Spectrum 761: SW56 Edit
DeleteMeasurement
| Brand |
MegaRay Mac Industries Inc http://www.reptileuv.com/ |
|---|---|
| Lamp Product |
Zone 2 T5 Fluorescent Lamp 24W |
| Lamp ID |
SW56 (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 ; 0.44 ) | ( 0.23 ; 0.23 ; 0.34 ) |
| CCT | 8300 Kelvin | 7400 Kelvin | 6800 Kelvin |
| distance | 0.1 | 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) 5490 µW/cm² = 54.9 W/m² UVC ( 0 nm - 280 nm) 220 µW/cm² = 2.2 W/m² non-terrestrial ( 0 nm - 290 nm) 223 µW/cm² = 2.23 W/m² total2 ( 250 nm - 880 nm) 5280 µW/cm² = 52.8 W/m² UVB (EU) ( 280 nm - 315 nm) 256 µW/cm² = 2.56 W/m² UVB (US) ( 280 nm - 320 nm) 480 µW/cm² = 4.8 W/m² UVA+B ( 280 nm - 380 nm) 2550 µW/cm² = 25.5 W/m² Solar UVB ( 290 nm - 315 nm) 254 µW/cm² = 2.54 W/m² UVA D3 regulating ( 315 nm - 335 nm) 1050 µW/cm² = 10.5 W/m² UVA (EU) ( 315 nm - 380 nm) 2290 µW/cm² = 22.9 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 1120 µW/cm² = 11.2 W/m² UVA (US) ( 320 nm - 380 nm) 2070 µW/cm² = 20.7 W/m² UVA1 (variant) ( 335 nm - 380 nm) 1240 µW/cm² = 12.4 W/m² UVA1 (medical) ( 340 nm - 400 nm) 982 µW/cm² = 9.82 W/m² vis. UVA ( 350 nm - 380 nm) 437 µW/cm² = 4.37 W/m² VIS Rep3 ( 350 nm - 600 nm) 2520 µW/cm² = 25.2 W/m² VIS Rep4 ( 350 nm - 700 nm) 3040 µW/cm² = 30.4 W/m² purple ( 380 nm - 420 nm) 274 µW/cm² = 2.74 W/m² VIS ( 380 nm - 780 nm) 2710 µW/cm² = 27.1 W/m² VIS2 ( 400 nm - 680 nm) 2500 µW/cm² = 25 W/m² PAR ( 400 nm - 700 nm) 2570 µW/cm² = 25.7 W/m² tmp ( 400 nm - 1100 nm) 2690 µW/cm² = 26.9 W/m² blue ( 420 nm - 490 nm) 791 µW/cm² = 7.91 W/m² green ( 490 nm - 575 nm) 789 µW/cm² = 7.89 W/m² yellow ( 575 nm - 585 nm) 145 µW/cm² = 1.45 W/m² orange ( 585 nm - 650 nm) 376 µW/cm² = 3.76 W/m² red ( 650 nm - 780 nm) 331 µW/cm² = 3.31 W/m² IRA ( 700 nm - 1400 nm) 123 µW/cm² = 1.23 W/m² IR2 ( 720 nm - 1100 nm) 79.9 µW/cm² = 0.799 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 18.4 UV-Index Pyrimidine dimerization of DNA 164 µW/cm² Photoceratitis 26.9 µW/cm² Photoconjunctivitis 32.3 µW/cm² DNA Damage 49.7 Vitamin D3 59 µW/cm² Photosynthesis 1800 µW/cm² Luminosity 6980 lx Human L-Cone 1020 µW/cm² Human M-Cone 911 µW/cm² Human S-Cone 685 µW/cm² CIE X 908 µW/cm² CIE Y 972 µW/cm² CIE Z 1250 µW/cm² PAR 12700000 mol photons Extinction preD3 834 e-3*m²/mol Extinction Tachysterol 2170 e-3*m²/mol Exctincition PreD3 440000 m²/mol Extinction Lumisterol 264 m²/mol Exctincition Tachysterol 3030000 m²/mol Extinction 7DHC 215 m²/mol L-Cone 840 µW/cm² M-Cone 835 µW/cm² S-Cone 1250 µW/cm² U-Cone 730 µW/cm² UVR - ICNIRP 2004 37.5 Rel Biol Eff Melatonin Supression 912 µW/cm² Blue Light Hazard 790 µW/cm² (113 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 63.6 µW/cm² Lumen Reptil 8050 "pseudo-lx" Vitamin D3 Degradation 95.8 µW/cm² Actinic UV 37.3 µW/cm² (53.5 mW/klm) Exctincition Lumisterol 200000 m²/mol Exctincition 7DHC 188000 m²/mol Exctincition Toxisterols 225000 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 618 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 18.4 Leybold UVB 416 µW/cm² Leybold UVA 1480 µW/cm² Leybold UVC 20.2 µW/cm² DeltaOhm UVB 1220 µW/cm² DeltaOhm UVC 190 µW/cm² Vernier UVB 113 µW/cm² Vernier UVA 1710 µW/cm² Gröbel UVA 1920 µW/cm² Gröbel UVB 193 µW/cm² Gröbel UVC 28.3 µW/cm² Luxmeter 7270 lx Solarmeter 6.4 (D3) 57.4 IU/min UVX-31 1310 µW/cm² IL UVB 0.265 µW/cm² IL UVA 1610 µW/cm² Solarmeter 6.5 (UVI, post 2010) 15.7 UV-Index Solarmeter 6.2 (UVB, post 2010) 435 µW/cm² (Solarmeter Ratio = 27.7) Solarmeter AlGaN 6.5 UVI sensor 226 UV Index GenUV 7.1 UV-Index 14.4 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 37.7 W/m² Solarmeter 4.0 (UVA) 20.2 mW/cm² LS122 (manuf.) 0.0129 W/m² ISM400 (first guess) 19.7 W/m² LS122 (assumption) 0.89 W/m² ISM400_new 15.7 W/m² Solarmeter 10.0 (Global Power) (assumption) 30.2 W/m²