at the center (blueish spot from the primary blue LED)
Spectrum 553: WL01 Edit
DeleteMeasurement
| Brand |
Lightstorm https://jetter-terraristikbedarf.de/ |
|---|---|
| Lamp Product |
UVB LED |
| Lamp ID |
WL01 (11/2020) |
| Spectrometer | USB2000+ |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 10 cm |
| Age | 8 hours |
| Originator (measurement) | Sarina Wunderlich |
Database entry created:
Sarina Wunderlich
10/Nov/2020 ; updated:
Sarina Wunderlich
6/Nov/2022
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 | ( 0.36 ; 0.36 ) | ( 0.39 ; 0.33 ) | ( 0.33 ; 0.26 ; 0.22 ) |
| CCT | 4500 Kelvin | 5000 Kelvin | 4500 Kelvin |
| distance | 0.014 | 0.025 | |
| 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) 1210 µW/cm² = 12.1 W/m² UVC ( 0 nm - 280 nm) 41 µW/cm² = 0.41 W/m² non-terrestrial ( 0 nm - 290 nm) 63.2 µW/cm² = 0.632 W/m² total2 ( 250 nm - 880 nm) 1210 µW/cm² = 12.1 W/m² UVB (EU) ( 280 nm - 315 nm) 28 µW/cm² = 0.28 W/m² UVB (US) ( 280 nm - 320 nm) 28.3 µW/cm² = 0.283 W/m² UVA+B ( 280 nm - 380 nm) 41.5 µW/cm² = 0.415 W/m² Solar UVB ( 290 nm - 315 nm) 5.88 µW/cm² = 0.0588 W/m² UVA2 ( 315 nm - 335 nm) 0.677 µW/cm² = 0.00677 W/m² UVA (EU) ( 315 nm - 400 nm) 115 µW/cm² = 1.15 W/m² UVA2(US) ( 320 nm - 350 nm) 0.84 µW/cm² = 0.0084 W/m² UVA (US) ( 320 nm - 400 nm) 115 µW/cm² = 1.15 W/m² UVA1 (variant) ( 335 nm - 380 nm) 12.8 µW/cm² = 0.128 W/m² UVA1 ( 335 nm - 380 nm) 12.8 µW/cm² = 0.128 W/m² vis. UVA ( 350 nm - 380 nm) 12.4 µW/cm² = 0.124 W/m² VIS Rep3 ( 350 nm - 600 nm) 853 µW/cm² = 8.53 W/m² VIS Rep4 ( 350 nm - 700 nm) 1130 µW/cm² = 11.3 W/m² purple ( 380 nm - 420 nm) 135 µW/cm² = 1.35 W/m² VIS ( 380 nm - 780 nm) 1130 µW/cm² = 11.3 W/m² PAR ( 400 nm - 700 nm) 1010 µW/cm² = 10.1 W/m² blue ( 420 nm - 490 nm) 227 µW/cm² = 2.27 W/m² green ( 490 nm - 575 nm) 343 µW/cm² = 3.43 W/m² yellow ( 575 nm - 585 nm) 54.4 µW/cm² = 0.544 W/m² orange ( 585 nm - 650 nm) 290 µW/cm² = 2.9 W/m² red ( 650 nm - 780 nm) 81.9 µW/cm² = 0.819 W/m² IRA ( 700 nm - 1400 nm) 16.8 µW/cm² = 0.168 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 27.2 UV-Index Pyrimidine dimerization of DNA 6.01 µW/cm² Photoceratitis 31.4 µW/cm² Photoconjunctivitis 31.2 µW/cm² DNA Damage 43.7 Vitamin D3 33.9 µW/cm² Photosynthesis 666 µW/cm² Luminosity 3420 lx Human L-Cone 520 µW/cm² Human M-Cone 410 µW/cm² Human S-Cone 186 µW/cm² CIE X 474 µW/cm² CIE Y 476 µW/cm² CIE Z 363 µW/cm² PAR 4780000 mol photons Extinction preD3 453 e-3*m²/mol Extinction Tachysterol 1370 e-3*m²/mol Exctincition PreD3 408000 m²/mol Extinction Lumisterol 482 m²/mol Exctincition Tachysterol 1720000 m²/mol Extinction 7DHC 617 m²/mol L-Cone 451 µW/cm² M-Cone 358 µW/cm² S-Cone 298 µW/cm² U-Cone 255 µW/cm² UVR - ICNIRP 2004 58.8 Rel Biol Eff Melatonin Supression 282 µW/cm² Blue Light Hazard 199 µW/cm² (58.2 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 32.5 µW/cm² Lumen Reptil 3210 "pseudo-lx" Vitamin D3 Degradation 42.9 µW/cm² Actinic UV 58.3 µW/cm² Exctincition Lumisterol 546000 m²/mol Exctincition 7DHC 668000 m²/mol Exctincition Toxisterols 46000 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 99.7 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 19 Leybold UVB 8.84 µW/cm² Leybold UVA 18.3 µW/cm² Leybold UVC 15.7 µW/cm² DeltaOhm UVB 19 µW/cm² DeltaOhm UVC 30.2 µW/cm² Vernier UVB 16.8 µW/cm² Vernier UVA 4.8 µW/cm² Gröbel UVA 10.8 µW/cm² Gröbel UVB 41.8 µW/cm² Gröbel UVC 24 µW/cm² Solarmeter 6.4 (D3) 59.5 IU/min UVX-31 21.2 µW/cm² IL UVB 0.0399 µW/cm² IL UVA 16.8 µW/cm² Solarmeter 6.5 (UVI, post 2010) 9.36 UV-Index Solarmeter 6.2 (UVB, post 2010) 29 µW/cm² (Solarmeter Ratio = 3.1) Solarmeter AlGaN 6.5 UVI sensor 44.5 UV Index GenUV 7.1 UV-Index 2.98 UV-Index Solarmeter 10.0 (Global Power) 11.9 W/m² Solarmeter 4.0 (UVA) 0.874 mW/cm²