Reptile Lamp Database

Spectrum 185: BT2 Edit
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Full Spectrum

Measurement

Brand Interpet
Interpet Ltd http://www.interpet.co.uk/
Lamp Product Triton Reptile 18W
Lamp ID BT2 (02/2007)
Spectrometer USB 2000
Ballast - no ballast or default/unknown ballast -
Reflector
Distance 10 cm
Age 105 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 ; 0.32 ) ( 0.36 ; 0.46 ) ( 0.27 ; 0.26 ; 0.34 )
CCT 6700 Kelvin 5800 Kelvin 5500 Kelvin
distance 0.12 0.085
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) 654 µW/cm² = 6.54 W/m²
UVC ( 0 nm - 280 nm) 1.5 µW/cm² = 0.015 W/m²
non-terrestrial ( 0 nm - 290 nm) 1.9 µW/cm² = 0.019 W/m²
total2 ( 250 nm - 880 nm) 654 µW/cm² = 6.54 W/m²
UVB (EU) ( 280 nm - 315 nm) 12.4 µW/cm² = 0.124 W/m²
UVB (US) ( 280 nm - 320 nm) 21.8 µW/cm² = 0.218 W/m²
UVA+B ( 280 nm - 380 nm) 148 µW/cm² = 1.48 W/m²
Solar UVB ( 290 nm - 315 nm) 12 µW/cm² = 0.12 W/m²
UVA D3 regulating ( 315 nm - 335 nm) 49.4 µW/cm² = 0.494 W/m²
UVA (EU) ( 315 nm - 380 nm) 136 µW/cm² = 1.36 W/m²
UVA2 (medical definition) ( 320 nm - 340 nm) 59 µW/cm² = 0.59 W/m²
UVA (US) ( 320 nm - 380 nm) 127 µW/cm² = 1.27 W/m²
UVA1 (variant) ( 335 nm - 380 nm) 86.6 µW/cm² = 0.866 W/m²
UVA1 (medical) ( 340 nm - 400 nm) 74.7 µW/cm² = 0.747 W/m²
vis. UVA ( 350 nm - 380 nm) 34.1 µW/cm² = 0.341 W/m²
VIS Rep3 ( 350 nm - 600 nm) 382 µW/cm² = 3.82 W/m²
VIS Rep4 ( 350 nm - 700 nm) 498 µW/cm² = 4.98 W/m²
purple ( 380 nm - 420 nm) 34.2 µW/cm² = 0.342 W/m²
VIS ( 380 nm - 780 nm) 494 µW/cm² = 4.94 W/m²
PAR ( 400 nm - 700 nm) 456 µW/cm² = 4.56 W/m²
blue ( 420 nm - 490 nm) 132 µW/cm² = 1.32 W/m²
green ( 490 nm - 575 nm) 140 µW/cm² = 1.4 W/m²
yellow ( 575 nm - 585 nm) 20.1 µW/cm² = 0.201 W/m²
orange ( 585 nm - 650 nm) 89.8 µW/cm² = 0.898 W/m²
red ( 650 nm - 780 nm) 77.1 µW/cm² = 0.771 W/m²
IRA ( 700 nm - 1400 nm) 40.4 µW/cm² = 0.404 W/m²
IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 1.52 UV-Index
Pyrimidine dimerization of DNA 7.94 µW/cm²
Photoceratitis 1.9 µW/cm²
Photoconjunctivitis 1.38 µW/cm²
DNA Damage 1.63
Vitamin D3 3.62 µW/cm²
Photosynthesis 321 µW/cm²
Luminosity 1260 lx
Human L-Cone 187 µW/cm²
Human M-Cone 159 µW/cm²
Human S-Cone 112 µW/cm²
CIE X 172 µW/cm²
CIE Y 175 µW/cm²
CIE Z 206 µW/cm²
PAR 2170000 mol photons
Extinction preD3 37.6 e-3*m²/mol
Extinction Tachysterol 115 e-3*m²/mol
Exctincition PreD3 25800 m²/mol
Extinction Lumisterol 15.9 m²/mol
Exctincition Tachysterol 171000 m²/mol
Extinction 7DHC 18.1 m²/mol
L-Cone 157 µW/cm²
M-Cone 153 µW/cm²
S-Cone 198 µW/cm²
U-Cone 79.2 µW/cm²
UVR - ICNIRP 2004 2.05 Rel Biol Eff
Melatonin Supression 151 µW/cm²
Blue Light Hazard 127 µW/cm² (101 µW/cm² per 1000 lx)
CIE 174:2006 PreVit D3 3.88 µW/cm²
Lumen Reptil 1340 "pseudo-lx"
Vitamin D3 Degradation 4.88 µW/cm²
Actinic UV 2.04 µW/cm² (16.2 mW/klm)
Exctincition Lumisterol 18200 m²/mol
Exctincition 7DHC 19500 m²/mol
Exctincition Toxisterols 8550 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 29.6 µW/cm²
Solarmeter 6.5 (UV-Index, pre 2010) 1.18
Leybold UVB 19.1 µW/cm²
Leybold UVA 95.9 µW/cm²
Leybold UVC 1.13 µW/cm²
DeltaOhm UVB 59.3 µW/cm²
DeltaOhm UVC 7.49 µW/cm²
Vernier UVB 5.84 µW/cm²
Vernier UVA 97.2 µW/cm²
Gröbel UVA 116 µW/cm²
Gröbel UVB 9.87 µW/cm²
Gröbel UVC 1.2 µW/cm²
Solarmeter 6.4 (D3) 3.67 IU/min
UVX-31 66.5 µW/cm²
IL UVB 0.0133 µW/cm²
IL UVA 102 µW/cm²
Solarmeter 6.5 (UVI, post 2010) 0.967 UV-Index
Solarmeter 6.2 (UVB, post 2010) 20.1 µW/cm² (Solarmeter Ratio = 20.7)
Solarmeter AlGaN 6.5 UVI sensor 11.1 UV Index
GenUV 7.1 UV-Index 0.696 UV-Index
Solarmeter 10.0 (Global Power) 5.94 W/m²
Solarmeter 4.0 (UVA) 1.32 mW/cm²
LS122 0.0135 W/m²
ISM400 3.99 W/m²