Reptile Lamp Database

Spectrum 600: SW29 Edit
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Full Spectrum

with reflector sheet in the wrong orientation

Measurement

Brand Repti-Zoo
Brand by Dongguan ETAN Pet Supplies Co., Ltd., located in China. http://www.repti-zoo.com/en/index.php.
Lamp Product Desert UVB10.0 T5HO 24W
Lamp ID SW29 (05/2022)
donated by Stephanie O’Brien-Chance / Thomas Griffiths , bought in the US by Stephanie O’Brien-Chance
Spectrometer USB2000+
Ballast - no ballast or default/unknown ballast -
Reflector
Distance 5 cm
Age 43 hours
Originator (measurement) Sarina Wunderlich
Database entry created: Sarina Wunderlich 25/May/2022 ; updated: Sarina Wunderlich 25/May/2022

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 ( 0.29 ; 0.33 ) ( 0.31 ; 0.46 ) ( 0.25 ; 0.23 ; 0.34 )
CCT 7600 Kelvin 7000 Kelvin 6100 Kelvin
distance 0.12 0.092
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) 4920 µW/cm² = 49.2 W/m²
UVC ( 0 nm - 280 nm) -4.35 µW/cm² = -0.0435 W/m²
non-terrestrial ( 0 nm - 290 nm) -4.35 µW/cm² = -0.0435 W/m²
total2 ( 250 nm - 880 nm) 4920 µW/cm² = 49.2 W/m²
UVB (EU) ( 280 nm - 315 nm) 102 µW/cm² = 1.02 W/m²
UVB (US) ( 280 nm - 320 nm) 152 µW/cm² = 1.52 W/m²
UVA+B ( 280 nm - 380 nm) 844 µW/cm² = 8.44 W/m²
Solar UVB ( 290 nm - 315 nm) 102 µW/cm² = 1.02 W/m²
UVA D3 regulating ( 315 nm - 335 nm) 262 µW/cm² = 2.62 W/m²
UVA (EU) ( 315 nm - 380 nm) 741 µW/cm² = 7.41 W/m²
UVA2 (medical definition) ( 320 nm - 340 nm) 293 µW/cm² = 2.93 W/m²
UVA (US) ( 320 nm - 380 nm) 692 µW/cm² = 6.92 W/m²
UVA1 (variant) ( 335 nm - 380 nm) 479 µW/cm² = 4.79 W/m²
UVA1 (medical) ( 340 nm - 400 nm) 470 µW/cm² = 4.7 W/m²
vis. UVA ( 350 nm - 380 nm) 257 µW/cm² = 2.57 W/m²
VIS Rep3 ( 350 nm - 600 nm) 3650 µW/cm² = 36.5 W/m²
VIS Rep4 ( 350 nm - 700 nm) 4200 µW/cm² = 42 W/m²
purple ( 380 nm - 420 nm) 466 µW/cm² = 4.66 W/m²
VIS ( 380 nm - 780 nm) 4060 µW/cm² = 40.6 W/m²
PAR ( 400 nm - 700 nm) 3880 µW/cm² = 38.8 W/m²
blue ( 420 nm - 490 nm) 1180 µW/cm² = 11.8 W/m²
green ( 490 nm - 575 nm) 1340 µW/cm² = 13.4 W/m²
yellow ( 575 nm - 585 nm) 254 µW/cm² = 2.54 W/m²
orange ( 585 nm - 650 nm) 512 µW/cm² = 5.12 W/m²
red ( 650 nm - 780 nm) 313 µW/cm² = 3.13 W/m²
IRA ( 700 nm - 1400 nm) 131 µW/cm² = 1.31 W/m²
IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 6.62 UV-Index
Pyrimidine dimerization of DNA 60 µW/cm²
Photoceratitis 10.5 µW/cm²
Photoconjunctivitis 0.239 µW/cm²
DNA Damage 0.836
Vitamin D3 27.2 µW/cm²
Photosynthesis 2630 µW/cm²
Luminosity 11800 lx
Human L-Cone 1720 µW/cm²
Human M-Cone 1550 µW/cm²
Human S-Cone 1030 µW/cm²
CIE X 1450 µW/cm²
CIE Y 1650 µW/cm²
CIE Z 1870 µW/cm²
PAR 18900000 mol photons
Extinction preD3 173 e-3*m²/mol
Extinction Tachysterol 616 e-3*m²/mol
Exctincition PreD3 84900 m²/mol
Extinction Lumisterol 30.2 m²/mol
Exctincition Tachysterol 905000 m²/mol
Extinction 7DHC 30.6 m²/mol
L-Cone 1400 µW/cm²
M-Cone 1270 µW/cm²
S-Cone 1900 µW/cm²
U-Cone 941 µW/cm²
UVR - ICNIRP 2004 5.62 Rel Biol Eff
Melatonin Supression 1370 µW/cm²
Blue Light Hazard 1180 µW/cm² (99.8 µW/cm² per 1000 lx)
CIE 174:2006 PreVit D3 29.6 µW/cm²
Lumen Reptil 12500 "pseudo-lx"
Vitamin D3 Degradation 30.6 µW/cm²
Actinic UV 5.56 µW/cm² (4.72 mW/klm)
Exctincition Lumisterol 42100 m²/mol
Exctincition 7DHC 38700 m²/mol
Exctincition Toxisterols 14700 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 184 µW/cm²
Solarmeter 6.5 (UV-Index, pre 2010) 7.81
Leybold UVB 134 µW/cm²
Leybold UVA 506 µW/cm²
Leybold UVC 0.0177 µW/cm²
DeltaOhm UVB 334 µW/cm²
DeltaOhm UVC 38.3 µW/cm²
Vernier UVB 46.9 µW/cm²
Vernier UVA 498 µW/cm²
Gröbel UVA 632 µW/cm²
Gröbel UVB 69.7 µW/cm²
Gröbel UVC -0.0407 µW/cm²
Solarmeter 6.4 (D3) 24.4 IU/min
UVX-31 371 µW/cm²
IL UVB 0.0814 µW/cm²
IL UVA 569 µW/cm²
Solarmeter 6.5 (UVI, post 2010) 6.34 UV-Index
Solarmeter 6.2 (UVB, post 2010) 123 µW/cm² (Solarmeter Ratio = 19.3)
Solarmeter AlGaN 6.5 UVI sensor 84.9 UV Index
GenUV 7.1 UV-Index 4.69 UV-Index
Solarmeter 10.0 (Global Power) 43.2 W/m²
Solarmeter 4.0 (UVA) 7.99 mW/cm²
LS122 -0.0514 W/m²
ISM400 26.2 W/m²