Spectrum #815 SW95 (UVLook UVLook Mini USBC Camera) Edit
Delete(1) Raw Measurement
| Lampid | SW95 |
|---|---|
| Spectrometer | USB2000+ |
| Originator | Sarina Wunderlich |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | - no reflector - |
| Distance | 15 |
| Age | 1 |
created by Sarina Wunderlich, 10.01.2025; last updated by Sarina Wunderlich, 10.02.2025
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 | ( 0.17 ; 0.0058 ) | ( 5.7E-5 ; 0.0065 ) | ( 3.8E-6 ; 5.7E-5 ; 0.0065 ) |
| CCT | 0 Kelvin | 0 Kelvin | 0 Kelvin |
| distance | 0 | 0 | |
| 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) 495 µW/cm² = 4.95 W/m² UVC ( 0 nm - 280 nm) 0 µW/cm² = 0 W/m² non-terrestrial ( 0 nm - 290 nm) 0 µW/cm² = 0 W/m² total2 ( 250 nm - 880 nm) 495 µW/cm² = 4.95 W/m² UVB (EU) ( 280 nm - 315 nm) 0 µW/cm² = 0 W/m² UVB (US) ( 280 nm - 320 nm) 0 µW/cm² = 0 W/m² UVA+B ( 280 nm - 380 nm) 485 µW/cm² = 4.85 W/m² Solar UVB ( 290 nm - 315 nm) 0 µW/cm² = 0 W/m² UVA D3 regulating ( 315 nm - 335 nm) 0.448 µW/cm² = 0.00448 W/m² UVA (EU) ( 315 nm - 380 nm) 485 µW/cm² = 4.85 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 0.734 µW/cm² = 0.00734 W/m² UVA (US) ( 320 nm - 380 nm) 485 µW/cm² = 4.85 W/m² UVA1 (variant) ( 335 nm - 380 nm) 485 µW/cm² = 4.85 W/m² UVA1 (medical) ( 340 nm - 400 nm) 493 µW/cm² = 4.93 W/m² vis. UVA ( 350 nm - 380 nm) 484 µW/cm² = 4.84 W/m² VIS Rep3 ( 350 nm - 600 nm) 493 µW/cm² = 4.93 W/m² VIS Rep4 ( 350 nm - 700 nm) 493 µW/cm² = 4.93 W/m² purple ( 380 nm - 420 nm) 9.01 µW/cm² = 0.0901 W/m² VIS ( 380 nm - 780 nm) 9.51 µW/cm² = 0.0951 W/m² VIS2 ( 400 nm - 680 nm) 0.986 µW/cm² = 0.00986 W/m² PAR ( 400 nm - 700 nm) 0.986 µW/cm² = 0.00986 W/m² tmp ( 400 nm - 1100 nm) 0.986 µW/cm² = 0.00986 W/m² blue ( 420 nm - 490 nm) 0.506 µW/cm² = 0.00506 W/m² green ( 490 nm - 575 nm) 0 µW/cm² = 0 W/m² yellow ( 575 nm - 585 nm) 0 µW/cm² = 0 W/m² orange ( 585 nm - 650 nm) 0 µW/cm² = 0 W/m² red ( 650 nm - 780 nm) 0 µW/cm² = 0 W/m² IR2 ( 655 nm - 685 nm) 0 µW/cm² = 0 W/m² IRA ( 700 nm - 1400 nm) 0 µW/cm² = 0 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
(5b) Actionspectra
Erythema 0.0694 UV-Index Pyrimidine dimerization of DNA 0.0134 µW/cm² Photoceratitis 0 µW/cm² Photoconjunctivitis 0 µW/cm² DNA Damage 0.000298 Vitamin D3 0 µW/cm² Photosynthesis 0.839 µW/cm² Luminosity 0.141 lx Human L-Cone 0.018 µW/cm² Human M-Cone 0.0235 µW/cm² Human S-Cone 0.504 µW/cm² CIE X 0.388 µW/cm² CIE Y 0.013 µW/cm² CIE Z 1.85 µW/cm² PAR PPFD 0.0471 µmol/m²/s Extinction preD3 0.0383 e-3*m²/mol Extinction Tachysterol 0.177 e-3*m²/mol Exctincition