Reptile Lamp Database

Spectrum 258: BRR3 Edit
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Lamp type associated with PKC

Measurement

Brand other
other
Lamp Product Chinese Tropic Sun 8.0 T8 18W
Lamp ID BRR3 (03/2007)
Lamp type associated with PKC
Spectrometer USB 2000
Ballast - no ballast or default/unknown ballast -
Reflector
Distance 10 cm
Age 112 hours
Originator (measurement) Frances Baines
Database entry created: Maren 11/Jun/2010 ; 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.

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 ( 0.28 ; 0.3 ) ( 0.36 ; 0.46 ) ( 0.23 ; 0.28 ; 0.35 )
CCT 9400 Kelvin 5700 Kelvin 6200 Kelvin
distance 0.12 0.096
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) 760 µW/cm² = 7.6 W/m²
UVC ( 0 nm - 280 nm) 2.49 µW/cm² = 0.0249 W/m²
non-terrestrial ( 0 nm - 290 nm) 7.37 µW/cm² = 0.0737 W/m²
total2 ( 250 nm - 880 nm) 760 µW/cm² = 7.6 W/m²
UVB (EU) ( 280 nm - 315 nm) 75.4 µW/cm² = 0.754 W/m²
UVB (US) ( 280 nm - 320 nm) 87.4 µW/cm² = 0.874 W/m²
UVA+B ( 280 nm - 380 nm) 136 µW/cm² = 1.36 W/m²
Solar UVB ( 290 nm - 315 nm) 70.5 µW/cm² = 0.705 W/m²
UVA D3 regulating ( 315 nm - 335 nm) 32.3 µW/cm² = 0.323 W/m²
UVA (EU) ( 315 nm - 380 nm) 60.9 µW/cm² = 0.609 W/m²
UVA2 (medical definition) ( 320 nm - 340 nm) 23.8 µW/cm² = 0.238 W/m²
UVA (US) ( 320 nm - 380 nm) 48.8 µW/cm² = 0.488 W/m²
UVA1 (variant) ( 335 nm - 380 nm) 28.6 µW/cm² = 0.286 W/m²
UVA1 (medical) ( 340 nm - 400 nm) 38.1 µW/cm² = 0.381 W/m²
vis. UVA ( 350 nm - 380 nm) 20.7 µW/cm² = 0.207 W/m²
VIS Rep3 ( 350 nm - 600 nm) 493 µW/cm² = 4.93 W/m²
VIS Rep4 ( 350 nm - 700 nm) 605 µW/cm² = 6.05 W/m²
purple ( 380 nm - 420 nm) 54.3 µW/cm² = 0.543 W/m²
VIS ( 380 nm - 780 nm) 614 µW/cm² = 6.14 W/m²
PAR ( 400 nm - 700 nm) 571 µW/cm² = 5.71 W/m²
blue ( 420 nm - 490 nm) 190 µW/cm² = 1.9 W/m²
green ( 490 nm - 575 nm) 182 µW/cm² = 1.82 W/m²
yellow ( 575 nm - 585 nm) 24 µW/cm² = 0.24 W/m²
orange ( 585 nm - 650 nm) 88.4 µW/cm² = 0.884 W/m²
red ( 650 nm - 780 nm) 75.1 µW/cm² = 0.751 W/m²
IRA ( 700 nm - 1400 nm) 37 µW/cm² = 0.37 W/m²
IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 13.3 UV-Index
Pyrimidine dimerization of DNA 43.4 µW/cm²
Photoceratitis 20.1 µW/cm²
Photoconjunctivitis 3.44 µW/cm²
DNA Damage 6.33
Vitamin D3 39.9 µW/cm²
Photosynthesis 407 µW/cm²
Luminosity 1520 lx
Human L-Cone 221 µW/cm²
Human M-Cone 200 µW/cm²
Human S-Cone 159 µW/cm²
CIE X 197 µW/cm²
CIE Y 210 µW/cm²
CIE Z 293 µW/cm²
PAR 2680000 mol photons
Extinction preD3 189 e-3*m²/mol
Extinction Tachysterol 659 e-3*m²/mol
Exctincition PreD3 113000 m²/mol
Extinction Lumisterol 111 m²/mol
Exctincition Tachysterol 843000 m²/mol
Extinction 7DHC 140 m²/mol
L-Cone 180 µW/cm²
M-Cone 220 µW/cm²
S-Cone 278 µW/cm²
U-Cone 106 µW/cm²
UVR - ICNIRP 2004 17 Rel Biol Eff
Melatonin Supression 219 µW/cm²
Blue Light Hazard 180 µW/cm² (118 µW/cm² per 1000 lx)
CIE 174:2006 PreVit D3 42.4 µW/cm²
Lumen Reptil 1760 "pseudo-lx"
Vitamin D3 Degradation 23.8 µW/cm²
Actinic UV 16.9 µW/cm² (111 mW/klm)
Exctincition Lumisterol 131000 m²/mol
Exctincition 7DHC 163000 m²/mol
Exctincition Toxisterols 17500 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 105 µW/cm²
Solarmeter 6.5 (UV-Index, pre 2010) 12.1
Leybold UVB 72.9 µW/cm²
Leybold UVA 30.7 µW/cm²
Leybold UVC 1.79 µW/cm²
DeltaOhm UVB 90 µW/cm²
DeltaOhm UVC 19.2 µW/cm²
Vernier UVB 44.6 µW/cm²
Vernier UVA 50.4 µW/cm²
Gröbel UVA 52.7 µW/cm²
Gröbel UVB 57.4 µW/cm²
Gröbel UVC 2.06 µW/cm²
Solarmeter 6.4 (D3) 37.7 IU/min
UVX-31 96.8 µW/cm²
IL UVB 0.0461 µW/cm²
IL UVA 41.3 µW/cm²
Solarmeter 6.5 (UVI, post 2010) 8.12 UV-Index
Solarmeter 6.2 (UVB, post 2010) 52.1 µW/cm² (Solarmeter Ratio = 6.41)
Solarmeter AlGaN 6.5 UVI sensor 65.8 UV Index
GenUV 7.1 UV-Index 3.36 UV-Index
Solarmeter 10.0 (Global Power) 6.74 W/m²
Solarmeter 4.0 (UVA) 0.69 mW/cm²
LS122 0.00882 W/m²
ISM400 4.34 W/m²