Reptile Lamp Database

Spectrum 135: SW-BB7500 Edit
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Full Spectrum

7500 Kelvin

Measurement

Brand other
other
Lamp Product Black Body Radiation
Black Body Radiation I(lambda in meters) prop.to 1/lambda^5/(exp(0.014388/lambda/KELVIN)-1)
Lamp ID SW-BB7500 (03/2010)
Spectrometer -
Ballast - no ballast or default/unknown ballast -
Reflector
Distance 0 cm
Age 0 hours
Originator (measurement) Sarina Wunderlich
Database entry created: Sarina Wunderlich 12/Mar/2010 ; updated: Sarina Wunderlich 5/May/2021

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 ( 0.3 ; 0.31 ) ( 0.31 ; 0.34 ) ( 0.2 ; 0.24 ; 0.27 )
CCT 7500 Kelvin 7500 Kelvin 7500 Kelvin
distance 0.0002 0.00047
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) 143000 µW/cm² = 1430 W/m²
UVC ( 0 nm - 280 nm) 11900 µW/cm² = 119 W/m²
non-terrestrial ( 0 nm - 290 nm) 13800 µW/cm² = 138 W/m²
total2 ( 250 nm - 880 nm) 105000 µW/cm² = 1050 W/m²
UVB (EU) ( 280 nm - 315 nm) 7080 µW/cm² = 70.8 W/m²
UVB (US) ( 280 nm - 320 nm) 8180 µW/cm² = 81.8 W/m²
UVA+B ( 280 nm - 380 nm) 22400 µW/cm² = 224 W/m²
Solar UVB ( 290 nm - 315 nm) 5190 µW/cm² = 51.9 W/m²
UVA D3 regulating ( 315 nm - 335 nm) 4510 µW/cm² = 45.1 W/m²
UVA (EU) ( 315 nm - 380 nm) 15300 µW/cm² = 153 W/m²
UVA2 (medical definition) ( 320 nm - 340 nm) 4570 µW/cm² = 45.7 W/m²
UVA (US) ( 320 nm - 380 nm) 14200 µW/cm² = 142 W/m²
UVA1 (variant) ( 335 nm - 380 nm) 10800 µW/cm² = 108 W/m²
UVA1 (medical) ( 340 nm - 400 nm) 14500 µW/cm² = 145 W/m²
vis. UVA ( 350 nm - 380 nm) 7240 µW/cm² = 72.4 W/m²
VIS Rep3 ( 350 nm - 600 nm) 53800 µW/cm² = 538 W/m²
VIS Rep4 ( 350 nm - 700 nm) 68100 µW/cm² = 681 W/m²
purple ( 380 nm - 420 nm) 9710 µW/cm² = 97.1 W/m²
VIS ( 380 nm - 780 nm) 69600 µW/cm² = 696 W/m²
PAR ( 400 nm - 700 nm) 56000 µW/cm² = 560 W/m²
blue ( 420 nm - 490 nm) 16000 µW/cm² = 160 W/m²
green ( 490 nm - 575 nm) 16600 µW/cm² = 166 W/m²
yellow ( 575 nm - 585 nm) 1730 µW/cm² = 17.3 W/m²
orange ( 585 nm - 650 nm) 10200 µW/cm² = 102 W/m²
red ( 650 nm - 780 nm) 15400 µW/cm² = 154 W/m²
IRA ( 700 nm - 1400 nm) 37300 µW/cm² = 373 W/m²
IRB ( 1400 nm - 3000 nm) 9460 µW/cm² = 94.6 W/m²
Actionspectra
Erythema 3750 UV-Index
Pyrimidine dimerization of DNA 3460 µW/cm²
Photoceratitis 4610 µW/cm²
Photoconjunctivitis 6730 µW/cm²
DNA Damage 9070
Vitamin D3 5440 µW/cm²
Photosynthesis 40300 µW/cm²
Luminosity 141000 lx
Human L-Cone 20900 µW/cm²
Human M-Cone 18100 µW/cm²
Human S-Cone 13500 µW/cm²
CIE X 18900 µW/cm²
CIE Y 19500 µW/cm²
CIE Z 24500 µW/cm²
PAR 262000000 mol photons
Extinction preD3 84600 e-3*m²/mol
Extinction Tachysterol 182000 e-3*m²/mol
Exctincition PreD3 71800000 m²/mol
Extinction Lumisterol 63500 m²/mol
Exctincition Tachysterol 222000000 m²/mol
Extinction 7DHC 72300 m²/mol
L-Cone 17400 µW/cm²
M-Cone 21000 µW/cm²
S-Cone 23400 µW/cm²
U-Cone 24300 µW/cm²
UVR - ICNIRP 2004 7560 Rel Biol Eff
Melatonin Supression 19800 µW/cm²
Blue Light Hazard 15900 µW/cm² (113 µW/cm² per 1000 lx)
CIE 174:2006 PreVit D3 5520 µW/cm²
Lumen Reptil 184000 "pseudo-lx"
Vitamin D3 Degradation 4250 µW/cm²
Actinic UV 7560 µW/cm² (535 mW/klm)
Exctincition Lumisterol 63600000 m²/mol
Exctincition 7DHC 74600000 m²/mol
Exctincition Toxisterols 40400000 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 16200 µW/cm²
Solarmeter 6.5 (UV-Index, pre 2010) 2070
Leybold UVB 5890 µW/cm²
Leybold UVA 10400 µW/cm²
Leybold UVC 5120 µW/cm²
DeltaOhm UVB 9650 µW/cm²
DeltaOhm UVC 8270 µW/cm²
Vernier UVB 5040 µW/cm²
Vernier UVA 10900 µW/cm²
Gröbel UVA 12700 µW/cm²
Gröbel UVB 6990 µW/cm²
Gröbel UVC 5760 µW/cm²
Solarmeter 6.4 (D3) 6470 IU/min
UVX-31 10600 µW/cm²
IL UVB 6.49 µW/cm²
IL UVA 12200 µW/cm²
Solarmeter 6.5 (UVI, post 2010) 1400 UV-Index
Solarmeter 6.2 (UVB, post 2010) 6440 µW/cm² (Solarmeter Ratio = 4.58)
Solarmeter AlGaN 6.5 UVI sensor 7270 UV Index
GenUV 7.1 UV-Index 563 UV-Index
Solarmeter 10.0 (Global Power) 1160 W/m²
Solarmeter 4.0 (UVA) 190 mW/cm²
LS122 859 W/m²
ISM400 995 W/m²