Meter readings
UVB 56 - 58μWatt/cm² (actual 66.2)
UVI 1.3 - 1.6
UVA+B 157 - 158μWatt/cm² (actual 301.8, or 235.6 with only 50% of UVB)
UVC 000μWatt/cm²
Lux 34,100 - 36,500 (actual 33,126)
Spectrum 349: BE25 Edit
DeleteMeasurement
| Brand |
Exo Terra Rolf C. Hagen Inc. http://www.hagen.com/ |
|---|---|
| Lamp Product |
Repti Glo 2.0 18W |
| Lamp ID |
BE25 (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 | ( 0.3 ; 0.3 ) | ( 0.42 ; 0.52 ) | ( 0.27 ; 0.3 ; 0.38 ) |
| CCT | 8000 Kelvin | 4900 Kelvin | 5200 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) 13400 µW/cm² = 134 W/m² UVC ( 0 nm - 280 nm) 18 µW/cm² = 0.18 W/m² non-terrestrial ( 0 nm - 290 nm) 22.7 µW/cm² = 0.227 W/m² total2 ( 250 nm - 880 nm) 13400 µW/cm² = 134 W/m² UVB (EU) ( 280 nm - 315 nm) 51.4 µW/cm² = 0.514 W/m² UVB (US) ( 280 nm - 320 nm) 64.6 µW/cm² = 0.646 W/m² UVA+B ( 280 nm - 380 nm) 280 µW/cm² = 2.8 W/m² Solar UVB ( 290 nm - 315 nm) 46.7 µW/cm² = 0.467 W/m² UVA D3 regulating ( 315 nm - 335 nm) 58.5 µW/cm² = 0.585 W/m² UVA (EU) ( 315 nm - 380 nm) 229 µW/cm² = 2.29 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 61.8 µW/cm² = 0.618 W/m² UVA (US) ( 320 nm - 380 nm) 216 µW/cm² = 2.16 W/m² UVA1 (variant) ( 335 nm - 380 nm) 170 µW/cm² = 1.7 W/m² UVA1 (medical) ( 340 nm - 400 nm) 175 µW/cm² = 1.75 W/m² vis. UVA ( 350 nm - 380 nm) 125 µW/cm² = 1.25 W/m² VIS Rep3 ( 350 nm - 600 nm) 10500 µW/cm² = 105 W/m² VIS Rep4 ( 350 nm - 700 nm) 13000 µW/cm² = 130 W/m² purple ( 380 nm - 420 nm) 403 µW/cm² = 4.03 W/m² VIS ( 380 nm - 780 nm) 13100 µW/cm² = 131 W/m² VIS2 ( 400 nm - 680 nm) 12800 µW/cm² = 128 W/m² PAR ( 400 nm - 700 nm) 12900 µW/cm² = 129 W/m² tmp ( 400 nm - 1100 nm) 13100 µW/cm² = 131 W/m² blue ( 420 nm - 490 nm) 4880 µW/cm² = 48.8 W/m² green ( 490 nm - 575 nm) 4110 µW/cm² = 41.1 W/m² yellow ( 575 nm - 585 nm) 401 µW/cm² = 4.01 W/m² orange ( 585 nm - 650 nm) 2870 µW/cm² = 28.7 W/m² red ( 650 nm - 780 nm) 446 µW/cm² = 4.46 W/m² IRA ( 700 nm - 1400 nm) 212 µW/cm² = 2.12 W/m² IR2 ( 720 nm - 1100 nm) 40.5 µW/cm² = 0.405 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 12.6 UV-Index Pyrimidine dimerization of DNA 22.5 µW/cm² Photoceratitis 14.3 µW/cm² Photoconjunctivitis 16.6 µW/cm² DNA Damage 19.3 Vitamin D3 18.5 µW/cm² Photosynthesis 9120 µW/cm² Luminosity 38500 lx Human L-Cone 5710 µW/cm² Human M-Cone 4890 µW/cm² Human S-Cone 3890 µW/cm² CIE X 5380 µW/cm² CIE Y 5320 µW/cm² CIE Z 7320 µW/cm² PAR 58000000 mol photons Extinction preD3 247 e-3*m²/mol Extinction Tachysterol 628 e-3*m²/mol Exctincition PreD3 204000 m²/mol Extinction Lumisterol 171 m²/mol Exctincition Tachysterol 804000 m²/mol Extinction 7DHC 203 m²/mol L-Cone 4670 µW/cm² M-Cone 5190 µW/cm² S-Cone 6500 µW/cm² U-Cone 778 µW/cm² UVR - ICNIRP 2004 20.6 Rel Biol Eff Melatonin Supression 5200 µW/cm² Blue Light Hazard 4220 µW/cm² (110 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 18.9 µW/cm² Lumen Reptil 40200 "pseudo-lx" Vitamin D3 Degradation 18.9 µW/cm² Actinic UV 20.5 µW/cm² (5.33 mW/klm) Exctincition Lumisterol 186000 m²/mol Exctincition 7DHC 214000 m²/mol Exctincition Toxisterols 83000 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 94.2 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 6.62 Leybold UVB 51.1 µW/cm² Leybold UVA 154 µW/cm² Leybold UVC 13.8 µW/cm² DeltaOhm UVB 99.4 µW/cm² DeltaOhm UVC 28.4 µW/cm² Vernier UVB 21.4 µW/cm² Vernier UVA 138 µW/cm² Gröbel UVA 197 µW/cm² Gröbel UVB 34.8 µW/cm² Gröbel UVC 14.6 µW/cm² Luxmeter 39300 lx Solarmeter 6.4 (D3) 20.7 IU/min UVX-31 111 µW/cm² IL UVB 0.0363 µW/cm² IL UVA 188 µW/cm² Solarmeter 6.5 (UVI, post 2010) 5.14 UV-Index Solarmeter 6.2 (UVB, post 2010) 49.1 µW/cm² (Solarmeter Ratio = 9.56) Solarmeter AlGaN 6.5 UVI sensor 41.2 UV Index GenUV 7.1 UV-Index 2.74 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 131 W/m² Solarmeter 4.0 (UVA) 2.88 mW/cm² LS122 (manuf.) 0.0103 W/m² ISM400 (first guess) 83.1 W/m² LS122 (assumption) 3.97 W/m² ISM400_new 64.4 W/m² Solarmeter 10.0 (Global Power) (assumption) 123 W/m²