PreD3 44.8 m²/mol Extinction Lumisterol 0 m²/mol Exctincition Tachysterol 659 m²/mol Extinction 7DHC 0 m²/mol L-Cone 0.00362 µW/cm² M-Cone 0.0538 µW/cm² S-Cone 6.16 µW/cm² U-Cone 936 µW/cm² UVR - ICNIRP 2004 0.0467 Rel Biol Eff Melatonin Supression 0.582 µW/cm² Blue Light Hazard 5.66 µW/cm² (40200 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 0 µW/cm² Lumen Reptil 1210 "pseudo-lx" Vitamin D3 Degradation 0.00976 µW/cm² Actinic UV 0.0467 µW/cm² (3320 mW/klm) Exctincition Lumisterol 1.09 m²/mol Exctincition 7DHC 0.132 m²/mol Exctincition Toxisterols 20.2 m²/mol
(5c) Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 1.98 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 0.0422 Leybold UVB 0.0445 µW/cm² Leybold UVA 277 µW/cm² Leybold UVC 0 µW/cm² DeltaOhm UVB 0.495 µW/cm² DeltaOhm UVC 0.0324 µW/cm² Vernier UVB 0 µW/cm² Vernier UVA 127 µW/cm² Gröbel UVA 343 µW/cm² Gröbel UVB -0.0253 µW/cm² Gröbel UVC 0 µW/cm² Luxmeter 0.157 lx Solarmeter 6.4 (D3) 0.132 IU/min UVX-31 6.78 µW/cm² IL UVB 0.00134 µW/cm² IL UVA 416 µW/cm² Solarmeter 6.5 (UVI, post 2010) 0.0134 UV-Index Solarmeter 6.2 (UVB, post 2010) 0.17 µW/cm² (Solarmeter Ratio = 12.7) Solarmeter AlGaN 6.5 UVI sensor 0.0823 UV Index GenUV 7.1 UV-Index 0.0833 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 2.41 W/m² Solarmeter 4.0 (UVA) 5.83 mW/cm² LS122 (manuf.) 0 W/m² ISM400 (first guess) 0.447 W/m² LS122 (assumption) 0 W/m² ISM400_new 0.227 W/m² Solarmeter 10.0 (Global Power) (assumption) 1.27 W/m²
(5d) Summary of my favourites
| UVC (0nm -280nm) [µW/cm] | 0 | 0 % |
| non-terrestrial (0nm -290nm) [µW/cm] | 0 | 0 % |
| UVB (EU) (280nm -315nm) [µW/cm] | 0 | 0 % |
| UVB (US) (280nm -320nm) [µW/cm] | 0 | 0 % |
| Solar UVB (290nm -315nm) [µW/cm] | 0 | 0 % |
| UVA (EU) (315nm -380nm) [µW/cm] | 485 | 98.1 % |
| UVA (US) (320nm -380nm) [µW/cm] | 485 | 98.1 % |
| UVA2 (medical definition) (320nm -340nm) [µW/cm] | 0.734 | 0.148 % |
| UVA1 (medical) (340nm -400nm) [µW/cm] | 493 | 99.7 % |
| UVA D3 regulating (315nm -335nm) [µW/cm] | 0.448 | 0.0907 % |
| vis. UVA (350nm -380nm) [µW/cm] | 484 | 97.8 % |
| VIS (380nm -780nm) [µW/cm] | 9.51 | 1.92 % |
| blue (420nm -490nm) [µW/cm] | 0.506 | 0.102 % |
| total2 (250nm -880nm) [µW/cm] | 495 | 100 % |
| Erythema [UV-Index] | 0.0694 | |
| Luminosity [lx] | 0.141 | |
| Blue Light Hazard [µW/cm²] | 5.66 | 40200µW/cm/1000lx |
| Solarmeter 6.5 (UVI, post 2010) [UV-Index] | 0.0134 | |
| Solarmeter 6.2 (UVB, post 2010) [µW/cm²] | 0.17 | |
| Actinic UV [µW/cm²] | 0.0467 | 5.12 at UVI7.6 |
| Vitamin D3 [µW/cm²] | 0 | 0 at UVI7.6 |