5500 Kelvin
Spectrum 131: SW-BB5500 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-BB5500 (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 | ( 0.33 ; 0.34 ) | ( 0.37 ; 0.34 ) | ( 0.27 ; 0.27 ; 0.25 ) |
| CCT | 5500 Kelvin | 5500 Kelvin | 5500 Kelvin |
| distance | 0.00017 | 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) 276000 µW/cm² = 2760 W/m² UVC ( 0 nm - 280 nm) 4220 µW/cm² = 42.2 W/m² non-terrestrial ( 0 nm - 290 nm) 5320 µW/cm² = 53.2 W/m² total2 ( 250 nm - 880 nm) 167000 µW/cm² = 1670 W/m² UVB (EU) ( 280 nm - 315 nm) 4530 µW/cm² = 45.3 W/m² UVB (US) ( 280 nm - 320 nm) 5340 µW/cm² = 53.4 W/m² UVA+B ( 280 nm - 380 nm) 18200 µW/cm² = 182 W/m² Solar UVB ( 290 nm - 315 nm) 3440 µW/cm² = 34.4 W/m² UVA D3 regulating ( 315 nm - 335 nm) 3500 µW/cm² = 35 W/m² UVA (EU) ( 315 nm - 380 nm) 13600 µW/cm² = 136 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 3660 µW/cm² = 36.6 W/m² UVA (US) ( 320 nm - 380 nm) 12800 µW/cm² = 128 W/m² UVA1 (variant) ( 335 nm - 380 nm) 10100 µW/cm² = 101 W/m² UVA1 (medical) ( 340 nm - 400 nm) 14600 µW/cm² = 146 W/m² vis. UVA ( 350 nm - 380 nm) 7100 µW/cm² = 71 W/m² VIS Rep3 ( 350 nm - 600 nm) 78500 µW/cm² = 785 W/m² VIS Rep4 ( 350 nm - 700 nm) 110000 µW/cm² = 1100 W/m² purple ( 380 nm - 420 nm) 11200 µW/cm² = 112 W/m² VIS ( 380 nm - 780 nm) 124000 µW/cm² = 1240 W/m² PAR ( 400 nm - 700 nm) 97200 µW/cm² = 972 W/m² blue ( 420 nm - 490 nm) 22700 µW/cm² = 227 W/m² green ( 490 nm - 575 nm) 29100 µW/cm² = 291 W/m² yellow ( 575 nm - 585 nm) 3370 µW/cm² = 33.7 W/m² orange ( 585 nm - 650 nm) 21100 µW/cm² = 211 W/m² red ( 650 nm - 780 nm) 36600 µW/cm² = 366 W/m² IRA ( 700 nm - 1400 nm) 108000 µW/cm² = 1080 W/m² IRB ( 1400 nm - 3000 nm) 36600 µW/cm² = 366 W/m²
Actionspectra
Erythema 2040 UV-Index Pyrimidine dimerization of DNA 2300 µW/cm² Photoceratitis 2580 µW/cm² Photoconjunctivitis 2960 µW/cm² DNA Damage 3990 Vitamin D3 3300 µW/cm² Photosynthesis 69100 µW/cm² Luminosity 260000 lx Human L-Cone 39000 µW/cm² Human M-Cone 32200 µW/cm² Human S-Cone 18700 µW/cm² CIE X 35200 µW/cm² CIE Y 36100 µW/cm² CIE Z 34500 µW/cm² PAR 461000000 mol photons Extinction preD3 41100 e-3*m²/mol Extinction Tachysterol 98400 e-3*m²/mol Exctincition PreD3 34500000 m²/mol Extinction Lumisterol 31700 m²/mol Exctincition Tachysterol 122000000 m²/mol Extinction 7DHC 37200 m²/mol L-Cone 33400 µW/cm² M-Cone 34000 µW/cm² S-Cone 31500 µW/cm² U-Cone 26400 µW/cm² UVR - ICNIRP 2004 3850 Rel Biol Eff Melatonin Supression 28500 µW/cm² Blue Light Hazard 21900 µW/cm² (83.9 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 3360 µW/cm² Lumen Reptil 283000 "pseudo-lx" Vitamin D3 Degradation 2530 µW/cm² Actinic UV 3850 µW/cm² (148 mW/klm) Exctincition Lumisterol 32900000 m²/mol Exctincition 7DHC 39200000 m²/mol Exctincition Toxisterols 16600000 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 9680 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 1230 Leybold UVB 3970 µW/cm² Leybold UVA 9570 µW/cm² Leybold UVC 2220 µW/cm² DeltaOhm UVB 6820 µW/cm² DeltaOhm UVC 3940 µW/cm² Vernier UVB 3210 µW/cm² Vernier UVA 9240 µW/cm² Gröbel UVA 11300 µW/cm² Gröbel UVB 4350 µW/cm² Gröbel UVC 2510 µW/cm² Solarmeter 6.4 (D3) 3850 IU/min UVX-31 7580 µW/cm² IL UVB 4.02 µW/cm² IL UVA 11300 µW/cm² Solarmeter 6.5 (UVI, post 2010) 811 UV-Index Solarmeter 6.2 (UVB, post 2010) 4080 µW/cm² (Solarmeter Ratio = 5.03) Solarmeter AlGaN 6.5 UVI sensor 4540 UV Index GenUV 7.1 UV-Index 319 UV-Index Solarmeter 10.0 (Global Power) 2430 W/m² Solarmeter 4.0 (UVA) 181 mW/cm² LS122 714 W/m² ISM400 2410 W/m²