Spectrum #864 SW134 (Zoo Med Reptisun 5.0 UVB T5 24W) Edit
Delete(1) Raw Measurement
| Lampid | SW134 |
|---|---|
| Spectrometer | USB 2000 |
| Originator | Sarina Wunderlich |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | Arcadia ProT5 HO T5 UV-B Lighting Kit |
| Distance | 10 |
| Age | 0.5 |
created by Sarina Wunderlich, 10.10.2026; last updated by , 10.10.2026
Description
(2) Comparison of full spectrum to sunlight
The spectrum is compared to the ASTM spectrum. The measured spectrum is scaled to a lux or UVI value that seems to "make sense" to the database. This can go wrong, depending on the quality and range of the data.
(3) 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.
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 (ASTM spectrum).
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, 338 – 451, 511 – 513 ), 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 ; 0.31 ) | ( 0.26 ; 0.43 ) | ( 0.24 ; 0.2 ; 0.33 ) |
| CCT | 7000 Kelvin | 9000 Kelvin | 6900 Kelvin |
| distance | 0.1 | 0.086 | |
| colour space | 3-D-graph not implemented yet |
(4) 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.
The ratio of the readings of two solarmeters 6.2 (UVB) and 6.5 (UV index) has proven a useful and very simply number to acess the spectral shape in the vitamin-d3-active region.
(5) 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
(5a) Ranges
total ( 0 nm - 0 nm) 6880 µW/cm² = 68.8 W/m² UVC ( 0 nm - 280 nm) 20.9 µW/cm² = 0.209 W/m² non-terrestrial ( 0 nm - 290 nm) 25.7 µW/cm² = 0.257 W/m² total2 ( 250 nm - 880 nm) 6880 µW/cm² = 68.8 W/m² UVB (EU) ( 280 nm - 315 nm) 249 µW/cm² = 2.49 W/m² UVB (US) ( 280 nm - 320 nm) 393 µW/cm² = 3.93 W/m² UVA+B ( 280 nm - 380 nm) 2480 µW/cm² = 24.8 W/m² Solar UVB ( 290 nm - 315 nm) 244 µW/cm² = 2.44 W/m² UVA D3 regulating ( 315 nm - 335 nm) 673 µW/cm² = 6.73 W/m² UVA (EU) ( 315 nm - 380 nm) 2240 µW/cm² = 22.4 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 744 µW/cm² = 7.44 W/m² UVA (US) ( 320 nm - 380 nm) 2090 µW/cm² = 20.9 W/m² UVA1 (variant) ( 335 nm - 380 nm) 1560 µW/cm² = 15.6 W/m² UVA1 (medical) ( 340 nm - 400 nm) 1450 µW/cm² = 14.5 W/m² vis. UVA ( 350 nm - 380 nm) 869 µW/cm² = 8.69 W/m² VIS Rep3 ( 350 nm - 600 nm) 4360 µW/cm² = 43.6 W/m² VIS Rep4 ( 350 nm - 700 nm) 5170 µW/cm² = 51.7 W/m² purple ( 380 nm - 420 nm) 397 µW/cm² = 3.97 W/m² VIS ( 380 nm - 780 nm) 4370 µW/cm² = 43.7 W/m² VIS2 ( 400 nm - 680 nm) 4170 µW/cm² = 41.7 W/m² PAR ( 400 nm - 700 nm) 4200 µW/cm² = 42 W/m² blue ( 420 nm - 490 nm) 1470 µW/cm² = 14.7 W/m² green ( 490 nm - 575 nm) 1280 µW/cm² = 12.8 W/m² yellow ( 575 nm - 585 nm) 181 µW/cm² = 1.81 W/m² orange ( 585 nm - 650 nm) 889 µW/cm² = 8.89 W/m² tmp ( 600 nm - 1000 nm) 890 µW/cm² = 8.9 W/m² red ( 650 nm - 780 nm) 152 µW/cm² = 1.52 W/m² IR2 ( 655 nm - 685 nm) 49 µW/cm² = 0.49 W/m² IRA ( 700 nm - 1400 nm) 74.5 µW/cm² = 0.745 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
(5b) Actionspectra
