3500 Kelvin
Spectrum 127: SW-BB3500 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-BB3500 (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 | ( 0.41 ; 0.39 ) | ( 0.51 ; 0.32 ) | ( 0.43 ; 0.29 ; 0.18 ) |
| CCT | 3500 Kelvin | 3500 Kelvin | 3500 Kelvin |
| distance | 0.00017 | 0.00097 | |
| 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) 452000 µW/cm² = 4520 W/m² UVC ( 0 nm - 280 nm) 114 µW/cm² = 1.14 W/m² non-terrestrial ( 0 nm - 290 nm) 172 µW/cm² = 1.72 W/m² total2 ( 250 nm - 880 nm) 132000 µW/cm² = 1320 W/m² UVB (EU) ( 280 nm - 315 nm) 306 µW/cm² = 3.06 W/m² UVB (US) ( 280 nm - 320 nm) 379 µW/cm² = 3.79 W/m² UVA+B ( 280 nm - 380 nm) 2230 µW/cm² = 22.3 W/m² Solar UVB ( 290 nm - 315 nm) 248 µW/cm² = 2.48 W/m² UVA D3 regulating ( 315 nm - 335 nm) 353 µW/cm² = 3.53 W/m² UVA (EU) ( 315 nm - 380 nm) 1930 µW/cm² = 19.3 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 396 µW/cm² = 3.96 W/m² UVA (US) ( 320 nm - 380 nm) 1850 µW/cm² = 18.5 W/m² UVA1 (variant) ( 335 nm - 380 nm) 1570 µW/cm² = 15.7 W/m² UVA1 (medical) ( 340 nm - 400 nm) 2620 µW/cm² = 26.2 W/m² vis. UVA ( 350 nm - 380 nm) 1190 µW/cm² = 11.9 W/m² VIS Rep3 ( 350 nm - 600 nm) 36300 µW/cm² = 363 W/m² VIS Rep4 ( 350 nm - 700 nm) 67000 µW/cm² = 670 W/m² purple ( 380 nm - 420 nm) 2680 µW/cm² = 26.8 W/m² VIS ( 380 nm - 780 nm) 93600 µW/cm² = 936 W/m² VIS2 ( 400 nm - 680 nm) 58000 µW/cm² = 580 W/m² PAR ( 400 nm - 700 nm) 64600 µW/cm² = 646 W/m² tmp ( 400 nm - 1100 nm) 202000 µW/cm² = 2020 W/m² blue ( 420 nm - 490 nm) 8520 µW/cm² = 85.2 W/m² green ( 490 nm - 575 nm) 17500 µW/cm² = 175 W/m² yellow ( 575 nm - 585 nm) 2530 µW/cm² = 25.3 W/m² orange ( 585 nm - 650 nm) 18500 µW/cm² = 185 W/m² red ( 650 nm - 780 nm) 43900 µW/cm² = 439 W/m² IRA ( 700 nm - 1400 nm) 213000 µW/cm² = 2130 W/m² IR2 ( 720 nm - 1100 nm) 130000 µW/cm² = 1300 W/m² IRB ( 1400 nm - 3000 nm) 137000 µW/cm² = 1370 W/m²
Actionspectra
Erythema 101 UV-Index Pyrimidine dimerization of DNA 167 µW/cm² Photoceratitis 135 µW/cm² Photoconjunctivitis 97.1 µW/cm² DNA Damage 134 Vitamin D3 199 µW/cm² Photosynthesis 45600 µW/cm² Luminosity 178000 lx Human L-Cone 27500 µW/cm² Human M-Cone 20400 µW/cm² Human S-Cone 6810 µW/cm² CIE X 25700 µW/cm² CIE Y 24800 µW/cm² CIE Z 12900 µW/cm² PAR 318000000 mol photons Extinction preD3 1740 e-3*m²/mol Extinction Tachysterol 4970 e-3*m²/mol Exctincition PreD3 1380000 m²/mol Extinction Lumisterol 1350 m²/mol Exctincition Tachysterol 6400000 m²/mol Extinction 7DHC 1650 m²/mol L-Cone 25000 µW/cm² M-Cone 17100 µW/cm² S-Cone 10600 µW/cm² U-Cone 5610 µW/cm² UVR - ICNIRP 2004 172 Rel Biol Eff Melatonin Supression 11300 µW/cm² Blue Light Hazard 7790 µW/cm² (43.7 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 205 µW/cm² Lumen Reptil 147000 "pseudo-lx" Vitamin D3 Degradation 150 µW/cm² Actinic UV 172 µW/cm² (9.64 mW/klm) Exctincition Lumisterol 1480000 m²/mol Exctincition 7DHC 1790000 m²/mol Exctincition Toxisterols 465000 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 605 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 71.3 Leybold UVB 299 µW/cm² Leybold UVA 1430 µW/cm² Leybold UVC 67.2 µW/cm² DeltaOhm UVB 584 µW/cm² DeltaOhm UVC 172 µW/cm² Vernier UVB 214 µW/cm² Vernier UVA 1170 µW/cm² Gröbel UVA 1580 µW/cm² Gröbel UVB 279 µW/cm² Gröbel UVC 78.4 µW/cm² Luxmeter 174000 lx Solarmeter 6.4 (D3) 223 IU/min UVX-31 676 µW/cm² IL UVB 0.266 µW/cm² IL UVA 1690 µW/cm² Solarmeter 6.5 (UVI, post 2010) 45.6 UV-Index Solarmeter 6.2 (UVB, post 2010) 285 µW/cm² (Solarmeter Ratio = 6.25) Solarmeter AlGaN 6.5 UVI sensor 295 UV Index GenUV 7.1 UV-Index 18.4 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 2960 W/m² Solarmeter 4.0 (UVA) 29.8 mW/cm² LS122 (manuf.) 2910 W/m² ISM400 (first guess) 3430 W/m² LS122 (assumption) 2700 W/m² ISM400_new 3980 W/m² Solarmeter 10.0 (Global Power) (assumption) 3030 W/m²