Spectrum 591: SW21 Edit
DeleteMeasurement
| Brand |
Reptiles Expert http://www.reptilesexpert.com/ |
|---|---|
| Lamp Product |
UVB MD-Lampe 50 Watt PAR 30 |
| Lamp ID |
SW21 (01/2022) |
| Spectrometer | USB2000+ |
| Ballast | 50W EVG |
| Reflector | |
| Distance | 54.5 cm |
| Age | 90 hours |
| Originator (measurement) | Sarina Wunderlich |
Database entry created:
Sarina Wunderlich
25/Feb/2022 ; updated:
Sarina Wunderlich
25/Feb/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 | ( 0.33 ; 0.37 ) | ( 0.24 ; 0.38 ) | ( 0.27 ; 0.18 ; 0.28 ) |
| CCT | 5600 Kelvin | 11000 Kelvin | 6300 Kelvin |
| distance | 0.048 | 0.088 | |
| 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) 9370 µW/cm² = 93.7 W/m² UVC ( 0 nm - 280 nm) -91.8 µW/cm² = -0.918 W/m² non-terrestrial ( 0 nm - 290 nm) -88.4 µW/cm² = -0.884 W/m² total2 ( 250 nm - 880 nm) 9440 µW/cm² = 94.4 W/m² UVB (EU) ( 280 nm - 315 nm) 50.7 µW/cm² = 0.507 W/m² UVB (US) ( 280 nm - 320 nm) 60.4 µW/cm² = 0.604 W/m² UVA+B ( 280 nm - 380 nm) 1170 µW/cm² = 11.7 W/m² Solar UVB ( 290 nm - 315 nm) 47.4 µW/cm² = 0.474 W/m² UVA D3 regulating ( 315 nm - 335 nm) 75.6 µW/cm² = 0.756 W/m² UVA (EU) ( 315 nm - 380 nm) 1120 µW/cm² = 11.2 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 101 µW/cm² = 1.01 W/m² UVA (US) ( 320 nm - 380 nm) 1110 µW/cm² = 11.1 W/m² UVA1 (variant) ( 335 nm - 380 nm) 1040 µW/cm² = 10.4 W/m² UVA1 (medical) ( 340 nm - 400 nm) 1420 µW/cm² = 14.2 W/m² vis. UVA ( 350 nm - 380 nm) 937 µW/cm² = 9.37 W/m² VIS Rep3 ( 350 nm - 600 nm) 7280 µW/cm² = 72.8 W/m² VIS Rep4 ( 350 nm - 700 nm) 8250 µW/cm² = 82.5 W/m² purple ( 380 nm - 420 nm) 1140 µW/cm² = 11.4 W/m² VIS ( 380 nm - 780 nm) 7620 µW/cm² = 76.2 W/m² PAR ( 400 nm - 700 nm) 6900 µW/cm² = 69 W/m² blue ( 420 nm - 490 nm) 1710 µW/cm² = 17.1 W/m² green ( 490 nm - 575 nm) 2340 µW/cm² = 23.4 W/m² yellow ( 575 nm - 585 nm) 526 µW/cm² = 5.26 W/m² orange ( 585 nm - 650 nm) 1200 µW/cm² = 12 W/m² red ( 650 nm - 780 nm) 703 µW/cm² = 7.03 W/m² IRA ( 700 nm - 1400 nm) 988 µW/cm² = 9.88 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 4.7 UV-Index Pyrimidine dimerization of DNA 22.2 µW/cm² Photoceratitis 7.69 µW/cm² Photoconjunctivitis 0.877 µW/cm² DNA Damage 2.1 Vitamin D3 14.1 µW/cm² Photosynthesis 4570 µW/cm² Luminosity 22900 lx Human L-Cone 3400 µW/cm² Human M-Cone 2910 µW/cm² Human S-Cone 1540 µW/cm² CIE X 2890 µW/cm² CIE Y 3220 µW/cm² CIE Z 2670 µW/cm² PAR 32900000 mol photons Extinction preD3 86.9 e-3*m²/mol Extinction Tachysterol 313 e-3*m²/mol Exctincition PreD3 50800 m²/mol Extinction Lumisterol 38 m²/mol Exctincition Tachysterol 452000 m²/mol Extinction 7DHC 48.3 m²/mol L-Cone 2860 µW/cm² M-Cone 1910 µW/cm² S-Cone 2960 µW/cm² U-Cone 2960 µW/cm² UVR - ICNIRP 2004 5.81 Rel Biol Eff Melatonin Supression 2050 µW/cm² Blue Light Hazard 1870 µW/cm² (81.7 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 14.6 µW/cm² Lumen Reptil 23800 "pseudo-lx" Vitamin D3 Degradation 13.6 µW/cm² Actinic UV 5.76 µW/cm² (2.51 mW/klm) Exctincition Lumisterol 46800 m²/mol Exctincition 7DHC 56700 m²/mol Exctincition Toxisterols 6800 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 74.7 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 4.46 Leybold UVB 50 µW/cm² Leybold UVA 833 µW/cm² Leybold UVC 0.0345 µW/cm² DeltaOhm UVB 116 µW/cm² DeltaOhm UVC 13.8 µW/cm² Vernier UVB 19.4 µW/cm² Vernier UVA 456 µW/cm² Gröbel UVA 936 µW/cm² Gröbel UVB 30.9 µW/cm² Gröbel UVC 0.241 µW/cm² Solarmeter 6.4 (D3) 14 IU/min UVX-31 164 µW/cm² IL UVB 0.035 µW/cm² IL UVA 1030 µW/cm² Solarmeter 6.5 (UVI, post 2010) 3.09 UV-Index Solarmeter 6.2 (UVB, post 2010) 42.2 µW/cm² (Solarmeter Ratio = 13.7) Solarmeter AlGaN 6.5 UVI sensor 37.3 UV Index GenUV 7.1 UV-Index 2.2 UV-Index Solarmeter 10.0 (Global Power) 92.4 W/m² Solarmeter 4.0 (UVA) 16.2 mW/cm² LS122 0.958 W/m² ISM400 66.9 W/m²