Linear fluorescent tube
Spectrum 483: BE28 Edit
DeleteMeasurement
| Brand |
Exo Terra Rolf C. Hagen Inc. http://www.hagen.com/ |
|---|---|
| Lamp Product |
Repti Glo 10.0 20W |
| Lamp ID |
BE28 (04/2012) Linear Fluorescent Tube |
| Spectrometer | USB2000+ (2) |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 10 cm |
| Age | 1 hours |
| Originator (measurement) | Frances Baines |
Database entry created:
Frances Baines
23/Oct/2013 ; updated:
Frances Baines
23/Oct/2013
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 284.17 - 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 | ( 0.23 ; 0.23 ) | ( 0.35 ; 0.54 ) | ( 0.16 ; 0.29 ; 0.45 ) |
| CCT | 0 Kelvin | 5900 Kelvin | 8100 Kelvin |
| distance | 0.2 | 0.19 | |
| 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) 810 µW/cm² = 8.1 W/m² UVC ( 0 nm - 280 nm) 0 µW/cm² = 0 W/m² non-terrestrial ( 0 nm - 290 nm) 0.254 µW/cm² = 0.00254 W/m² total2 ( 250 nm - 880 nm) 810 µW/cm² = 8.1 W/m² UVB (EU) ( 280 nm - 315 nm) 49.6 µW/cm² = 0.496 W/m² UVB (US) ( 280 nm - 320 nm) 69.4 µW/cm² = 0.694 W/m² UVA+B ( 280 nm - 380 nm) 184 µW/cm² = 1.84 W/m² Solar UVB ( 290 nm - 315 nm) 49.4 µW/cm² = 0.494 W/m² UVA D3 regulating ( 315 nm - 335 nm) 72 µW/cm² = 0.72 W/m² UVA (EU) ( 315 nm - 380 nm) 134 µW/cm² = 1.34 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 64.6 µW/cm² = 0.646 W/m² UVA (US) ( 320 nm - 380 nm) 114 µW/cm² = 1.14 W/m² UVA1 (variant) ( 335 nm - 380 nm) 62 µW/cm² = 0.62 W/m² UVA1 (medical) ( 340 nm - 400 nm) 54.4 µW/cm² = 0.544 W/m² vis. UVA ( 350 nm - 380 nm) 32.8 µW/cm² = 0.328 W/m² VIS Rep3 ( 350 nm - 600 nm) 601 µW/cm² = 6.01 W/m² VIS Rep4 ( 350 nm - 700 nm) 656 µW/cm² = 6.56 W/m² purple ( 380 nm - 420 nm) 33.3 µW/cm² = 0.333 W/m² VIS ( 380 nm - 780 nm) 626 µW/cm² = 6.26 W/m² PAR ( 400 nm - 700 nm) 619 µW/cm² = 6.19 W/m² blue ( 420 nm - 490 nm) 320 µW/cm² = 3.2 W/m² green ( 490 nm - 575 nm) 184 µW/cm² = 1.84 W/m² yellow ( 575 nm - 585 nm) 15.1 µW/cm² = 0.151 W/m² orange ( 585 nm - 650 nm) 63.9 µW/cm² = 0.639 W/m² red ( 650 nm - 780 nm) 9.53 µW/cm² = 0.0953 W/m² IRA ( 700 nm - 1400 nm) 2.97 µW/cm² = 0.0297 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 4.44 UV-Index Pyrimidine dimerization of DNA 31.3 µW/cm² Photoceratitis 6.72 µW/cm² Photoconjunctivitis 0.204 µW/cm² DNA Damage 0.694 Vitamin D3 17.8 µW/cm² Photosynthesis 468 µW/cm² Luminosity 1480 lx Human L-Cone 208 µW/cm² Human M-Cone 208 µW/cm² Human S-Cone 260 µW/cm² CIE X 201 µW/cm² CIE Y 202 µW/cm² CIE Z 486 µW/cm² PAR 2700000 mol photons Extinction preD3 89.9 e-3*m²/mol Extinction Tachysterol 318 e-3*m²/mol Exctincition PreD3 42800 m²/mol Extinction Lumisterol 23.6 m²/mol Exctincition Tachysterol 424000 m²/mol Extinction 7DHC 25.2 m²/mol L-Cone 156 µW/cm² M-Cone 286 µW/cm² S-Cone 442 µW/cm² U-Cone 89.7 µW/cm² UVR - ICNIRP 2004 4.23 Rel Biol Eff Melatonin Supression 334 µW/cm² Blue Light Hazard 283 µW/cm² (192 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 19.5 µW/cm² Lumen Reptil 2100 "pseudo-lx" Vitamin D3 Degradation 14.6 µW/cm² Actinic UV 4.17 µW/cm² (28.2 mW/klm) Exctincition Lumisterol 30600 m²/mol Exctincition 7DHC 31400 m²/mol Exctincition Toxisterols 5670 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 81.1 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 5.07 Leybold UVB 60.2 µW/cm² Leybold UVA 72.8 µW/cm² Leybold UVC 0.0136 µW/cm² DeltaOhm UVB 108 µW/cm² DeltaOhm UVC 15.4 µW/cm² Vernier UVB 27.3 µW/cm² Vernier UVA 104 µW/cm² Gröbel UVA 110 µW/cm² Gröbel UVB 34.8 µW/cm² Gröbel UVC -0.0117 µW/cm² Solarmeter 6.4 (D3) 15.8 IU/min UVX-31 115 µW/cm² IL UVB 0.0338 µW/cm² IL UVA 88.1 µW/cm² Solarmeter 6.5 (UVI, post 2010) 3.89 UV-Index Solarmeter 6.2 (UVB, post 2010) 49.9 µW/cm² (Solarmeter Ratio = 12.8) Solarmeter AlGaN 6.5 UVI sensor 42.8 UV Index GenUV 7.1 UV-Index 2.26 UV-Index Solarmeter 10.0 (Global Power) 6.29 W/m² Solarmeter 4.0 (UVA) 1.19 mW/cm² LS122 0 W/m² ISM400 3.18 W/m²