Spectrum 261: BZL6 Edit
DeleteMeasurement
| Brand |
R-Zilla Zilla Products http://www.zilla-rules.com |
|---|---|
| Lamp Product |
Desert 50 T8 18W |
| Lamp ID |
BZL6 (10/2008) |
| Spectrometer | USB2000+ |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 10 cm |
| Age | 1 hours |
| Originator (measurement) | Frances Baines |
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 | ( 0.27 ; 0.25 ) | ( 0.17 ; 0.41 ) | ( 0.14 ; 0.15 ; 0.35 ) |
| CCT | 19000 Kelvin | 26000 Kelvin | 29000 Kelvin |
| distance | 0.096 | 0.082 | |
| 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) 832 µW/cm² = 8.32 W/m² UVC ( 0 nm - 280 nm) 0.943 µW/cm² = 0.00943 W/m² non-terrestrial ( 0 nm - 290 nm) 1.06 µW/cm² = 0.0106 W/m² total2 ( 250 nm - 880 nm) 832 µW/cm² = 8.32 W/m² UVB (EU) ( 280 nm - 315 nm) 76.2 µW/cm² = 0.762 W/m² UVB (US) ( 280 nm - 320 nm) 118 µW/cm² = 1.18 W/m² UVA+B ( 280 nm - 380 nm) 481 µW/cm² = 4.81 W/m² Solar UVB ( 290 nm - 315 nm) 76.1 µW/cm² = 0.761 W/m² UVA D3 regulating ( 315 nm - 335 nm) 168 µW/cm² = 1.68 W/m² UVA (EU) ( 315 nm - 380 nm) 405 µW/cm² = 4.05 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 173 µW/cm² = 1.73 W/m² UVA (US) ( 320 nm - 380 nm) 363 µW/cm² = 3.63 W/m² UVA1 (variant) ( 335 nm - 380 nm) 236 µW/cm² = 2.36 W/m² UVA1 (medical) ( 340 nm - 400 nm) 215 µW/cm² = 2.15 W/m² vis. UVA ( 350 nm - 380 nm) 114 µW/cm² = 1.14 W/m² VIS Rep3 ( 350 nm - 600 nm) 401 µW/cm² = 4.01 W/m² VIS Rep4 ( 350 nm - 700 nm) 456 µW/cm² = 4.56 W/m² purple ( 380 nm - 420 nm) 64.6 µW/cm² = 0.646 W/m² VIS ( 380 nm - 780 nm) 350 µW/cm² = 3.5 W/m² VIS2 ( 400 nm - 680 nm) 310 µW/cm² = 3.1 W/m² PAR ( 400 nm - 700 nm) 317 µW/cm² = 3.17 W/m² tmp ( 400 nm - 1100 nm) 325 µW/cm² = 3.25 W/m² blue ( 420 nm - 490 nm) 121 µW/cm² = 1.21 W/m² green ( 490 nm - 575 nm) 79.2 µW/cm² = 0.792 W/m² yellow ( 575 nm - 585 nm) 13.5 µW/cm² = 0.135 W/m² orange ( 585 nm - 650 nm) 41.7 µW/cm² = 0.417 W/m² red ( 650 nm - 780 nm) 29.6 µW/cm² = 0.296 W/m² IRA ( 700 nm - 1400 nm) 7.26 µW/cm² = 0.0726 W/m² IR2 ( 720 nm - 1100 nm) 1.89 µW/cm² = 0.0189 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 5.56 UV-Index Pyrimidine dimerization of DNA 47.1 µW/cm² Photoceratitis 8.15 µW/cm² Photoconjunctivitis 1.07 µW/cm² DNA Damage 1.51 Vitamin D3 21.9 µW/cm² Photosynthesis 235 µW/cm² Luminosity 725 lx Human L-Cone 106 µW/cm² Human M-Cone 94.5 µW/cm² Human S-Cone 109 µW/cm² CIE X 108 µW/cm² CIE Y 99.8 µW/cm² CIE Z 196 µW/cm² PAR 1550000 mol photons Extinction preD3 140 e-3*m²/mol Extinction Tachysterol 477 e-3*m²/mol Exctincition PreD3 70800 m²/mol Extinction Lumisterol 27.8 m²/mol Exctincition Tachysterol 670000 m²/mol Extinction 7DHC 26.5 m²/mol L-Cone 86.6 µW/cm² M-Cone 89.9 µW/cm² S-Cone 211 µW/cm² U-Cone 219 µW/cm² UVR - ICNIRP 2004 4.79 Rel Biol Eff Melatonin Supression 133 µW/cm² Blue Light Hazard 129 µW/cm² (178 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 24.2 µW/cm² Lumen Reptil 1190 "pseudo-lx" Vitamin D3 Degradation 23 µW/cm² Actinic UV 4.74 µW/cm² (65.5 mW/klm) Exctincition Lumisterol 36400 m²/mol Exctincition 7DHC 32500 m²/mol Exctincition Toxisterols 17600 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 139 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 6.25 Leybold UVB 101 µW/cm² Leybold UVA 260 µW/cm² Leybold UVC 0.957 µW/cm² DeltaOhm UVB 225 µW/cm² DeltaOhm UVC 29.2 µW/cm² Vernier UVB 37.1 µW/cm² Vernier UVA 295 µW/cm² Gröbel UVA 340 µW/cm² Gröbel UVB 52.7 µW/cm² Gröbel UVC 0.813 µW/cm² Luxmeter 753 lx Solarmeter 6.4 (D3) 19.5 IU/min UVX-31 246 µW/cm² IL UVB 0.0587 µW/cm² IL UVA 293 µW/cm² Solarmeter 6.5 (UVI, post 2010) 5.12 UV-Index Solarmeter 6.2 (UVB, post 2010) 90.8 µW/cm² (Solarmeter Ratio = 17.7) Solarmeter AlGaN 6.5 UVI sensor 64.6 UV Index GenUV 7.1 UV-Index 3.59 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 5.14 W/m² Solarmeter 4.0 (UVA) 3.86 mW/cm² LS122 (manuf.) 0.000176 W/m² ISM400 (first guess) 2.16 W/m² LS122 (assumption) 0.0879 W/m² ISM400_new 1.63 W/m² Solarmeter 10.0 (Global Power) (assumption) 3.72 W/m²