Spectrum #863 SW133 (Zoo Med Reptisun 5.0 UVB T5 24W) Edit
Delete(1) Raw Measurement
| Lampid | SW133 |
|---|---|
| Spectrometer | USB2000+ |
| 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 ; 0.3 ) | ( 0.26 ; 0.44 ) | ( 0.24 ; 0.2 ; 0.33 ) |
| CCT | 7100 Kelvin | 9200 Kelvin | 7100 Kelvin |
| distance | 0.1 | 0.087 | |
| 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) 7130 µW/cm² = 71.3 W/m² UVC ( 0 nm - 280 nm) 1.4 µW/cm² = 0.014 W/m² non-terrestrial ( 0 nm - 290 nm) 4.03 µW/cm² = 0.0403 W/m² total2 ( 250 nm - 880 nm) 7130 µW/cm² = 71.3 W/m² UVB (EU) ( 280 nm - 315 nm) 258 µW/cm² = 2.58 W/m² UVB (US) ( 280 nm - 320 nm) 409 µW/cm² = 4.09 W/m² UVA+B ( 280 nm - 380 nm) 2560 µW/cm² = 25.6 W/m² Solar UVB ( 290 nm - 315 nm) 255 µW/cm² = 2.55 W/m² UVA D3 regulating ( 315 nm - 335 nm) 699 µW/cm² = 6.99 W/m² UVA (EU) ( 315 nm - 380 nm) 2300 µW/cm² = 23 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 766 µW/cm² = 7.66 W/m² UVA (US) ( 320 nm - 380 nm) 2150 µW/cm² = 21.5 W/m² UVA1 (variant) ( 335 nm - 380 nm) 1600 µW/cm² = 16 W/m² UVA1 (medical) ( 340 nm - 400 nm) 1500 µW/cm² = 15 W/m² vis. UVA ( 350 nm - 380 nm) 900 µW/cm² = 9 W/m² VIS Rep3 ( 350 nm - 600 nm) 4530 µW/cm² = 45.3 W/m² VIS Rep4 ( 350 nm - 700 nm) 5370 µW/cm² = 53.7 W/m² purple ( 380 nm - 420 nm) 430 µW/cm² = 4.3 W/m² VIS ( 380 nm - 780 nm) 4550 µW/cm² = 45.5 W/m² VIS2 ( 400 nm - 680 nm) 4330 µW/cm² = 43.3 W/m² PAR ( 400 nm - 700 nm) 4360 µW/cm² = 43.6 W/m² blue ( 420 nm - 490 nm) 1540 µW/cm² = 15.4 W/m² green ( 490 nm - 575 nm) 1310 µW/cm² = 13.1 W/m² yellow ( 575 nm - 585 nm) 182 µW/cm² = 1.82 W/m² orange ( 585 nm - 650 nm) 915 µW/cm² = 9.15 W/m² tmp ( 600 nm - 1000 nm) 938 µW/cm² = 9.38 W/m² red ( 650 nm - 780 nm) 171 µW/cm² = 1.71 W/m² IR2 ( 655 nm - 685 nm) 54.9 µW/cm² = 0.549 W/m² IRA ( 700 nm - 1400 nm) 89.6 µW/cm² = 0.896 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
(5b) Actionspectra
Erythema 17 UV-Index Pyrimidine dimerization of DNA 156 µW/cm² Photoceratitis 26.5 µW/cm² Photoconjunctivitis 1.78 µW/cm² DNA Damage 3.72 Vitamin D3 67.9 µW/cm² Photosynthesis 3030 µW/cm² Luminosity 13300 lx Human L-Cone 1970 µW/cm² Human M-Cone 1670 µW/cm² Human S-Cone 1280 µW/cm² CIE X 1850 µW/cm² CIE Y 1840 µW/cm² CIE Z 2340 µW/cm² PAR PPFD 205 µmol/m²/s Extinction preD3 465 e-3*m²/mol Extinction Tachysterol 1650 e-3*m²/mol Exctincition PreD3 235000 m²/mol Extinction Lumisterol 91.6 m²/mol Exctincition Tachysterol 2440000 m²/mol Extinction 7DHC 95 m²/mol L-Cone 1630 