luxmeter 277000 lx Solarmeter 6.4 (D3) 7750 IU/min UVX-31 13700 µW/cm² IL UVB 7.9 µW/cm² IL UVA 17600 µW/cm² Solarmeter 6.5 (UVI, post 2010) 1660 UV-Index Solarmeter 6.2 (UVB, post 2010) 7900 µW/cm² (Solarmeter Ratio = 4.76) Solarmeter AlGaN 6.5 UVI sensor 8890 UV Index GenUV 7.1 UV-Index 658 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 2330 W/m² Solarmeter 4.0 (UVA) 277 mW/cm² LS122 (manuf.) 811 W/m² ISM400 (first guess) 2130 W/m² LS122 (assumption) 785 W/m² ISM400_new 2240 W/m² Solarmeter 10.0 (Global Power) (assumption) 2220 W/m²