Meter readings:
UVB 494μWatt/cm² (actual 387.7)
UVI 21.4
UVA+B offscale
UVC 001μWatt/cm² constant with filter
Lux 19,730 (actual 14,304)
Spectrum 348: BE24 Edit
DeleteMeasurement
| Brand |
Exo Terra Rolf C. Hagen Inc. http://www.hagen.com/ |
|---|---|
| Lamp Product |
Repti Glo 5.0 18W |
| Lamp ID |
BE24 (01/2011) |
| Spectrometer | USB2000+ (2) |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 10 cm |
| Age | 1 hours |
| Originator (measurement) | Frances Baines |
Database entry created:
Sarina Wunderlich
10/Jan/2011 ; 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 | ( 0.22 ; 0.21 ) | ( 0.27 ; 0.46 ) | ( 0.12 ; 0.24 ; 0.4 ) |
| CCT | 0 Kelvin | 8300 Kelvin | 13000 Kelvin |
| distance | 0.12 | 0.13 | |
| 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) 11800 µW/cm² = 118 W/m² UVC ( 0 nm - 280 nm) 19.8 µW/cm² = 0.198 W/m² non-terrestrial ( 0 nm - 290 nm) 26.9 µW/cm² = 0.269 W/m² total2 ( 250 nm - 880 nm) 11800 µW/cm² = 118 W/m² UVB (EU) ( 280 nm - 315 nm) 246 µW/cm² = 2.46 W/m² UVB (US) ( 280 nm - 320 nm) 372 µW/cm² = 3.72 W/m² UVA+B ( 280 nm - 380 nm) 3230 µW/cm² = 32.3 W/m² Solar UVB ( 290 nm - 315 nm) 239 µW/cm² = 2.39 W/m² UVA D3 regulating ( 315 nm - 335 nm) 698 µW/cm² = 6.98 W/m² UVA (EU) ( 315 nm - 380 nm) 2980 µW/cm² = 29.8 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 817 µW/cm² = 8.17 W/m² UVA (US) ( 320 nm - 380 nm) 2860 µW/cm² = 28.6 W/m² UVA1 (variant) ( 335 nm - 380 nm) 2280 µW/cm² = 22.8 W/m² UVA1 (medical) ( 340 nm - 400 nm) 2490 µW/cm² = 24.9 W/m² vis. UVA ( 350 nm - 380 nm) 1540 µW/cm² = 15.4 W/m² VIS Rep3 ( 350 nm - 600 nm) 9360 µW/cm² = 93.6 W/m² VIS Rep4 ( 350 nm - 700 nm) 10000 µW/cm² = 100 W/m² purple ( 380 nm - 420 nm) 1000 µW/cm² = 10 W/m² VIS ( 380 nm - 780 nm) 8540 µW/cm² = 85.4 W/m² PAR ( 400 nm - 700 nm) 8030 µW/cm² = 80.3 W/m² blue ( 420 nm - 490 nm) 4240 µW/cm² = 42.4 W/m² green ( 490 nm - 575 nm) 2210 µW/cm² = 22.1 W/m² yellow ( 575 nm - 585 nm) 200 µW/cm² = 2 W/m² orange ( 585 nm - 650 nm) 756 µW/cm² = 7.56 W/m² red ( 650 nm - 780 nm) 135 µW/cm² = 1.35 W/m² IRA ( 700 nm - 1400 nm) 60.7 µW/cm² = 0.607 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 29.6 UV-Index Pyrimidine dimerization of DNA 153 µW/cm² Photoceratitis 38.9 µW/cm² Photoconjunctivitis 18.8 µW/cm² DNA Damage 23.6 Vitamin D3 82.4 µW/cm² Photosynthesis 6150 µW/cm² Luminosity 17800 lx Human L-Cone 2510 µW/cm² Human M-Cone 2520 µW/cm² Human S-Cone 3500 µW/cm² CIE X 2530 µW/cm² CIE Y 2420 µW/cm² CIE Z 6500 µW/cm² PAR 35500000 mol photons Extinction preD3 643 e-3*m²/mol Extinction Tachysterol 2040 e-3*m²/mol Exctincition PreD3 415000 m²/mol Extinction Lumisterol 269 m²/mol Exctincition Tachysterol 2940000 m²/mol Extinction 7DHC 307 m²/mol L-Cone 1860 µW/cm² M-Cone 3590 µW/cm² S-Cone 6090 µW/cm² U-Cone 3540 µW/cm² UVR - ICNIRP 2004 37.2 Rel Biol Eff Melatonin Supression 4450 µW/cm² Blue Light Hazard 3850 µW/cm² (217 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 89.1 µW/cm² Lumen Reptil 30400 "pseudo-lx" Vitamin D3 Degradation 86.3 µW/cm² Actinic UV 37 µW/cm² (20.8 mW/klm) Exctincition Lumisterol 313000 m²/mol Exctincition 7DHC 339000 m²/mol Exctincition Toxisterols 121000 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 500 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 25.7 Leybold UVB 331 µW/cm² Leybold UVA 2130 µW/cm² Leybold UVC 14.7 µW/cm² DeltaOhm UVB 887 µW/cm² DeltaOhm UVC 116 µW/cm² Vernier UVB 125 µW/cm² Vernier UVA 1740 µW/cm² Gröbel UVA 2510 µW/cm² Gröbel UVB 185 µW/cm² Gröbel UVC 15.8 µW/cm² Solarmeter 6.4 (D3) 80.3 IU/min UVX-31 1040 µW/cm² IL UVB 0.225 µW/cm² IL UVA 2460 µW/cm² Solarmeter 6.5 (UVI, post 2010) 20 UV-Index Solarmeter 6.2 (UVB, post 2010) 322 µW/cm² (Solarmeter Ratio = 16.1) Solarmeter AlGaN 6.5 UVI sensor 214 UV Index GenUV 7.1 UV-Index 12.7 UV-Index Solarmeter 10.0 (Global Power) 87.3 W/m² Solarmeter 4.0 (UVA) 34.2 mW/cm² LS122 0.00244 W/m² ISM400 41.6 W/m²