Spectrum #851 SW120 (Arcadia Arcadia D3 Desert 12% UVB T5HO 24W) Edit
Delete(1) Raw Measurement
| Lampid | SW120 |
|---|---|
| Spectrometer | USB2000+ |
| Originator | Sarina Wunderlich |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | Arcadia ProT5 HO T5 UV-B Lighting Kit |
| Distance | 20 |
| Age | 1 |
created by Sarina Wunderlich, 30.05.2026; last updated by , 30.05.2026
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 | ( 0.29 ; 0.31 ) | ( 0.42 ; 0.44 ) | ( 0.25 ; 0.31 ; 0.33 ) |
| CCT | 8500 Kelvin | 4800 Kelvin | 5600 Kelvin |
| distance | 0.1 | 0.093 | |
| 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) 2620 µW/cm² = 26.2 W/m² UVC ( 0 nm - 280 nm) 3.49 µW/cm² = 0.0349 W/m² non-terrestrial ( 0 nm - 290 nm) 4.99 µW/cm² = 0.0499 W/m² total2 ( 250 nm - 880 nm) 2620 µW/cm² = 26.2 W/m² UVB (EU) ( 280 nm - 315 nm) 141 µW/cm² = 1.41 W/m² UVB (US) ( 280 nm - 320 nm) 224 µW/cm² = 2.24 W/m² UVA+B ( 280 nm - 380 nm) 789 µW/cm² = 7.89 W/m² Solar UVB ( 290 nm - 315 nm) 140 µW/cm² = 1.4 W/m² UVA D3 regulating ( 315 nm - 335 nm) 325 µW/cm² = 3.25 W/m² UVA (EU) ( 315 nm - 380 nm) 648 µW/cm² = 6.48 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 317 µW/cm² = 3.17 W/m² UVA (US) ( 320 nm - 380 nm) 564 µW/cm² = 5.64 W/m² UVA1 (variant) ( 335 nm - 380 nm) 323 µW/cm² = 3.23 W/m² UVA1 (medical) ( 340 nm - 400 nm) 260 µW/cm² = 2.6 W/m² vis. UVA ( 350 nm - 380 nm) 121 µW/cm² = 1.21 W/m² VIS Rep3 ( 350 nm - 600 nm) 1610 µW/cm² = 16.1 W/m² VIS Rep4 ( 350 nm - 700 nm) 1910 µW/cm² = 19.1 W/m² purple ( 380 nm - 420 nm) 112 µW/cm² = 1.12 W/m² VIS ( 380 nm - 780 nm) 1820 µW/cm² = 18.2 W/m² VIS2 ( 400 nm - 680 nm) 1770 µW/cm² = 17.7 W/m² PAR ( 400 nm - 700 nm) 1780 µW/cm² = 17.8 W/m² tmp ( 400 nm - 1100 nm) 1810 µW/cm² = 18.1 W/m² blue ( 420 nm - 490 nm) 640 µW/cm² = 6.4 W/m² green ( 490 nm - 575 nm) 612 µW/cm² = 6.12 W/m² yellow ( 575 nm - 585 nm) 68.7 µW/cm² = 0.687 W/m² orange ( 585 nm - 650 nm) 325 µW/cm² = 3.25 W/m² red ( 650 nm - 780 nm) 63.7 µW/cm² = 0.637 W/m² IR2 ( 655 nm - 685 nm) 18.4 µW/cm² = 0.184 W/m² IRA ( 700 nm - 1400 nm) 34.1 µW/cm² = 0.341 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
(5b) Actionspectra
Erythema 10.6 UV-Index Pyrimidine dimerization of DNA 88.2 µW/cm² Photoceratitis 15.8 µW/cm² Photoconjunctivitis 3.36 µW/cm² DNA Damage 4.61 Vitamin D3 39.8 µW/cm² Photosynthesis 1240 µW/cm² Luminosity 5310 lx Human L-Cone 775 µW/cm² Human M-Cone 696 µW/cm² Human S-Cone 505 µW/cm² CIE X 679 µW/cm² CIE Y 735 µW/cm² CIE Z 955 µW/cm² PAR PPFD 82.5 µmol/m²/s Extinction preD3 280 e-3*m²/mol Extinction Tachysterol 945 e-3*m²/mol Exctincition