Erythema 25.3 UV-Index Pyrimidine dimerization of DNA 149 µW/cm² Photoceratitis 32.8 µW/cm² Photoconjunctivitis 19.5 µW/cm² DNA Damage 23.1 Vitamin D3 69.3 µW/cm² Photosynthesis 2900 µW/cm² Luminosity 13000 lx Human L-Cone 1930 µW/cm² Human M-Cone 1640 µW/cm² Human S-Cone 1210 µW/cm² CIE X 1800 µW/cm² CIE Y 1810 µW/cm² CIE Z 2230 µW/cm² PAR PPFD 198 µmol/m²/s Extinction preD3 622 e-3*m²/mol Extinction Tachysterol 1910 e-3*m²/mol Exctincition PreD3 400000 m²/mol Extinction Lumisterol 232 m²/mol Exctincition Tachysterol 2740000 m²/mol Extinction 7DHC 257 m²/mol L-Cone 1590 µW/cm² M-Cone 1310 µW/cm² S-Cone 2170 µW/cm² U-Cone 1510 µW/cm² UVR - ICNIRP 2004 30.9 Rel Biol Eff Melatonin Supression 1550 µW/cm² Blue Light Hazard 1380 µW/cm² (106 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 75 µW/cm² Lumen Reptil 14500 "pseudo-lx" Vitamin D3 Degradation 83 µW/cm² Actinic UV 30.8 µW/cm² (23.7 mW/klm) Exctincition Lumisterol 269000 m²/mol Exctincition 7DHC 279000 m²/mol Exctincition Toxisterols 134000 m²/mol UV-Index2 15.8 UV-Index (285-400nm)
(5c) Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 498 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 21.2 Leybold UVB 338 µW/cm² Leybold UVA 1570 µW/cm² Leybold UVC 16.4 µW/cm² DeltaOhm UVB 868 µW/cm² DeltaOhm UVC 116 µW/cm² Vernier UVB 115 µW/cm² Vernier UVA 1460 µW/cm² Gröbel UVA 1910 µW/cm² Gröbel UVB 179 µW/cm² Gröbel UVC 17 µW/cm² Luxmeter 13300 lx Solarmeter 6.4 (D3) 66.3 IU/min UVX-31 991 µW/cm² IL UVB 0.216 µW/cm² IL UVA 1760 µW/cm² Solarmeter 6.5 (UVI, post 2010) 17.7 UV-Index Solarmeter 6.2 (UVB, post 2010) 324 µW/cm² (Solarmeter Ratio = 18.3) Solarmeter AlGaN 6.5 UVI sensor 214 UV Index GenUV 7.1 UV-Index 12.7 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 53 W/m² Solarmeter 4.0 (UVA) 22.7 mW/cm² LS122 (manuf.) 0.013 W/m² ISM400 (first guess) 28.3 W/m² LS122 (assumption) 1.36 W/m² ISM400_new 21.7 W/m² Solarmeter 10.0 (Global Power) (assumption) 44.7 W/m²
(5d) Summary of my favourites
| UVC (0nm -280nm) [µW/cm] | 20.9 | 0.304 % |
| non-terrestrial (0nm -290nm) [µW/cm] | 25.7 | 0.373 % |
| UVB (EU) (280nm -315nm) [µW/cm] | 249 | 3.62 % |
| UVB (US) (280nm -320nm) [µW/cm] | 393 | 5.7 % |
| Solar UVB (290nm -315nm) [µW/cm] | 244 | 3.55 % |
| UVA (EU) (315nm -380nm) [µW/cm] | 2240 | 32.5 % |
| UVA (US) (320nm -380nm) [µW/cm] | 2090 | 30.4 % |
| UVA2 (medical definition) (320nm -340nm) [µW/cm] | 744 | 10.8 % |
| UVA1 (medical) (340nm -400nm) [µW/cm] | 1450 | 21.1 % |
| UVA D3 regulating (315nm -335nm) [µW/cm] | 673 | 9.78 % |
| vis. UVA (350nm -380nm) [µW/cm] | 869 | 12.6 % |
| VIS (380nm -780nm) [µW/cm] | 4370 | 63.5 % |
| blue (420nm -490nm) [µW/cm] | 1470 | 21.3 % |
| total2 (250nm -880nm) [µW/cm] | 6880 | 100 % |
| UV-Index2 [UV-Index] | 15.8 | |
| Luminosity [lx] | 13000 | |
| Blue Light Hazard [µW/cm²] | 1380 | 106µW/cm/1000lx |
| Solarmeter 6.5 (UVI, post 2010) [UV-Index] | 17.7 | |
| Solarmeter 6.2 (UVB, post 2010) [µW/cm²] | 324 | |
| Actinic UV [µW/cm²] | 30.8 | 14.8 at UVI7.6 |
| Vitamin D3 [µW/cm²] | 69.3 | 33.3 at UVI7.6 |