Reptile Lamp Database

Spectrum 195: BE17 Edit
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Full Spectrum

Measurement

Brand Exo Terra
Rolf C. Hagen Inc. http://www.hagen.com/
Lamp Product Repti Glo 2.0 20W
Lamp ID BE17 (02/2008)
Spectrometer USB 2000
Ballast - no ballast or default/unknown ballast -
Reflector
Distance 10 cm
Age 1 hours
Originator (measurement) Frances Baines
Database entry created: Maren 9/Jun/2010 ; updated: Sarina Wunderlich 9/Oct/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.

Spectrum in the visible wavelength range

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, 338451, 511513 ), 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 ; 0.31 ) ( 0.44 ; 0.51 ) ( 0.29 ; 0.31 ; 0.36 )
CCT 7000 Kelvin 4600 Kelvin 4900 Kelvin
distance 0.17 0.12
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.

Spectrum in the vitamin D3 active wavelength range

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
then any Solarmeter 6.2 reading multiplied with 0.7 (0.7=13.8/19.6) is an estimate of UVB irradiance for this specific lamp. If you do so, always make sure, that the calculated (effective) irradiance is valid. The calculated value is not valid, if the lamp's spectrum is not measured in the relevant range.

Ranges
total ( 0 nm - 0 nm) 908 µW/cm² = 9.08 W/m²
UVC ( 0 nm - 280 nm) 0 µW/cm² = 0 W/m²
non-terrestrial ( 0 nm - 290 nm) 0 µW/cm² = 0 W/m²
total2 ( 250 nm - 880 nm) 908 µW/cm² = 9.08 W/m²
UVB (EU) ( 280 nm - 315 nm) 1.48 µW/cm² = 0.0148 W/m²
UVB (US) ( 280 nm - 320 nm) 2.13 µW/cm² = 0.0213 W/m²
UVA+B ( 280 nm - 380 nm) 12.7 µW/cm² = 0.127 W/m²
Solar UVB ( 290 nm - 315 nm) 1.48 µW/cm² = 0.0148 W/m²
UVA D3 regulating ( 315 nm - 335 nm) 2.99 µW/cm² = 0.0299 W/m²
UVA (EU) ( 315 nm - 380 nm) 11.2 µW/cm² = 0.112 W/m²
UVA2 (medical definition) ( 320 nm - 340 nm) 3.19 µW/cm² = 0.0319 W/m²
UVA (US) ( 320 nm - 380 nm) 10.6 µW/cm² = 0.106 W/m²
UVA1 (variant) ( 335 nm - 380 nm) 8.24 µW/cm² = 0.0824 W/m²
UVA1 (medical) ( 340 nm - 400 nm) 7.62 µW/cm² = 0.0762 W/m²
vis. UVA ( 350 nm - 380 nm) 5.92 µW/cm² = 0.0592 W/m²
VIS Rep3 ( 350 nm - 600 nm) 701 µW/cm² = 7.01 W/m²
VIS Rep4 ( 350 nm - 700 nm) 882 µW/cm² = 8.82 W/m²
purple ( 380 nm - 420 nm) 22.2 µW/cm² = 0.222 W/m²
VIS ( 380 nm - 780 nm) 891 µW/cm² = 8.91 W/m²
PAR ( 400 nm - 700 nm) 876 µW/cm² = 8.76 W/m²
blue ( 420 nm - 490 nm) 312 µW/cm² = 3.12 W/m²
green ( 490 nm - 575 nm) 290 µW/cm² = 2.9 W/m²
yellow ( 575 nm - 585 nm) 29.3 µW/cm² = 0.293 W/m²
orange ( 585 nm - 650 nm) 205 µW/cm² = 2.05 W/m²
red ( 650 nm - 780 nm) 33 µW/cm² = 0.33 W/m²
IRA ( 700 nm - 1400 nm) 19.5 µW/cm² = 0.195 W/m²
IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 0.0355 UV-Index
Pyrimidine dimerization of DNA 0.633 µW/cm²
Photoceratitis 0.0777 µW/cm²
Photoconjunctivitis 8.67E-5 µW/cm²
DNA Damage 0.000777
Vitamin D3 0.171 µW/cm²
Photosynthesis 610 µW/cm²
Luminosity 2730 lx
Human L-Cone 406 µW/cm²
Human M-Cone 345 µW/cm²
Human S-Cone 246 µW/cm²
CIE X 374 µW/cm²
CIE Y 378 µW/cm²
CIE Z 463 µW/cm²
PAR 3940000 mol photons
Extinction preD3 1.89 e-3*m²/mol
Extinction Tachysterol 6.69 e-3*m²/mol
Exctincition PreD3 875 m²/mol
Extinction Lumisterol 0.055 m²/mol
Exctincition Tachysterol 9760 m²/mol
Extinction 7DHC 0.00423 m²/mol
L-Cone 333 µW/cm²
M-Cone 351 µW/cm²
S-Cone 407 µW/cm²
U-Cone 42.3 µW/cm²
UVR - ICNIRP 2004 0.015 Rel Biol Eff
Melatonin Supression 334 µW/cm²
Blue Light Hazard 268 µW/cm² (98.1 µW/cm² per 1000 lx)
CIE 174:2006 PreVit D3 0.166 µW/cm²
Lumen Reptil 2700 "pseudo-lx"
Vitamin D3 Degradation 0.365 µW/cm²
Actinic UV 0.0151 µW/cm² (0.0553 mW/klm)
Exctincition Lumisterol 159 m²/mol
Exctincition 7DHC 42.8 m²/mol
Exctincition Toxisterols 170 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 2.43 µW/cm²
Solarmeter 6.5 (UV-Index, pre 2010) 0.0462
Leybold UVB 1.79 µW/cm²
Leybold UVA 7.62 µW/cm²
Leybold UVC 0 µW/cm²
DeltaOhm UVB 4.16 µW/cm²
DeltaOhm UVC 0.492 µW/cm²
Vernier UVB 0.453 µW/cm²
Vernier UVA 6.37 µW/cm²
Gröbel UVA 9.72 µW/cm²
Gröbel UVB 0.796 µW/cm²
Gröbel UVC -0.000827 µW/cm²
Solarmeter 6.4 (D3) 0.144 IU/min
UVX-31 4.66 µW/cm²
IL UVB 0.000983 µW/cm²
IL UVA 9.13 µW/cm²
Solarmeter 6.5 (UVI, post 2010) 0.0464 UV-Index
Solarmeter 6.2 (UVB, post 2010) 1.64 µW/cm² (Solarmeter Ratio = 35.3)
Solarmeter AlGaN 6.5 UVI sensor 1.08 UV Index
GenUV 7.1 UV-Index 0.0613 UV-Index
Solarmeter 10.0 (Global Power) 9.04 W/m²
Solarmeter 4.0 (UVA) 0.139 mW/cm²
LS122 0.0086 W/m²
ISM400 5.9 W/m²