µW/cm² M-Cone 1350 µW/cm² S-Cone 2300 µW/cm² U-Cone 1610 µW/cm² UVR - ICNIRP 2004 15.7 Rel Biol Eff Melatonin Supression 1630 µW/cm² Blue Light Hazard 1450 µW/cm² (109 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 74 µW/cm² Lumen Reptil 15000 "pseudo-lx" Vitamin D3 Degradation 82.1 µW/cm² Actinic UV 15.6 µW/cm² (11.7 mW/klm) Exctincition Lumisterol 126000 m²/mol Exctincition 7DHC 117000 m²/mol Exctincition Toxisterols 37100 m²/mol UV-Index2 15.9 UV-Index (285-400nm)
(5c) Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 498 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 20.1 Leybold UVB 353 µW/cm² Leybold UVA 1610 µW/cm² Leybold UVC 0.363 µW/cm² DeltaOhm UVB 899 µW/cm² DeltaOhm UVC 104 µW/cm² Vernier UVB 120 µW/cm² Vernier UVA 1500 µW/cm² Gröbel UVA 1970 µW/cm² Gröbel UVB 182 µW/cm² Gröbel UVC 0.741 µW/cm² Luxmeter 13600 lx Solarmeter 6.4 (D3) 62.8 IU/min UVX-31 1020 µW/cm² IL UVB 0.219 µW/cm² IL UVA 1810 µW/cm² Solarmeter 6.5 (UVI, post 2010) 16.2 UV-Index Solarmeter 6.2 (UVB, post 2010) 333 µW/cm² (Solarmeter Ratio = 20.5) Solarmeter AlGaN 6.5 UVI sensor 219 UV Index GenUV 7.1 UV-Index 12.4 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 55 W/m² Solarmeter 4.0 (UVA) 23.4 mW/cm² LS122 (manuf.) 0.0319 W/m² ISM400 (first guess) 29.5 W/m² LS122 (assumption) 1.42 W/m² ISM400_new 22.7 W/m² Solarmeter 10.0 (Global Power) (assumption) 46.4 W/m²
(5d) Summary of my favourites
| UVC (0nm -280nm) [µW/cm] | 1.4 | 0.0196 % |
| non-terrestrial (0nm -290nm) [µW/cm] | 4.03 | 0.0566 % |
| UVB (EU) (280nm -315nm) [µW/cm] | 258 | 3.62 % |
| UVB (US) (280nm -320nm) [µW/cm] | 409 | 5.74 % |
| Solar UVB (290nm -315nm) [µW/cm] | 255 | 3.58 % |
| UVA (EU) (315nm -380nm) [µW/cm] | 2300 | 32.3 % |
| UVA (US) (320nm -380nm) [µW/cm] | 2150 | 30.2 % |
| UVA2 (medical definition) (320nm -340nm) [µW/cm] | 766 | 10.8 % |
| UVA1 (medical) (340nm -400nm) [µW/cm] | 1500 | 21.1 % |
| UVA D3 regulating (315nm -335nm) [µW/cm] | 699 | 9.81 % |
| vis. UVA (350nm -380nm) [µW/cm] | 900 | 12.6 % |
| VIS (380nm -780nm) [µW/cm] | 4550 | 63.8 % |
| blue (420nm -490nm) [µW/cm] | 1540 | 21.6 % |
| total2 (250nm -880nm) [µW/cm] | 7130 | 100 % |
| UV-Index2 [UV-Index] | 15.9 | |
| Luminosity [lx] | 13300 | |
| Blue Light Hazard [µW/cm²] | 1450 | 109µW/cm/1000lx |
| Solarmeter 6.5 (UVI, post 2010) [UV-Index] | 16.2 | |
| Solarmeter 6.2 (UVB, post 2010) [µW/cm²] | 333 | |
| Actinic UV [µW/cm²] | 15.6 | 7.42 at UVI7.6 |
| Vitamin D3 [µW/cm²] | 67.9 | 32.3 at UVI7.6 |