Spectrum 602: SW30 Edit
DeleteMeasurement
| Brand |
Hobby (Dohse) Dohse Aquaristik KG http://www.dohse-aquaristik.com/ |
|---|---|
| Lamp Product |
UV Vital LED |
| Lamp ID |
SW30 (06/2022) |
| Spectrometer | USB2000+ |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 10 cm |
| Age | 10 hours |
| Originator (measurement) | Sarina Wunderlich |
Database entry created:
Sarina Wunderlich
25/Jul/2022 ; updated:
Sarina Wunderlich
25/Sep/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 | ( 0.29 ; 0.28 ) | ( 0.089 ; 0.3 ) | ( 0.09 ; 0.081 ; 0.27 ) |
| CCT | 9900 Kelvin | 0 Kelvin | 0 Kelvin |
| distance | 0 | 0 | |
| 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) 1820 µW/cm² = 18.2 W/m² UVC ( 0 nm - 280 nm) 1.42 µW/cm² = 0.0142 W/m² non-terrestrial ( 0 nm - 290 nm) 31 µW/cm² = 0.31 W/m² total2 ( 250 nm - 880 nm) 1820 µW/cm² = 18.2 W/m² UVB (EU) ( 280 nm - 315 nm) 241 µW/cm² = 2.41 W/m² UVB (US) ( 280 nm - 320 nm) 244 µW/cm² = 2.44 W/m² UVA+B ( 280 nm - 380 nm) 257 µW/cm² = 2.57 W/m² Solar UVB ( 290 nm - 315 nm) 211 µW/cm² = 2.11 W/m² UVA D3 regulating ( 315 nm - 335 nm) 7.55 µW/cm² = 0.0755 W/m² UVA (EU) ( 315 nm - 380 nm) 16.6 µW/cm² = 0.166 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 4.71 µW/cm² = 0.0471 W/m² UVA (US) ( 320 nm - 380 nm) 13.2 µW/cm² = 0.132 W/m² UVA1 (variant) ( 335 nm - 380 nm) 9.07 µW/cm² = 0.0907 W/m² UVA1 (medical) ( 340 nm - 400 nm) 431 µW/cm² = 4.31 W/m² vis. UVA ( 350 nm - 380 nm) 7.77 µW/cm² = 0.0777 W/m² VIS Rep3 ( 350 nm - 600 nm) 1450 µW/cm² = 14.5 W/m² VIS Rep4 ( 350 nm - 700 nm) 1560 µW/cm² = 15.6 W/m² purple ( 380 nm - 420 nm) 994 µW/cm² = 9.94 W/m² VIS ( 380 nm - 780 nm) 1560 µW/cm² = 15.6 W/m² VIS2 ( 400 nm - 680 nm) 1120 µW/cm² = 11.2 W/m² PAR ( 400 nm - 700 nm) 1130 µW/cm² = 11.3 W/m² tmp ( 400 nm - 1100 nm) 1140 µW/cm² = 11.4 W/m² blue ( 420 nm - 490 nm) 190 µW/cm² = 1.9 W/m² green ( 490 nm - 575 nm) 199 µW/cm² = 1.99 W/m² yellow ( 575 nm - 585 nm) 27 µW/cm² = 0.27 W/m² orange ( 585 nm - 650 nm) 111 µW/cm² = 1.11 W/m² red ( 650 nm - 780 nm) 37 µW/cm² = 0.37 W/m² IRA ( 700 nm - 1400 nm) 16.7 µW/cm² = 0.167 W/m² IR2 ( 720 nm - 1100 nm) 12.2 µW/cm² = 0.122 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 76.6 UV-Index Pyrimidine dimerization of DNA 122 µW/cm² Photoceratitis 119 µW/cm² Photoconjunctivitis 9.92 µW/cm² DNA Damage 29.2 Vitamin D3 205 µW/cm² Photosynthesis 759 µW/cm² Luminosity 1850 lx Human L-Cone 274 µW/cm² Human M-Cone 236 µW/cm² Human S-Cone 264 µW/cm² CIE X 266 µW/cm² CIE Y 255 µW/cm² CIE Z 404 µW/cm² PAR 6860000 mol photons Extinction preD3 786 e-3*m²/mol Extinction Tachysterol 3110 e-3*m²/mol Exctincition PreD3 498000 m²/mol Extinction Lumisterol 646 m²/mol Exctincition Tachysterol 4000000 m²/mol Extinction 7DHC 895 m²/mol L-Cone 224 µW/cm² M-Cone 200 µW/cm² S-Cone 668 µW/cm² U-Cone 1390 µW/cm² UVR - ICNIRP 2004 103 Rel Biol Eff Melatonin Supression 450 µW/cm² Blue Light Hazard 365 µW/cm² (197 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 209 µW/cm² Lumen Reptil 4970 "pseudo-lx" Vitamin D3 Degradation 94 µW/cm² Actinic UV 102 µW/cm² (549 mW/klm) Exctincition Lumisterol 753000 m²/mol Exctincition 7DHC 1040000 m²/mol Exctincition Toxisterols 34500 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 329 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 63.2 Leybold UVB 194 µW/cm² Leybold UVA 43.9 µW/cm² Leybold UVC 0.917 µW/cm² DeltaOhm UVB 185 µW/cm² DeltaOhm UVC 54.7 µW/cm² Vernier UVB 165 µW/cm² Vernier UVA 17.5 µW/cm² Gröbel UVA 18.7 µW/cm² Gröbel UVB 225 µW/cm² Gröbel UVC 1.59 µW/cm² Luxmeter 1930 lx Solarmeter 6.4 (D3) 197 IU/min UVX-31 190 µW/cm² IL UVB 0.165 µW/cm² IL UVA 26.8 µW/cm² Solarmeter 6.5 (UVI, post 2010) 37.2 UV-Index Solarmeter 6.2 (UVB, post 2010) 126 µW/cm² (Solarmeter Ratio = 3.39) Solarmeter AlGaN 6.5 UVI sensor 215 UV Index GenUV 7.1 UV-Index 10.9 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 12.3 W/m² Solarmeter 4.0 (UVA) 3.43 mW/cm² LS122 (manuf.) 0.0167 W/m² ISM400 (first guess) 5.53 W/m² LS122 (assumption) 0.211 W/m² ISM400_new 4.07 W/m² Solarmeter 10.0 (Global Power) (assumption) 9.43 W/m²