Reptile Lamp Database

Spectrum 602: SW30 Edit
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Measurement

Brand Hobby (Dohse)
Dohse Aquaristik KG http://www.dohse-aquaristik.com/
Lamp Product UV Vital LED
Lamp ID SW30 (06/2022)
Spectrometer USB2000+
Ballast - no ballast or default/unknown ballast -
Reflector
Distance 10 cm
Age 10 hours
Originator (measurement) Sarina Wunderlich
Database entry created: Sarina Wunderlich 25/Jul/2022 ; updated: Sarina Wunderlich 25/Sep/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 ; 0.28 ) ( 0.089 ; 0.3 ) ( 0.09 ; 0.081 ; 0.27 )
CCT 9900 Kelvin 0 Kelvin 0 Kelvin
distance 0 0
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) 1820 µW/cm² = 18.2 W/m²
UVC ( 0 nm - 280 nm) 1.42 µW/cm² = 0.0142 W/m²
non-terrestrial ( 0 nm - 290 nm) 31 µW/cm² = 0.31 W/m²
total2 ( 250 nm - 880 nm) 1820 µW/cm² = 18.2 W/m²
UVB (EU) ( 280 nm - 315 nm) 241 µW/cm² = 2.41 W/m²
UVB (US) ( 280 nm - 320 nm) 244 µW/cm² = 2.44 W/m²
UVA+B ( 280 nm - 380 nm) 257 µW/cm² = 2.57 W/m²
Solar UVB ( 290 nm - 315 nm) 211 µW/cm² = 2.11 W/m²
UVA D3 regulating ( 315 nm - 335 nm) 7.55 µW/cm² = 0.0755 W/m²
UVA (EU) ( 315 nm - 380 nm) 16.6 µW/cm² = 0.166 W/m²
UVA2 (medical definition) ( 320 nm - 340 nm) 4.71 µW/cm² = 0.0471 W/m²
UVA (US) ( 320 nm - 380 nm) 13.2 µW/cm² = 0.132 W/m²
UVA1 (variant) ( 335 nm - 380 nm) 9.07 µW/cm² = 0.0907 W/m²
UVA1 (medical) ( 340 nm - 400 nm) 431 µW/cm² = 4.31 W/m²
vis. UVA ( 350 nm - 380 nm) 7.77 µW/cm² = 0.0777 W/m²
VIS Rep3 ( 350 nm - 600 nm) 1450 µW/cm² = 14.5 W/m²
VIS Rep4 ( 350 nm - 700 nm) 1560 µW/cm² = 15.6 W/m²
purple ( 380 nm - 420 nm) 994 µW/cm² = 9.94 W/m²
VIS ( 380 nm - 780 nm) 1560 µW/cm² = 15.6 W/m²
PAR ( 400 nm - 700 nm) 1130 µW/cm² = 11.3 W/m²
blue ( 420 nm - 490 nm) 190 µW/cm² = 1.9 W/m²
green ( 490 nm - 575 nm) 199 µW/cm² = 1.99 W/m²
yellow ( 575 nm - 585 nm) 27 µW/cm² = 0.27 W/m²
orange ( 585 nm - 650 nm) 111 µW/cm² = 1.11 W/m²
red ( 650 nm - 780 nm) 37 µW/cm² = 0.37 W/m²
IRA ( 700 nm - 1400 nm) 16.7 µW/cm² = 0.167 W/m²
IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 76.6 UV-Index
Pyrimidine dimerization of DNA 122 µW/cm²
Photoceratitis 119 µW/cm²
Photoconjunctivitis 9.92 µW/cm²
DNA Damage 29.2
Vitamin D3 205 µW/cm²
Photosynthesis 759 µW/cm²
Luminosity 1850 lx
Human L-Cone 274 µW/cm²
Human M-Cone 236 µW/cm²
Human S-Cone 264 µW/cm²
CIE X 266 µW/cm²
CIE Y 255 µW/cm²
CIE Z 404 µW/cm²
PAR 6860000 mol photons
Extinction preD3 786 e-3*m²/mol
Extinction Tachysterol 3110 e-3*m²/mol
Exctincition PreD3 498000 m²/mol
Extinction Lumisterol 646 m²/mol
Exctincition Tachysterol 4000000 m²/mol
Extinction 7DHC 895 m²/mol
L-Cone 224 µW/cm²
M-Cone 200 µW/cm²
S-Cone 668 µW/cm²
U-Cone 1390 µW/cm²
UVR - ICNIRP 2004 103 Rel Biol Eff
Melatonin Supression 450 µW/cm²
Blue Light Hazard 365 µW/cm² (197 µW/cm² per 1000 lx)
CIE 174:2006 PreVit D3 209 µW/cm²
Lumen Reptil 4970 "pseudo-lx"
Vitamin D3 Degradation 94 µW/cm²
Actinic UV 102 µW/cm² (549 mW/klm)
Exctincition Lumisterol 753000 m²/mol
Exctincition 7DHC 1040000 m²/mol
Exctincition Toxisterols 34500 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 329 µW/cm²
Solarmeter 6.5 (UV-Index, pre 2010) 63.2
Leybold UVB 194 µW/cm²
Leybold UVA 43.9 µW/cm²
Leybold UVC 0.917 µW/cm²
DeltaOhm UVB 185 µW/cm²
DeltaOhm UVC 54.7 µW/cm²
Vernier UVB 165 µW/cm²
Vernier UVA 17.5 µW/cm²
Gröbel UVA 18.7 µW/cm²
Gröbel UVB 225 µW/cm²
Gröbel UVC 1.59 µW/cm²
Solarmeter 6.4 (D3) 197 IU/min
UVX-31 190 µW/cm²
IL UVB 0.165 µW/cm²
IL UVA 26.8 µW/cm²
Solarmeter 6.5 (UVI, post 2010) 37.2 UV-Index
Solarmeter 6.2 (UVB, post 2010) 126 µW/cm² (Solarmeter Ratio = 3.39)
Solarmeter AlGaN 6.5 UVI sensor 215 UV Index
GenUV 7.1 UV-Index 10.9 UV-Index
Solarmeter 10.0 (Global Power) 12.3 W/m²
Solarmeter 4.0 (UVA) 3.43 mW/cm²
LS122 0.0417 W/m²
ISM400 5.53 W/m²