KC 2.7
Spectrum 678: TG-PRO-LED-0001 Edit
DeleteMeasurement
| Brand |
other other |
|---|---|
| Lamp Product |
Prototype Homemade LED |
| Lamp ID |
TG-PRO-LED-0001 (02/2023) Prototype LED |
| Spectrometer | FLAME UV-Vis (E) |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 25 cm |
| Age | 50 hours |
| Originator (measurement) | Thomas Griffiths |
Database entry created:
Thomas Griffiths (Tomaskas Ltd.)
25/Feb/2023 ; updated:
Thomas Griffiths (Tomaskas Ltd.)
4/May/2024
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 ; 0.33 ) | ( 0.33 ; 0.35 ) | ( 0.26 ; 0.25 ; 0.26 ) |
| CCT | 5700 Kelvin | 6500 Kelvin | 5800 Kelvin |
| distance | 0.0034 | 0.02 | |
| 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) 3720 µW/cm² = 37.2 W/m² UVC ( 0 nm - 280 nm) 0 µW/cm² = 0 W/m² non-terrestrial ( 0 nm - 290 nm) 0 µW/cm² = 0 W/m² total2 ( 250 nm - 880 nm) 3720 µW/cm² = 37.2 W/m² UVB (EU) ( 280 nm - 315 nm) 0 µW/cm² = 0 W/m² UVB (US) ( 280 nm - 320 nm) 0 µW/cm² = 0 W/m² UVA+B ( 280 nm - 380 nm) 253 µW/cm² = 2.53 W/m² Solar UVB ( 290 nm - 315 nm) 0 µW/cm² = 0 W/m² UVA D3 regulating ( 315 nm - 335 nm) 1.44 µW/cm² = 0.0144 W/m² UVA (EU) ( 315 nm - 380 nm) 253 µW/cm² = 2.53 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 1.96 µW/cm² = 0.0196 W/m² UVA (US) ( 320 nm - 380 nm) 253 µW/cm² = 2.53 W/m² UVA1 (variant) ( 335 nm - 380 nm) 251 µW/cm² = 2.51 W/m² UVA1 (medical) ( 340 nm - 400 nm) 536 µW/cm² = 5.36 W/m² vis. UVA ( 350 nm - 380 nm) 250 µW/cm² = 2.5 W/m² VIS Rep3 ( 350 nm - 600 nm) 2750 µW/cm² = 27.5 W/m² VIS Rep4 ( 350 nm - 700 nm) 3620 µW/cm² = 36.2 W/m² purple ( 380 nm - 420 nm) 337 µW/cm² = 3.37 W/m² VIS ( 380 nm - 780 nm) 3460 µW/cm² = 34.6 W/m² PAR ( 400 nm - 700 nm) 3080 µW/cm² = 30.8 W/m² blue ( 420 nm - 490 nm) 835 µW/cm² = 8.35 W/m² green ( 490 nm - 575 nm) 1020 µW/cm² = 10.2 W/m² yellow ( 575 nm - 585 nm) 122 µW/cm² = 1.22 W/m² orange ( 585 nm - 650 nm) 779 µW/cm² = 7.79 W/m² red ( 650 nm - 780 nm) 363 µW/cm² = 3.63 W/m² IRA ( 700 nm - 1400 nm) 93.8 µW/cm² = 0.938 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 0.057 UV-Index Pyrimidine dimerization of DNA 0.0408 µW/cm² Photoceratitis 0 µW/cm² Photoconjunctivitis 0 µW/cm² DNA Damage 0.000166 Vitamin D3 0 µW/cm² Photosynthesis 2120 µW/cm² Luminosity 9360 lx Human L-Cone 1400 µW/cm² Human M-Cone 1150 µW/cm² Human S-Cone 714 µW/cm² CIE X 1300 µW/cm² CIE Y 1300 µW/cm² CIE Z 1380 µW/cm² PAR 14300000 mol photons Extinction preD3 0.161 e-3*m²/mol Extinction Tachysterol 0.733 e-3*m²/mol Exctincition PreD3 131 m²/mol Extinction Lumisterol 0 m²/mol Exctincition Tachysterol 1850 m²/mol Extinction 7DHC 0 m²/mol L-Cone 1200 µW/cm² M-Cone 1140 µW/cm² S-Cone 1180 µW/cm² U-Cone 1100 µW/cm² UVR - ICNIRP 2004 0.0374 Rel Biol Eff Melatonin Supression 980 µW/cm² Blue Light Hazard 752 µW/cm² (80.4 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 0 µW/cm² Lumen Reptil 10100 "pseudo-lx" Vitamin D3 Degradation 0.0373 µW/cm² Actinic UV 0.0374 µW/cm² (0.0399 mW/klm) Exctincition Lumisterol 4.83 m²/mol Exctincition 7DHC 0.652 m²/mol Exctincition Toxisterols 48.6 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 2.38 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 0.0253 Leybold UVB 0.177 µW/cm² Leybold UVA 185 µW/cm² Leybold UVC 0 µW/cm² DeltaOhm UVB 1.39 µW/cm² DeltaOhm UVC 0.125 µW/cm² Vernier UVB -3.4E-5 µW/cm² Vernier UVA 74.1 µW/cm² Gröbel UVA 190 µW/cm² Gröbel UVB 0.0192 µW/cm² Gröbel UVC 0 µW/cm² Solarmeter 6.4 (D3) 0.079 IU/min UVX-31 5.57 µW/cm² IL UVB 0.000855 µW/cm² IL UVA 246 µW/cm² Solarmeter 6.5 (UVI, post 2010) 0.00802 UV-Index Solarmeter 6.2 (UVB, post 2010) 0.39 µW/cm² (Solarmeter Ratio = 48.7) Solarmeter AlGaN 6.5 UVI sensor 0.0849 UV Index GenUV 7.1 UV-Index 0.092 UV-Index Solarmeter 10.0 (Global Power) 36.8 W/m² Solarmeter 4.0 (UVA) 5.19 mW/cm² LS122 0.00116 W/m² ISM400 24.9 W/m²