Spectrum 712: SW79 Edit
DeleteMeasurement
| Brand |
Chinese manufacturer |
|---|---|
| Lamp Product |
REPTILE UVB 3W 3-LED UV emitting LED spot with E27. It is labelled „REPTILE UVB 3W“ on the lamp socket and the otherwise neutral box. It contains 2 golden UVB LEDs, 1 yellow standard LEDs for white light and 2 white UVA LEDs. |
| Lamp ID |
SW79 (06/2023) |
| Spectrometer | USB2000+ |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 10 cm |
| Age | 1 hours |
| Originator (measurement) | Sarina Wunderlich |
Database entry created:
Sarina Wunderlich
2/Jul/2023 ; updated:
Sarina Wunderlich
2/Jul/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 | ( 0.32 ; 0.32 ) | ( 0.21 ; 0.29 ) | ( 0.17 ; 0.18 ; 0.24 ) |
| CCT | 6300 Kelvin | 35000 Kelvin | 12000 Kelvin |
| distance | 0.029 | 0.062 | |
| 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) 2170 µW/cm² = 21.7 W/m² UVC ( 0 nm - 280 nm) 1.35 µW/cm² = 0.0135 W/m² non-terrestrial ( 0 nm - 290 nm) 3.34 µW/cm² = 0.0334 W/m² total2 ( 250 nm - 880 nm) 2170 µW/cm² = 21.7 W/m² UVB (EU) ( 280 nm - 315 nm) 227 µW/cm² = 2.27 W/m² UVB (US) ( 280 nm - 320 nm) 253 µW/cm² = 2.53 W/m² UVA+B ( 280 nm - 380 nm) 281 µW/cm² = 2.81 W/m² Solar UVB ( 290 nm - 315 nm) 225 µW/cm² = 2.25 W/m² UVA D3 regulating ( 315 nm - 335 nm) 42.2 µW/cm² = 0.422 W/m² UVA (EU) ( 315 nm - 380 nm) 54 µW/cm² = 0.54 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 17.7 µW/cm² = 0.177 W/m² UVA (US) ( 320 nm - 380 nm) 28.4 µW/cm² = 0.284 W/m² UVA1 (variant) ( 335 nm - 380 nm) 11.8 µW/cm² = 0.118 W/m² UVA1 (medical) ( 340 nm - 400 nm) 451 µW/cm² = 4.51 W/m² vis. UVA ( 350 nm - 380 nm) 9.29 µW/cm² = 0.0929 W/m² VIS Rep3 ( 350 nm - 600 nm) 1600 µW/cm² = 16 W/m² VIS Rep4 ( 350 nm - 700 nm) 1870 µW/cm² = 18.7 W/m² purple ( 380 nm - 420 nm) 709 µW/cm² = 7.09 W/m² VIS ( 380 nm - 780 nm) 1880 µW/cm² = 18.8 W/m² PAR ( 400 nm - 700 nm) 1420 µW/cm² = 14.2 W/m² blue ( 420 nm - 490 nm) 347 µW/cm² = 3.47 W/m² green ( 490 nm - 575 nm) 399 µW/cm² = 3.99 W/m² yellow ( 575 nm - 585 nm) 53.8 µW/cm² = 0.538 W/m² orange ( 585 nm - 650 nm) 280 µW/cm² = 2.8 W/m² red ( 650 nm - 780 nm) 92.5 µW/cm² = 0.925 W/m² IRA ( 700 nm - 1400 nm) 24 µW/cm² = 0.24 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 25.6 UV-Index Pyrimidine dimerization of DNA 157 µW/cm² Photoceratitis 37.6 µW/cm² Photoconjunctivitis 2.09 µW/cm² DNA Damage 5.13 Vitamin D3 105 µW/cm² Photosynthesis 960 µW/cm² Luminosity 3720 lx Human L-Cone 556 µW/cm² Human M-Cone 464 µW/cm² Human S-Cone 324 µW/cm² CIE X 513 µW/cm² CIE Y 515 µW/cm² CIE Z 590 µW/cm² PAR 7230000 mol photons Extinction preD3 421 e-3*m²/mol Extinction Tachysterol 1420 e-3*m²/mol Exctincition PreD3 202000 m²/mol Extinction Lumisterol 151 m²/mol Exctincition Tachysterol 1790000 m²/mol Extinction 7DHC 156 m²/mol L-Cone 468 µW/cm² M-Cone 475 µW/cm² S-Cone 638 µW/cm² U-Cone 1120 µW/cm² UVR - ICNIRP 2004 26 Rel Biol Eff Melatonin Supression 509 µW/cm² Blue Light Hazard 385 µW/cm² (103 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 118 µW/cm² Lumen Reptil 5670 "pseudo-lx" Vitamin D3 Degradation 61 µW/cm² Actinic UV 25.6 µW/cm² (68.7 mW/klm) Exctincition Lumisterol 188000 m²/mol Exctincition 7DHC 191000 m²/mol Exctincition Toxisterols 20300 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 279 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 30 Leybold UVB 227 µW/cm² Leybold UVA 52.6 µW/cm² Leybold UVC 0.508 µW/cm² DeltaOhm UVB 224 µW/cm² DeltaOhm UVC 43.4 µW/cm² Vernier UVB 146 µW/cm² Vernier UVA 77.7 µW/cm² Gröbel UVA 60.9 µW/cm² Gröbel UVB 164 µW/cm² Gröbel UVC 0.761 µW/cm² Solarmeter 6.4 (D3) 93.7 IU/min UVX-31 255 µW/cm² IL UVB 0.122 µW/cm² IL UVA 46.8 µW/cm² Solarmeter 6.5 (UVI, post 2010) 22.5 UV-Index Solarmeter 6.2 (UVB, post 2010) 141 µW/cm² (Solarmeter Ratio = 6.25) Solarmeter AlGaN 6.5 UVI sensor 206 UV Index GenUV 7.1 UV-Index 9.84 UV-Index Solarmeter 10.0 (Global Power) 17.3 W/m² Solarmeter 4.0 (UVA) 3.55 mW/cm² LS122 0.00465 W/m² ISM400 9.71 W/m²