Spectrum 416: SW-BSD1 Edit
DeleteMeasurement
| Brand |
Lucky Reptile Import Export Peter Hoch http://www.hoch-rep.com/ |
|---|---|
| Lamp Product |
Bright Sun UV Desert 50W PAR38 30° |
| Lamp ID |
SW-BSD1 (04/2011) X1-300211 |
| Spectrometer | QE65000 |
| Ballast | 50W EVG |
| Reflector | |
| Distance | 0 cm |
| Age | 2,000 hours |
| Originator (measurement) | Sarina Wunderlich |
Database entry created:
Sarina Wunderlich
28/Dec/2011 ; updated:
Sarina Wunderlich
25/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 | ( 0.34 ; 0.42 ) | ( 0.39 ; 0.45 ) | ( 0.39 ; 0.24 ; 0.27 ) |
| CCT | 5300 Kelvin | 5300 Kelvin | 3900 Kelvin |
| distance | 0.1 | 0.09 | |
| 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) 291000 µW/cm² = 2910 W/m² UVC ( 0 nm - 280 nm) 150 µW/cm² = 1.5 W/m² non-terrestrial ( 0 nm - 290 nm) 171 µW/cm² = 1.71 W/m² total2 ( 250 nm - 880 nm) 277000 µW/cm² = 2770 W/m² UVB (EU) ( 280 nm - 315 nm) 189 µW/cm² = 1.89 W/m² UVB (US) ( 280 nm - 320 nm) 234 µW/cm² = 2.34 W/m² UVA+B ( 280 nm - 380 nm) 6080 µW/cm² = 60.8 W/m² Solar UVB ( 290 nm - 315 nm) 167 µW/cm² = 1.67 W/m² UVA D3 regulating ( 315 nm - 335 nm) 367 µW/cm² = 3.67 W/m² UVA (EU) ( 315 nm - 380 nm) 5890 µW/cm² = 58.9 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 486 µW/cm² = 4.86 W/m² UVA (US) ( 320 nm - 380 nm) 5840 µW/cm² = 58.4 W/m² UVA1 (variant) ( 335 nm - 380 nm) 5520 µW/cm² = 55.2 W/m² UVA1 (medical) ( 340 nm - 400 nm) 9180 µW/cm² = 91.8 W/m² vis. UVA ( 350 nm - 380 nm) 4750 µW/cm² = 47.5 W/m² VIS Rep3 ( 350 nm - 600 nm) 188000 µW/cm² = 1880 W/m² VIS Rep4 ( 350 nm - 700 nm) 234000 µW/cm² = 2340 W/m² purple ( 380 nm - 420 nm) 16800 µW/cm² = 168 W/m² VIS ( 380 nm - 780 nm) 250000 µW/cm² = 2500 W/m² PAR ( 400 nm - 700 nm) 226000 µW/cm² = 2260 W/m² blue ( 420 nm - 490 nm) 42400 µW/cm² = 424 W/m² green ( 490 nm - 575 nm) 88700 µW/cm² = 887 W/m² yellow ( 575 nm - 585 nm) 17400 µW/cm² = 174 W/m² orange ( 585 nm - 650 nm) 42600 µW/cm² = 426 W/m² red ( 650 nm - 780 nm) 41900 µW/cm² = 419 W/m² IRA ( 700 nm - 1400 nm) 55700 µW/cm² = 557 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 52.5 UV-Index Pyrimidine dimerization of DNA 96.4 µW/cm² Photoceratitis 66.9 µW/cm² Photoconjunctivitis 93.1 µW/cm² DNA Damage 126 Vitamin D3 88.1 µW/cm² Photosynthesis 143000 µW/cm² Luminosity 839000 lx Human L-Cone 124000 µW/cm² Human M-Cone 108000 µW/cm² Human S-Cone 38500 µW/cm² CIE X 96500 µW/cm² CIE Y 119000 µW/cm² CIE Z 67700 µW/cm² PAR 1060000000 mol photons Extinction preD3 1350 e-3*m²/mol Extinction Tachysterol 2980 e-3*m²/mol Exctincition PreD3 1040000 m²/mol Extinction Lumisterol 904 m²/mol Exctincition Tachysterol 3860000 m²/mol Extinction 7DHC 993 m²/mol L-Cone 103000 µW/cm² M-Cone 62500 µW/cm² S-Cone 72200 µW/cm² U-Cone 27400 µW/cm² UVR - ICNIRP 2004 106 Rel Biol Eff Melatonin Supression 50600 µW/cm² Blue Light Hazard 46700 µW/cm² (55.7 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 90.2 µW/cm² Lumen Reptil 663000 "pseudo-lx" Vitamin D3 Degradation 85.3 µW/cm² Actinic UV 106 µW/cm² (1.26 mW/klm) Exctincition Lumisterol 871000 m²/mol Exctincition 7DHC 1000000 m²/mol Exctincition Toxisterols 561000 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 408 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 33.2 Leybold UVB 199 µW/cm² Leybold UVA 4530 µW/cm² Leybold UVC 71.3 µW/cm² DeltaOhm UVB 531 µW/cm² DeltaOhm UVC 151 µW/cm² Vernier UVB 96.9 µW/cm² Vernier UVA 2520 µW/cm² Gröbel UVA 4830 µW/cm² Gröbel UVB 154 µW/cm² Gröbel UVC 81.1 µW/cm² Solarmeter 6.4 (D3) 104 IU/min UVX-31 806 µW/cm² IL UVB 0.186 µW/cm² IL UVA 5450 µW/cm² Solarmeter 6.5 (UVI, post 2010) 22.9 UV-Index Solarmeter 6.2 (UVB, post 2010) 203 µW/cm² (Solarmeter Ratio = 8.87) Solarmeter AlGaN 6.5 UVI sensor 174 UV Index GenUV 7.1 UV-Index 13 UV-Index Solarmeter 10.0 (Global Power) 3360 W/m² Solarmeter 4.0 (UVA) 99.3 mW/cm² LS122 82.4 W/m² ISM400 2850 W/m²