Spectrum 224: BSY7 Edit
DeleteMeasurement
| Brand |
Sylvania Sylvania http://www.sylvania-lamps.com/ |
|---|---|
| Lamp Product |
Gro-Lux T8 |
| Lamp ID |
BSY7 (07/2009) |
| Spectrometer | USB2000+ (2) |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 10 cm |
| Age | 1 hours |
| Originator (measurement) | Frances Baines |
Database entry created:
Maren
10/Jun/2010 ; updated:
Sarina Wunderlich
27/Feb/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.
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 | ( 0.31 ; 0.22 ) | ( 0.31 ; 0.52 ) | ( 0.21 ; 0.24 ; 0.41 ) |
| CCT | 12000 Kelvin | 7000 Kelvin | 7300 Kelvin |
| distance | 0.18 | 0.14 | |
| 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) 746 µW/cm² = 7.46 W/m² UVC ( 0 nm - 280 nm) 0.458 µW/cm² = 0.00458 W/m² non-terrestrial ( 0 nm - 290 nm) 0.587 µW/cm² = 0.00587 W/m² total2 ( 250 nm - 880 nm) 746 µW/cm² = 7.46 W/m² UVB (EU) ( 280 nm - 315 nm) 2.71 µW/cm² = 0.0271 W/m² UVB (US) ( 280 nm - 320 nm) 2.97 µW/cm² = 0.0297 W/m² UVA+B ( 280 nm - 380 nm) 30.4 µW/cm² = 0.304 W/m² Solar UVB ( 290 nm - 315 nm) 2.58 µW/cm² = 0.0258 W/m² UVA D3 regulating ( 315 nm - 335 nm) 1.95 µW/cm² = 0.0195 W/m² UVA (EU) ( 315 nm - 380 nm) 27.7 µW/cm² = 0.277 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 2.68 µW/cm² = 0.0268 W/m² UVA (US) ( 320 nm - 380 nm) 27.4 µW/cm² = 0.274 W/m² UVA1 (variant) ( 335 nm - 380 nm) 25.7 µW/cm² = 0.257 W/m² UVA1 (medical) ( 340 nm - 400 nm) 37.9 µW/cm² = 0.379 W/m² vis. UVA ( 350 nm - 380 nm) 22.5 µW/cm² = 0.225 W/m² VIS Rep3 ( 350 nm - 600 nm) 451 µW/cm² = 4.51 W/m² VIS Rep4 ( 350 nm - 700 nm) 725 µW/cm² = 7.25 W/m² purple ( 380 nm - 420 nm) 59.8 µW/cm² = 0.598 W/m² VIS ( 380 nm - 780 nm) 711 µW/cm² = 7.11 W/m² PAR ( 400 nm - 700 nm) 689 µW/cm² = 6.89 W/m² blue ( 420 nm - 490 nm) 227 µW/cm² = 2.27 W/m² green ( 490 nm - 575 nm) 118 µW/cm² = 1.18 W/m² yellow ( 575 nm - 585 nm) 11.2 µW/cm² = 0.112 W/m² orange ( 585 nm - 650 nm) 144 µW/cm² = 1.44 W/m² red ( 650 nm - 780 nm) 151 µW/cm² = 1.51 W/m² IRA ( 700 nm - 1400 nm) 12.8 µW/cm² = 0.128 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 0.368 UV-Index Pyrimidine dimerization of DNA 1 µW/cm² Photoceratitis 0.444 µW/cm² Photoconjunctivitis 0.417 µW/cm² DNA Damage 0.496 Vitamin D3 0.654 µW/cm² Photosynthesis 531 µW/cm² Luminosity 1240 lx Human L-Cone 191 µW/cm² Human M-Cone 144 µW/cm² Human S-Cone 190 µW/cm² CIE X 227 µW/cm² CIE Y 167 µW/cm² CIE Z 349 µW/cm² PAR 3330000 mol photons Extinction preD3 7.52 e-3*m²/mol Extinction Tachysterol 20.1 e-3*m²/mol Exctincition PreD3 5770 m²/mol Extinction Lumisterol 4.45 m²/mol Exctincition Tachysterol 26400 m²/mol Extinction 7DHC 5.22 m²/mol L-Cone 171 µW/cm² M-Cone 198 µW/cm² S-Cone 334 µW/cm² U-Cone 115 µW/cm² UVR - ICNIRP 2004 0.553 Rel Biol Eff Melatonin Supression 247 µW/cm² Blue Light Hazard 213 µW/cm² (171 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 0.666 µW/cm² Lumen Reptil 1800 "pseudo-lx" Vitamin D3 Degradation 0.714 µW/cm² Actinic UV 0.549 µW/cm² (4.42 mW/klm) Exctincition Lumisterol 4920 m²/mol Exctincition 7DHC 5570 m²/mol Exctincition Toxisterols 2310 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 3.76 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 0.222 Leybold UVB 2.37 µW/cm² Leybold UVA 20.8 µW/cm² Leybold UVC 0.346 µW/cm² DeltaOhm UVB 4.31 µW/cm² DeltaOhm UVC 0.917 µW/cm² Vernier UVB 0.912 µW/cm² Vernier UVA 12.1 µW/cm² Gröbel UVA 23.7 µW/cm² Gröbel UVB 1.48 µW/cm² Gröbel UVC 0.364 µW/cm² Solarmeter 6.4 (D3) 0.692 IU/min UVX-31 5.57 µW/cm² IL UVB 0.00151 µW/cm² IL UVA 25.9 µW/cm² Solarmeter 6.5 (UVI, post 2010) 0.173 UV-Index Solarmeter 6.2 (UVB, post 2010) 1.96 µW/cm² (Solarmeter Ratio = 11.3) Solarmeter AlGaN 6.5 UVI sensor 1.86 UV Index GenUV 7.1 UV-Index 0.116 UV-Index Solarmeter 10.0 (Global Power) 7.54 W/m² Solarmeter 4.0 (UVA) 0.455 mW/cm² LS122 0.00183 W/m² ISM400 5.37 W/m²