Spectrum 759: SW54 Edit
DeleteMeasurement
| Brand |
MegaRay Mac Industries Inc http://www.reptileuv.com/ |
|---|---|
| Lamp Product |
Zone 2 T5 Fluorescent Lamp 24W |
| Lamp ID |
SW54 (04/2023) for lamp test provided by SP Lighting |
| Spectrometer | USB2000+ |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 10 cm |
| Age | 100 hours |
| Originator (measurement) | Sarina Wunderlich |
Database entry created:
Sarina Wunderlich
5/Feb/2024 ; updated:
Sarina Wunderlich
5/Feb/2024
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 (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, 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 ) | ( 0.3 ; 0.45 ) | ( 0.23 ; 0.23 ; 0.34 ) |
| CCT | 8400 Kelvin | 7400 Kelvin | 6800 Kelvin |
| distance | 0.11 | 0.08 | |
| 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.
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
Ranges
total ( 0 nm - 0 nm) 5730 µW/cm² = 57.3 W/m² UVC ( 0 nm - 280 nm) 160 µW/cm² = 1.6 W/m² non-terrestrial ( 0 nm - 290 nm) 163 µW/cm² = 1.63 W/m² total2 ( 250 nm - 880 nm) 5580 µW/cm² = 55.8 W/m² UVB (EU) ( 280 nm - 315 nm) 275 µW/cm² = 2.75 W/m² UVB (US) ( 280 nm - 320 nm) 515 µW/cm² = 5.15 W/m² UVA+B ( 280 nm - 380 nm) 2710 µW/cm² = 27.1 W/m² Solar UVB ( 290 nm - 315 nm) 272 µW/cm² = 2.72 W/m² UVA D3 regulating ( 315 nm - 335 nm) 1120 µW/cm² = 11.2 W/m² UVA (EU) ( 315 nm - 380 nm) 2430 µW/cm² = 24.3 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 1190 µW/cm² = 11.9 W/m² UVA (US) ( 320 nm - 380 nm) 2190 µW/cm² = 21.9 W/m² UVA1 (variant) ( 335 nm - 380 nm) 1310 µW/cm² = 13.1 W/m² UVA1 (medical) ( 340 nm - 400 nm) 1040 µW/cm² = 10.4 W/m² vis. UVA ( 350 nm - 380 nm) 459 µW/cm² = 4.59 W/m² VIS Rep3 ( 350 nm - 600 nm) 2640 µW/cm² = 26.4 W/m² VIS Rep4 ( 350 nm - 700 nm) 3190 µW/cm² = 31.9 W/m² purple ( 380 nm - 420 nm) 283 µW/cm² = 2.83 W/m² VIS ( 380 nm - 780 nm) 2840 µW/cm² = 28.4 W/m² VIS2 ( 400 nm - 680 nm) 2630 µW/cm² = 26.3 W/m² PAR ( 400 nm - 700 nm) 2700 µW/cm² = 27 W/m² tmp ( 400 nm - 1100 nm) 2830 µW/cm² = 28.3 W/m² blue ( 420 nm - 490 nm) 839 µW/cm² = 8.39 W/m² green ( 490 nm - 575 nm) 825 µW/cm² = 8.25 W/m² yellow ( 575 nm - 585 nm) 150 µW/cm² = 1.5 W/m² orange ( 585 nm - 650 nm) 398 µW/cm² = 3.98 W/m² red ( 650 nm - 780 nm) 349 µW/cm² = 3.49 W/m² IRA ( 700 nm - 1400 nm) 131 µW/cm² = 1.31 W/m² IR2 ( 720 nm - 1100 nm) 85.6 µW/cm² = 0.856 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 19.6 UV-Index Pyrimidine dimerization of DNA 176 µW/cm² Photoceratitis 28.4 µW/cm² Photoconjunctivitis 28.9 µW/cm² DNA Damage 42.7 Vitamin D3 63 µW/cm² Photosynthesis 1890 µW/cm² Luminosity 7290 lx Human L-Cone 1070 µW/cm² Human M-Cone 951 µW/cm² Human S-Cone 724 µW/cm² CIE X 953 µW/cm² CIE Y 1020 µW/cm² CIE Z 1320 µW/cm² PAR 13300000 mol photons Extinction preD3 828 e-3*m²/mol Extinction Tachysterol 2280 e-3*m²/mol Exctincition PreD3 442000 m²/mol Extinction Lumisterol 252 m²/mol Exctincition Tachysterol 3210000 m²/mol Extinction 7DHC 212 m²/mol L-Cone 878 µW/cm² M-Cone 885 µW/cm² S-Cone 1320 µW/cm² U-Cone 761 µW/cm² UVR - ICNIRP 2004 33.6 Rel Biol Eff Melatonin Supression 963 µW/cm² Blue Light Hazard 834 µW/cm² (114 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 68 µW/cm² Lumen Reptil 8460 "pseudo-lx" Vitamin D3 Degradation 102 µW/cm² Actinic UV 33.5 µW/cm² (45.9 mW/klm) Exctincition Lumisterol 206000 m²/mol Exctincition 7DHC 193000 m²/mol Exctincition Toxisterols 202000 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 662 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 19.5 Leybold UVB 446 µW/cm² Leybold UVA 1570 µW/cm² Leybold UVC 18 µW/cm² DeltaOhm UVB 1300 µW/cm² DeltaOhm UVC 187 µW/cm² Vernier UVB 122 µW/cm² Vernier UVA 1810 µW/cm² Gröbel UVA 2030 µW/cm² Gröbel UVB 207 µW/cm² Gröbel UVC 23.7 µW/cm² Luxmeter 7590 lx Solarmeter 6.4 (D3) 60.9 IU/min UVX-31 1400 µW/cm² IL UVB 0.284 µW/cm² IL UVA 1700 µW/cm² Solarmeter 6.5 (UVI, post 2010) 16.8 UV-Index Solarmeter 6.2 (UVB, post 2010) 466 µW/cm² (Solarmeter Ratio = 27.7) Solarmeter AlGaN 6.5 UVI sensor 243 UV Index GenUV 7.1 UV-Index 15.3 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 39.7 W/m² Solarmeter 4.0 (UVA) 21.4 mW/cm² LS122 (manuf.) 0.0206 W/m² ISM400 (first guess) 20.7 W/m² LS122 (assumption) 0.939 W/m² ISM400_new 16.5 W/m² Solarmeter 10.0 (Global Power) (assumption) 31.8 W/m²