UG11, neg. Values = 0
Spectrum 67: BP6 Edit
DeleteMeasurement
| Brand |
Zoo Med Zoo Med Laboratories, Inc http://www.zoomed.com/ |
|---|---|
| Lamp Product |
PowerSun UV 100W |
| Lamp ID |
BP6 (11/2007) |
| Spectrometer | USB 2000 |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 30 cm |
| Age | 105 hours |
| Originator (measurement) | Frances Baines |
Database entry created:
Sarina Wunderlich
4/Mar/2010 ; updated:
Sarina Wunderlich
9/Oct/2011
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 270.05 - 750.92 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 | ( 0.38 ; 0.4 ) | ( 0.22 ; 0.42 ) | ( 0.39 ; 0.13 ; 0.26 ) |
| CCT | 4100 Kelvin | 12000 Kelvin | 3900 Kelvin |
| distance | 0.097 | 0.17 | |
| 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) 1090 µW/cm² = 10.9 W/m² UVC ( 0 nm - 280 nm) 0.0513 µW/cm² = 0.000513 W/m² non-terrestrial ( 0 nm - 290 nm) 0.108 µW/cm² = 0.00108 W/m² total2 ( 250 nm - 880 nm) 1090 µW/cm² = 10.9 W/m² UVB (EU) ( 280 nm - 315 nm) 14.2 µW/cm² = 0.142 W/m² UVB (US) ( 280 nm - 320 nm) 14.8 µW/cm² = 0.148 W/m² UVA+B ( 280 nm - 380 nm) 96.8 µW/cm² = 0.968 W/m² Solar UVB ( 290 nm - 315 nm) 14.1 µW/cm² = 0.141 W/m² UVA D3 regulating ( 315 nm - 335 nm) 5.7 µW/cm² = 0.057 W/m² UVA (EU) ( 315 nm - 380 nm) 82.6 µW/cm² = 0.826 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 6.25 µW/cm² = 0.0625 W/m² UVA (US) ( 320 nm - 380 nm) 81.9 µW/cm² = 0.819 W/m² UVA1 (variant) ( 335 nm - 380 nm) 76.9 µW/cm² = 0.769 W/m² UVA1 (medical) ( 340 nm - 400 nm) 81.7 µW/cm² = 0.817 W/m² vis. UVA ( 350 nm - 380 nm) 74.1 µW/cm² = 0.741 W/m² VIS Rep3 ( 350 nm - 600 nm) 629 µW/cm² = 6.29 W/m² VIS Rep4 ( 350 nm - 700 nm) 879 µW/cm² = 8.79 W/m² purple ( 380 nm - 420 nm) 59.5 µW/cm² = 0.595 W/m² VIS ( 380 nm - 780 nm) 996 µW/cm² = 9.96 W/m² PAR ( 400 nm - 700 nm) 799 µW/cm² = 7.99 W/m² blue ( 420 nm - 490 nm) 122 µW/cm² = 1.22 W/m² green ( 490 nm - 575 nm) 198 µW/cm² = 1.98 W/m² yellow ( 575 nm - 585 nm) 151 µW/cm² = 1.51 W/m² orange ( 585 nm - 650 nm) 128 µW/cm² = 1.28 W/m² red ( 650 nm - 780 nm) 337 µW/cm² = 3.37 W/m² IRA ( 700 nm - 1400 nm) 191 µW/cm² = 1.91 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 0.756 UV-Index Pyrimidine dimerization of DNA 5.8 µW/cm² Photoceratitis 1.32 µW/cm² Photoconjunctivitis 0.0606 µW/cm² DNA Damage 0.144 Vitamin D3 3.15 µW/cm² Photosynthesis 535 µW/cm² Luminosity 2640 lx Human L-Cone 401 µW/cm² Human M-Cone 316 µW/cm² Human S-Cone 115 µW/cm² CIE X 357 µW/cm² CIE Y 373 µW/cm² CIE Z 205 µW/cm² PAR 4090000 mol photons Extinction preD3 17.5 e-3*m²/mol Extinction Tachysterol 59.2 e-3*m²/mol Exctincition PreD3 8270 m²/mol Extinction Lumisterol 3.99 m²/mol Exctincition Tachysterol 77200 m²/mol Extinction 7DHC 4.05 m²/mol L-Cone 359 µW/cm² M-Cone 122 µW/cm² S-Cone 233 µW/cm² U-Cone 196 µW/cm² UVR - ICNIRP 2004 0.729 Rel Biol Eff Melatonin Supression 140 µW/cm² Blue Light Hazard 133 µW/cm² (50.5 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 3.26 µW/cm² Lumen Reptil 2170 "pseudo-lx" Vitamin D3 Degradation 2.83 µW/cm² Actinic UV 0.704 µW/cm² (2.66 mW/klm) Exctincition Lumisterol 5280 m²/mol Exctincition 7DHC 5210 m²/mol Exctincition Toxisterols 1030 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 15.5 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 0.855 Leybold UVB 12.6 µW/cm² Leybold UVA 58.4 µW/cm² Leybold UVC 0.0193 µW/cm² DeltaOhm UVB 16.8 µW/cm² DeltaOhm UVC 2.45 µW/cm² Vernier UVB 4.87 µW/cm² Vernier UVA 28.1 µW/cm² Gröbel UVA 73.1 µW/cm² Gröbel UVB 7.26 µW/cm² Gröbel UVC 0.0256 µW/cm² Solarmeter 6.4 (D3) 2.67 IU/min UVX-31 20.8 µW/cm² IL UVB 0.00633 µW/cm² IL UVA 76.8 µW/cm² Solarmeter 6.5 (UVI, post 2010) 0.686 UV-Index Solarmeter 6.2 (UVB, post 2010) 8.54 µW/cm² (Solarmeter Ratio = 12.4) Solarmeter AlGaN 6.5 UVI sensor 10.2 UV Index GenUV 7.1 UV-Index 0.512 UV-Index Solarmeter 10.0 (Global Power) 12.2 W/m² Solarmeter 4.0 (UVA) 1.08 mW/cm² LS122 0 W/m² ISM400 9.92 W/m²