Spectrum 586: SW14 Edit
DeleteMeasurement
| Brand |
Reptile Systems French brand, originally for aqaristics https://www.aquariumsystems.fr/ |
|---|---|
| Lamp Product |
New Dawn UVI Flood 13W 60-LED UV-emitting LED bar. Specifications: 30 x UVB LED, 2 x UVA LED, 28 x 6500K LED, 13 watts, 120-deg beam angle. 20cm: UVI 5.1; 20-30cm: UVI 3.3 - 5.1; 30-50cm: UVI 3.3 - 1.3; 50-80cm: UVI 0.5 - 1.3 |
| Lamp ID |
SW14 (10/2021) |
| Spectrometer | USB2000+ |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 20 cm |
| Age | 70 hours |
| Originator (measurement) | Sarina Wunderlich |
Database entry created:
Sarina Wunderlich
30/Oct/2021 ; updated:
Sarina Wunderlich
30/Oct/2021
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 | ( 0.31 ; 0.32 ) | ( 0.4 ; 0.52 ) | ( 0.31 ; 0.28 ; 0.36 ) |
| CCT | 6500 Kelvin | 5100 Kelvin | 4800 Kelvin |
| distance | 0.18 | 0.13 | |
| 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) 1190 µW/cm² = 11.9 W/m² UVC ( 0 nm - 280 nm) 5.68 µW/cm² = 0.0568 W/m² non-terrestrial ( 0 nm - 290 nm) 6.19 µW/cm² = 0.0619 W/m² total2 ( 250 nm - 880 nm) 1190 µW/cm² = 11.9 W/m² UVB (EU) ( 280 nm - 315 nm) 21.8 µW/cm² = 0.218 W/m² UVB (US) ( 280 nm - 320 nm) 25.3 µW/cm² = 0.253 W/m² UVA+B ( 280 nm - 380 nm) 30.9 µW/cm² = 0.309 W/m² Solar UVB ( 290 nm - 315 nm) 21.3 µW/cm² = 0.213 W/m² UVA D3 regulating ( 315 nm - 335 nm) 7.07 µW/cm² = 0.0707 W/m² UVA (EU) ( 315 nm - 380 nm) 9.13 µW/cm² = 0.0913 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 4.02 µW/cm² = 0.0402 W/m² UVA (US) ( 320 nm - 380 nm) 5.63 µW/cm² = 0.0563 W/m² UVA1 (variant) ( 335 nm - 380 nm) 2.06 µW/cm² = 0.0206 W/m² UVA1 (medical) ( 340 nm - 400 nm) 18 µW/cm² = 0.18 W/m² vis. UVA ( 350 nm - 380 nm) 1.01 µW/cm² = 0.0101 W/m² VIS Rep3 ( 350 nm - 600 nm) 910 µW/cm² = 9.1 W/m² VIS Rep4 ( 350 nm - 700 nm) 1140 µW/cm² = 11.4 W/m² purple ( 380 nm - 420 nm) 45.8 µW/cm² = 0.458 W/m² VIS ( 380 nm - 780 nm) 1150 µW/cm² = 11.5 W/m² PAR ( 400 nm - 700 nm) 1120 µW/cm² = 11.2 W/m² blue ( 420 nm - 490 nm) 342 µW/cm² = 3.42 W/m² green ( 490 nm - 575 nm) 397 µW/cm² = 3.97 W/m² yellow ( 575 nm - 585 nm) 51.5 µW/cm² = 0.515 W/m² orange ( 585 nm - 650 nm) 246 µW/cm² = 2.46 W/m² red ( 650 nm - 780 nm) 72 µW/cm² = 0.72 W/m² IRA ( 700 nm - 1400 nm) 17.4 µW/cm² = 0.174 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 2.56 UV-Index Pyrimidine dimerization of DNA 14.4 µW/cm² Photoceratitis 3.85 µW/cm² Photoconjunctivitis 0.257 µW/cm² DNA Damage 0.657 Vitamin D3 9.91 µW/cm² Photosynthesis 768 µW/cm² Luminosity 3550 lx Human L-Cone 528 µW/cm² Human M-Cone 447 µW/cm² Human S-Cone 304 µW/cm² CIE X 484 µW/cm² CIE Y 494 µW/cm² CIE Z 566 µW/cm² PAR 5090000 mol photons Extinction preD3 42 e-3*m²/mol Extinction Tachysterol 144 e-3*m²/mol Exctincition PreD3 20900 m²/mol Extinction Lumisterol 16.7 m²/mol Exctincition Tachysterol 183000 m²/mol Extinction 7DHC 18.7 m²/mol L-Cone 442 µW/cm² M-Cone 404 µW/cm² S-Cone 524 µW/cm² U-Cone 71.8 µW/cm² UVR - ICNIRP 2004 2.76 Rel Biol Eff Melatonin Supression 386 µW/cm² Blue Light Hazard 323 µW/cm² (91 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 11 µW/cm² Lumen Reptil 3380 "pseudo-lx" Vitamin D3 Degradation 6.08 µW/cm² Actinic UV 2.73 µW/cm² (7.67 mW/klm) Exctincition Lumisterol 20600 m²/mol Exctincition 7DHC 22600 m²/mol Exctincition Toxisterols 2070 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 28.1 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 2.87 Leybold UVB 22 µW/cm² Leybold UVA 4.26 µW/cm² Leybold UVC 0.0277 µW/cm² DeltaOhm UVB 24.3 µW/cm² DeltaOhm UVC 4.56 µW/cm² Vernier UVB 13.5 µW/cm² Vernier UVA 10.6 µW/cm² Gröbel UVA 8.57 µW/cm² Gröbel UVB 15.8 µW/cm² Gröbel UVC 0.0687 µW/cm² Solarmeter 6.4 (D3) 8.97 IU/min UVX-31 26.9 µW/cm² IL UVB 0.0122 µW/cm² IL UVA 5.44 µW/cm² Solarmeter 6.5 (UVI, post 2010) 2.11 UV-Index Solarmeter 6.2 (UVB, post 2010) 14.5 µW/cm² (Solarmeter Ratio = 6.9) Solarmeter AlGaN 6.5 UVI sensor 19.5 UV Index GenUV 7.1 UV-Index 0.949 UV-Index Solarmeter 10.0 (Global Power) 11.9 W/m² Solarmeter 4.0 (UVA) 0.203 mW/cm² LS122 0.00193 W/m² ISM400 7.86 W/m²