Spectrum 470: BZC19 Edit
DeleteMeasurement
| Brand |
Zoo Med Zoo Med Laboratories, Inc http://www.zoomed.com/ |
|---|---|
| Lamp Product |
ReptiSun 10.0 26W 2006: change to lamps with slits in base 2009: change to lamps with yellowish phsophor without <290nm radiation |
| Lamp ID |
BZC19 (09/2009) New version launched in 2009 to replace lamps with very short-wavelength UVB |
| Spectrometer | USB2000+ (2) |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 10 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 | ( 0.29 ; 0.3 ) | ( 0.41 ; 0.46 ) | ( 0.25 ; 0.31 ; 0.34 ) |
| CCT | 8700 Kelvin | 4900 Kelvin | 5600 Kelvin |
| distance | 0.12 | 0.098 | |
| 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) 1850 µW/cm² = 18.5 W/m² UVC ( 0 nm - 280 nm) 0.00652 µW/cm² = 6.52E-5 W/m² non-terrestrial ( 0 nm - 290 nm) 0.13 µW/cm² = 0.0013 W/m² total2 ( 250 nm - 880 nm) 1850 µW/cm² = 18.5 W/m² UVB (EU) ( 280 nm - 315 nm) 79.9 µW/cm² = 0.799 W/m² UVB (US) ( 280 nm - 320 nm) 124 µW/cm² = 1.24 W/m² UVA+B ( 280 nm - 380 nm) 459 µW/cm² = 4.59 W/m² Solar UVB ( 290 nm - 315 nm) 79.8 µW/cm² = 0.798 W/m² UVA D3 regulating ( 315 nm - 335 nm) 179 µW/cm² = 1.79 W/m² UVA (EU) ( 315 nm - 380 nm) 379 µW/cm² = 3.79 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 180 µW/cm² = 1.8 W/m² UVA (US) ( 320 nm - 380 nm) 335 µW/cm² = 3.35 W/m² UVA1 (variant) ( 335 nm - 380 nm) 201 µW/cm² = 2.01 W/m² UVA1 (medical) ( 340 nm - 400 nm) 161 µW/cm² = 1.61 W/m² vis. UVA ( 350 nm - 380 nm) 83.6 µW/cm² = 0.836 W/m² VIS Rep3 ( 350 nm - 600 nm) 1120 µW/cm² = 11.2 W/m² VIS Rep4 ( 350 nm - 700 nm) 1420 µW/cm² = 14.2 W/m² purple ( 380 nm - 420 nm) 69.5 µW/cm² = 0.695 W/m² VIS ( 380 nm - 780 nm) 1390 µW/cm² = 13.9 W/m² VIS2 ( 400 nm - 680 nm) 1290 µW/cm² = 12.9 W/m² PAR ( 400 nm - 700 nm) 1330 µW/cm² = 13.3 W/m² tmp ( 400 nm - 1100 nm) 1380 µW/cm² = 13.8 W/m² blue ( 420 nm - 490 nm) 440 µW/cm² = 4.4 W/m² green ( 490 nm - 575 nm) 419 µW/cm² = 4.19 W/m² yellow ( 575 nm - 585 nm) 60.1 µW/cm² = 0.601 W/m² orange ( 585 nm - 650 nm) 229 µW/cm² = 2.29 W/m² red ( 650 nm - 780 nm) 173 µW/cm² = 1.73 W/m² IRA ( 700 nm - 1400 nm) 51.8 µW/cm² = 0.518 W/m² IR2 ( 720 nm - 1100 nm) 24.9 µW/cm² = 0.249 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 4.35 UV-Index Pyrimidine dimerization of DNA 47.1 µW/cm² Photoceratitis 6.95 µW/cm² Photoconjunctivitis 0.137 µW/cm² DNA Damage 0.433 Vitamin D3 19.2 µW/cm² Photosynthesis 949 µW/cm² Luminosity 3590 lx Human L-Cone 526 µW/cm² Human M-Cone 468 µW/cm² Human S-Cone 357 µW/cm² CIE X 472 µW/cm² CIE Y 497 µW/cm² CIE Z 673 µW/cm² PAR 6290000 mol photons Extinction preD3 132 e-3*m²/mol Extinction Tachysterol 466 e-3*m²/mol Exctincition PreD3 61500 m²/mol Extinction Lumisterol 17.3 m²/mol Exctincition Tachysterol 656000 m²/mol Extinction 7DHC 14.7 m²/mol L-Cone 431 µW/cm² M-Cone 536 µW/cm² S-Cone 598 µW/cm² U-Cone 178 µW/cm² UVR - ICNIRP 2004 3.3 Rel Biol Eff Melatonin Supression 500 µW/cm² Blue Light Hazard 392 µW/cm² (109 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 21.2 µW/cm² Lumen Reptil 3970 "pseudo-lx" Vitamin D3 Degradation 23.7 µW/cm² Actinic UV 3.27 µW/cm² (9.11 mW/klm) Exctincition Lumisterol 26000 m²/mol Exctincition 7DHC 19500 m²/mol Exctincition Toxisterols 10500 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 146 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 5.52 Leybold UVB 106 µW/cm² Leybold UVA 233 µW/cm² Leybold UVC 0.0106 µW/cm² DeltaOhm UVB 239 µW/cm² DeltaOhm UVC 29.6 µW/cm² Vernier UVB 37.2 µW/cm² Vernier UVA 290 µW/cm² Gröbel UVA 319 µW/cm² Gröbel UVB 52.9 µW/cm² Gröbel UVC -0.025 µW/cm² Luxmeter 3710 lx Solarmeter 6.4 (D3) 17.2 IU/min UVX-31 256 µW/cm² IL UVB 0.0603 µW/cm² IL UVA 263 µW/cm² Solarmeter 6.5 (UVI, post 2010) 4.64 UV-Index Solarmeter 6.2 (UVB, post 2010) 97.3 µW/cm² (Solarmeter Ratio = 21) Solarmeter AlGaN 6.5 UVI sensor 65.7 UV Index GenUV 7.1 UV-Index 3.68 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 16 W/m² Solarmeter 4.0 (UVA) 3.4 mW/cm² LS122 (manuf.) 0 W/m² ISM400 (first guess) 9.88 W/m² LS122 (assumption) 0.454 W/m² ISM400_new 7.93 W/m² Solarmeter 10.0 (Global Power) (assumption) 14.3 W/m²