7500 Kelvin
Spectrum 135: SW-BB7500 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-BB7500 (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 ; 0.31 ) | ( 0.31 ; 0.34 ) | ( 0.2 ; 0.24 ; 0.27 ) |
| CCT | 7500 Kelvin | 7500 Kelvin | 7500 Kelvin |
| distance | 0.0002 | 0.00047 | |
| 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) 143000 µW/cm² = 1430 W/m² UVC ( 0 nm - 280 nm) 11900 µW/cm² = 119 W/m² non-terrestrial ( 0 nm - 290 nm) 13800 µW/cm² = 138 W/m² total2 ( 250 nm - 880 nm) 105000 µW/cm² = 1050 W/m² UVB (EU) ( 280 nm - 315 nm) 7080 µW/cm² = 70.8 W/m² UVB (US) ( 280 nm - 320 nm) 8180 µW/cm² = 81.8 W/m² UVA+B ( 280 nm - 380 nm) 22400 µW/cm² = 224 W/m² Solar UVB ( 290 nm - 315 nm) 5190 µW/cm² = 51.9 W/m² UVA D3 regulating ( 315 nm - 335 nm) 4510 µW/cm² = 45.1 W/m² UVA (EU) ( 315 nm - 380 nm) 15300 µW/cm² = 153 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 4570 µW/cm² = 45.7 W/m² UVA (US) ( 320 nm - 380 nm) 14200 µW/cm² = 142 W/m² UVA1 (variant) ( 335 nm - 380 nm) 10800 µW/cm² = 108 W/m² UVA1 (medical) ( 340 nm - 400 nm) 14500 µW/cm² = 145 W/m² vis. UVA ( 350 nm - 380 nm) 7240 µW/cm² = 72.4 W/m² VIS Rep3 ( 350 nm - 600 nm) 53800 µW/cm² = 538 W/m² VIS Rep4 ( 350 nm - 700 nm) 68100 µW/cm² = 681 W/m² purple ( 380 nm - 420 nm) 9710 µW/cm² = 97.1 W/m² VIS ( 380 nm - 780 nm) 69600 µW/cm² = 696 W/m² VIS2 ( 400 nm - 680 nm) 53500 µW/cm² = 535 W/m² PAR ( 400 nm - 700 nm) 56000 µW/cm² = 560 W/m² tmp ( 400 nm - 1100 nm) 85000 µW/cm² = 850 W/m² blue ( 420 nm - 490 nm) 16000 µW/cm² = 160 W/m² green ( 490 nm - 575 nm) 16600 µW/cm² = 166 W/m² yellow ( 575 nm - 585 nm) 1730 µW/cm² = 17.3 W/m² orange ( 585 nm - 650 nm) 10200 µW/cm² = 102 W/m² red ( 650 nm - 780 nm) 15400 µW/cm² = 154 W/m² IRA ( 700 nm - 1400 nm) 37300 µW/cm² = 373 W/m² IR2 ( 720 nm - 1100 nm) 26600 µW/cm² = 266 W/m² IRB ( 1400 nm - 3000 nm) 9460 µW/cm² = 94.6 W/m²
Actionspectra
Erythema 3750 UV-Index Pyrimidine dimerization of DNA 3460 µW/cm² Photoceratitis 4610 µW/cm² Photoconjunctivitis 6730 µW/cm² DNA Damage 9070 Vitamin D3 5440 µW/cm² Photosynthesis 40300 µW/cm² Luminosity 141000 lx Human L-Cone 20900 µW/cm² Human M-Cone 18100 µW/cm² Human S-Cone 13500 µW/cm² CIE X 18900 µW/cm² CIE Y 19500 µW/cm² CIE Z 24500 µW/cm² PAR 262000000 mol photons Extinction preD3 84600 e-3*m²/mol Extinction Tachysterol 182000 e-3*m²/mol Exctincition PreD3 71800000 m²/mol Extinction Lumisterol 63500 m²/mol Exctincition Tachysterol 222000000 m²/mol Extinction 7DHC 72300 m²/mol L-Cone 17400 µW/cm² M-Cone 21000 µW/cm² S-Cone 23400 µW/cm² U-Cone 24300 µW/cm² UVR - ICNIRP 2004 7560 Rel Biol Eff Melatonin Supression 19800 µW/cm² Blue Light Hazard 15900 µW/cm² (113 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 5520 µW/cm² Lumen Reptil 184000 "pseudo-lx" Vitamin D3 Degradation 4250 µW/cm² Actinic UV 7560 µW/cm² (535 mW/klm) Exctincition Lumisterol 63600000 m²/mol Exctincition 7DHC 74600000 m²/mol Exctincition Toxisterols 40400000 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 16200 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 2070 Leybold UVB 5890 µW/cm² Leybold UVA 10400 µW/cm² Leybold UVC 5120 µW/cm² DeltaOhm UVB 9650 µW/cm² DeltaOhm UVC 8270 µW/cm² Vernier UVB 5040 µW/cm² Vernier UVA 10900 µW/cm² Gröbel UVA 12700 µW/cm² Gröbel UVB 6990 µW/cm² Gröbel UVC 5760 µW/cm² Luxmeter 144000 lx Solarmeter 6.4 (D3) 6470 IU/min UVX-31 10600 µW/cm² IL UVB 6.49 µW/cm² IL UVA 12200 µW/cm² Solarmeter 6.5 (UVI, post 2010) 1400 UV-Index Solarmeter 6.2 (UVB, post 2010) 6440 µW/cm² (Solarmeter Ratio = 4.58) Solarmeter AlGaN 6.5 UVI sensor 7270 UV Index GenUV 7.1 UV-Index 563 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 1160 W/m² Solarmeter 4.0 (UVA) 190 mW/cm² LS122 (manuf.) 330 W/m² ISM400 (first guess) 995 W/m² LS122 (assumption) 323 W/m² ISM400_new 1020 W/m² Solarmeter 10.0 (Global Power) (assumption) 1080 W/m²