PreD3 148000 m²/mol Extinction Lumisterol 69.8 m²/mol Exctincition Tachysterol 1310000 m²/mol Extinction 7DHC 72.7 m²/mol L-Cone 620 µW/cm² M-Cone 787 µW/cm² S-Cone 833 µW/cm² U-Cone 265 µW/cm² UVR - ICNIRP 2004 10.7 Rel Biol Eff Melatonin Supression 725 µW/cm² Blue Light Hazard 560 µW/cm² (106 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 43.8 µW/cm² Lumen Reptil 5760 "pseudo-lx" Vitamin D3 Degradation 45.1 µW/cm² Actinic UV 10.6 µW/cm² (20 mW/klm) Exctincition Lumisterol 89000 m²/mol Exctincition 7DHC 84400 m²/mol Exctincition Toxisterols 30800 m²/mol UV-Index2 8.87 UV-Index (285-400nm)
(5c) Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 268 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 11.7 Leybold UVB 191 µW/cm² Leybold UVA 391 µW/cm² Leybold UVC 2.37 µW/cm² DeltaOhm UVB 425 µW/cm² DeltaOhm UVC 56.2 µW/cm² Vernier UVB 69.1 µW/cm² Vernier UVA 498 µW/cm² Gröbel UVA 539 µW/cm² Gröbel UVB 99.5 µW/cm² Gröbel UVC 2.62 µW/cm² Luxmeter 5500 lx Solarmeter 6.4 (D3) 36.7 IU/min UVX-31 456 µW/cm² IL UVB 0.111 µW/cm² IL UVA 438 µW/cm² Solarmeter 6.5 (UVI, post 2010) 9.6 UV-Index Solarmeter 6.2 (UVB, post 2010) 175 µW/cm² (Solarmeter Ratio = 18.2) Solarmeter AlGaN 6.5 UVI sensor 123 UV Index GenUV 7.1 UV-Index 6.88 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 20.9 W/m² Solarmeter 4.0 (UVA) 5.68 mW/cm² LS122 (manuf.) 0.00171 W/m² ISM400 (first guess) 11.5 W/m² LS122 (assumption) 0.515 W/m² ISM400_new 8.78 W/m² Solarmeter 10.0 (Global Power) (assumption) 18.1 W/m²
(5d) Summary of my favourites
| UVC (0nm -280nm) [µW/cm] | 3.49 | 0.133 % |
| non-terrestrial (0nm -290nm) [µW/cm] | 4.99 | 0.191 % |
| UVB (EU) (280nm -315nm) [µW/cm] | 141 | 5.39 % |
| UVB (US) (280nm -320nm) [µW/cm] | 224 | 8.57 % |
| Solar UVB (290nm -315nm) [µW/cm] | 140 | 5.34 % |
| UVA (EU) (315nm -380nm) [µW/cm] | 648 | 24.7 % |
| UVA (US) (320nm -380nm) [µW/cm] | 564 | 21.6 % |
| UVA2 (medical definition) (320nm -340nm) [µW/cm] | 317 | 12.1 % |
| UVA1 (medical) (340nm -400nm) [µW/cm] | 260 | 9.94 % |
| UVA D3 regulating (315nm -335nm) [µW/cm] | 325 | 12.4 % |
| vis. UVA (350nm -380nm) [µW/cm] | 121 | 4.61 % |
| VIS (380nm -780nm) [µW/cm] | 1820 | 69.6 % |
| blue (420nm -490nm) [µW/cm] | 640 | 24.4 % |
| total2 (250nm -880nm) [µW/cm] | 2620 | 100 % |
| UV-Index2 [UV-Index] | 8.87 | |
| Luminosity [lx] | 5310 | |
| Blue Light Hazard [µW/cm²] | 560 | 106µW/cm/1000lx |
| Solarmeter 6.5 (UVI, post 2010) [UV-Index] | 9.6 | |
| Solarmeter 6.2 (UVB, post 2010) [µW/cm²] | 175 | |
| Actinic UV [µW/cm²] | 10.6 | 9.09 at UVI7.6 |
| Vitamin D3 [µW/cm²] | 39.8 | 34.1 at UVI7.6 |