Spectrum 467: BAS13 Edit
DeleteMeasurement
| Brand |
Arcadia UK company https://www.arcadiareptile.com/ |
|---|---|
| Lamp Product |
D3 UV Basking Lamp 160W |
| Lamp ID |
BAS13 (03/2010) 160 watt Arcadia D3 Basking Lamp |
| Spectrometer | USB2000+ (2) |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 30 cm |
| Age | 105 hours |
| Originator (measurement) | Frances Baines |
Database entry created:
Frances Baines
12/Feb/2012 ; updated:
Frances Baines
12/Feb/2012
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.
WARNING: The measurement range (350 - 800 nm) is not sufficient for this evaluation! Data is only available in the range 250.23 - 750.24 nm. Results are shown anyway but should be ignored by anyone except experts.
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 ; 0.35 ) | ( 0.14 ; 0.39 ) | ( 0.26 ; 0.1 ; 0.29 ) |
| CCT | 5200 Kelvin | 0 Kelvin | 8400 Kelvin |
| distance | 0 | 0.15 | |
| 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) 3020 µW/cm² = 30.2 W/m² UVC ( 0 nm - 280 nm) 0.532 µW/cm² = 0.00532 W/m² non-terrestrial ( 0 nm - 290 nm) 1.46 µW/cm² = 0.0146 W/m² total2 ( 250 nm - 880 nm) 3020 µW/cm² = 30.2 W/m² UVB (EU) ( 280 nm - 315 nm) 82.9 µW/cm² = 0.829 W/m² UVB (US) ( 280 nm - 320 nm) 94.8 µW/cm² = 0.948 W/m² UVA+B ( 280 nm - 380 nm) 698 µW/cm² = 6.98 W/m² Solar UVB ( 290 nm - 315 nm) 82 µW/cm² = 0.82 W/m² UVA D3 regulating ( 315 nm - 335 nm) 55.1 µW/cm² = 0.551 W/m² UVA (EU) ( 315 nm - 380 nm) 615 µW/cm² = 6.15 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 62.6 µW/cm² = 0.626 W/m² UVA (US) ( 320 nm - 380 nm) 603 µW/cm² = 6.03 W/m² UVA1 (variant) ( 335 nm - 380 nm) 560 µW/cm² = 5.6 W/m² UVA1 (medical) ( 340 nm - 400 nm) 571 µW/cm² = 5.71 W/m² vis. UVA ( 350 nm - 380 nm) 517 µW/cm² = 5.17 W/m² VIS Rep3 ( 350 nm - 600 nm) 2180 µW/cm² = 21.8 W/m² VIS Rep4 ( 350 nm - 700 nm) 2610 µW/cm² = 26.1 W/m² purple ( 380 nm - 420 nm) 250 µW/cm² = 2.5 W/m² VIS ( 380 nm - 780 nm) 2320 µW/cm² = 23.2 W/m² PAR ( 400 nm - 700 nm) 2060 µW/cm² = 20.6 W/m² blue ( 420 nm - 490 nm) 482 µW/cm² = 4.82 W/m² green ( 490 nm - 575 nm) 545 µW/cm² = 5.45 W/m² yellow ( 575 nm - 585 nm) 332 µW/cm² = 3.32 W/m² orange ( 585 nm - 650 nm) 280 µW/cm² = 2.8 W/m² red ( 650 nm - 780 nm) 431 µW/cm² = 4.31 W/m² IRA ( 700 nm - 1400 nm) 229 µW/cm² = 2.29 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 5.94 UV-Index Pyrimidine dimerization of DNA 36.5 µW/cm² Photoceratitis 9.29 µW/cm² Photoconjunctivitis 0.734 µW/cm² DNA Damage 1.54 Vitamin D3 21.5 µW/cm² Photosynthesis 1390 µW/cm² Luminosity 6650 lx Human L-Cone 998 µW/cm² Human M-Cone 820 µW/cm² Human S-Cone 467 µW/cm² CIE X 906 µW/cm² CIE Y 938 µW/cm² CIE Z 819 µW/cm² PAR 10500000 mol photons Extinction preD3 118 e-3*m²/mol Extinction Tachysterol 411 e-3*m²/mol Exctincition PreD3 60200 m²/mol Extinction Lumisterol 35.3 m²/mol Exctincition Tachysterol 542000 m²/mol Extinction 7DHC 40 m²/mol L-Cone 866 µW/cm² M-Cone 340 µW/cm² S-Cone 950 µW/cm² U-Cone 1170 µW/cm² UVR - ICNIRP 2004 6.11 Rel Biol Eff Melatonin Supression 536 µW/cm² Blue Light Hazard 538 µW/cm² (80.9 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 22.6 µW/cm² Lumen Reptil 7020 "pseudo-lx" Vitamin D3 Degradation 18.8 µW/cm² Actinic UV 5.99 µW/cm² (9.01 mW/klm) Exctincition Lumisterol 44900 m²/mol Exctincition 7DHC 48700 m²/mol Exctincition Toxisterols 8470 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 103 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 6.17 Leybold UVB 78 µW/cm² Leybold UVA 417 µW/cm² Leybold UVC 0.308 µW/cm² DeltaOhm UVB 123 µW/cm² DeltaOhm UVC 17.3 µW/cm² Vernier UVB 30.7 µW/cm² Vernier UVA 262 µW/cm² Gröbel UVA 526 µW/cm² Gröbel UVB 45.9 µW/cm² Gröbel UVC 0.35 µW/cm² Solarmeter 6.4 (D3) 19.3 IU/min UVX-31 148 µW/cm² IL UVB 0.0424 µW/cm² IL UVA 553 µW/cm² Solarmeter 6.5 (UVI, post 2010) 4.64 UV-Index Solarmeter 6.2 (UVB, post 2010) 57.7 µW/cm² (Solarmeter Ratio = 12.4) Solarmeter AlGaN 6.5 UVI sensor 58 UV Index GenUV 7.1 UV-Index 3.12 UV-Index Solarmeter 10.0 (Global Power) 27.7 W/m² Solarmeter 4.0 (UVA) 7.49 mW/cm² LS122 0 W/m² ISM400 18.6 W/m²