Mod 5
Spectrum 677: 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.)
25/Feb/2023
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 | ( 0.29 ; 0.3 ) | ( 0.36 ; 0.38 ) | ( 0.23 ; 0.27 ; 0.29 ) |
| CCT | 8500 Kelvin | 5800 Kelvin | 6200 Kelvin |
| distance | 0.039 | 0.035 | |
| 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) 1380 µW/cm² = 13.8 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) 1380 µW/cm² = 13.8 W/m² UVB (EU) ( 280 nm - 315 nm) 81.8 µW/cm² = 0.818 W/m² UVB (US) ( 280 nm - 320 nm) 113 µW/cm² = 1.13 W/m² UVA+B ( 280 nm - 380 nm) 473 µW/cm² = 4.73 W/m² Solar UVB ( 290 nm - 315 nm) 81.8 µW/cm² = 0.818 W/m² UVA D3 regulating ( 315 nm - 335 nm) 162 µW/cm² = 1.62 W/m² UVA (EU) ( 315 nm - 380 nm) 392 µW/cm² = 3.92 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 170 µW/cm² = 1.7 W/m² UVA (US) ( 320 nm - 380 nm) 360 µW/cm² = 3.6 W/m² UVA1 (variant) ( 335 nm - 380 nm) 229 µW/cm² = 2.29 W/m² UVA1 (medical) ( 340 nm - 400 nm) 206 µW/cm² = 2.06 W/m² vis. UVA ( 350 nm - 380 nm) 134 µW/cm² = 1.34 W/m² VIS Rep3 ( 350 nm - 600 nm) 867 µW/cm² = 8.67 W/m² VIS Rep4 ( 350 nm - 700 nm) 1020 µW/cm² = 10.2 W/m² purple ( 380 nm - 420 nm) 19.4 µW/cm² = 0.194 W/m² VIS ( 380 nm - 780 nm) 896 µW/cm² = 8.96 W/m² PAR ( 400 nm - 700 nm) 870 µW/cm² = 8.7 W/m² blue ( 420 nm - 490 nm) 314 µW/cm² = 3.14 W/m² green ( 490 nm - 575 nm) 311 µW/cm² = 3.11 W/m² yellow ( 575 nm - 585 nm) 37.2 µW/cm² = 0.372 W/m² orange ( 585 nm - 650 nm) 166 µW/cm² = 1.66 W/m² red ( 650 nm - 780 nm) 48.3 µW/cm² = 0.483 W/m² IRA ( 700 nm - 1400 nm) 19.9 µW/cm² = 0.199 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 6.26 UV-Index Pyrimidine dimerization of DNA 56.3 µW/cm² Photoceratitis 9.54 µW/cm² Photoconjunctivitis 0.205 µW/cm² DNA Damage 0.687 Vitamin D3 28.2 µW/cm² Photosynthesis 604 µW/cm² Luminosity 2710 lx Human L-Cone 397 µW/cm² Human M-Cone 352 µW/cm² Human S-Cone 257 µW/cm² CIE X 357 µW/cm² CIE Y 376 µW/cm² CIE Z 501 µW/cm² PAR 3840000 mol photons Extinction preD3 147 e-3*m²/mol Extinction Tachysterol 509 e-3*m²/mol Exctincition PreD3 68900 m²/mol Extinction Lumisterol 28.8 m²/mol Exctincition Tachysterol 708000 m²/mol Extinction 7DHC 25.1 m²/mol L-Cone 325 µW/cm² M-Cone 379 µW/cm² S-Cone 406 µW/cm² U-Cone 277 µW/cm² UVR - ICNIRP 2004 5.27 Rel Biol Eff Melatonin Supression 349 µW/cm² Blue Light Hazard 272 µW/cm² (100 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 32 µW/cm² Lumen Reptil 2990 "pseudo-lx" Vitamin D3 Degradation 24.7 µW/cm² Actinic UV 5.21 µW/cm² (19.2 mW/klm) Exctincition Lumisterol 39300 m²/mol Exctincition 7DHC 32000 m²/mol Exctincition Toxisterols 10400 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 140 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 8.03 Leybold UVB 105 µW/cm² Leybold UVA 224 µW/cm² Leybold UVC 0.0101 µW/cm² DeltaOhm UVB 220 µW/cm² DeltaOhm UVC 28.9 µW/cm² Vernier UVB 47.1 µW/cm² Vernier UVA 260 µW/cm² Gröbel UVA 307 µW/cm² Gröbel UVB 58.8 µW/cm² Gröbel UVC -0.0152 µW/cm² Solarmeter 6.4 (D3) 25.1 IU/min UVX-31 236 µW/cm² IL UVB 0.0612 µW/cm² IL UVA 274 µW/cm² Solarmeter 6.5 (UVI, post 2010) 6.48 UV-Index Solarmeter 6.2 (UVB, post 2010) 90.7 µW/cm² (Solarmeter Ratio = 14) Solarmeter AlGaN 6.5 UVI sensor 73.1 UV Index GenUV 7.1 UV-Index 3.81 UV-Index Solarmeter 10.0 (Global Power) 11.1 W/m² Solarmeter 4.0 (UVA) 3.7 mW/cm² LS122 0.0151 W/m² ISM400 6.26 W/m²