UVB Diode close up and isolated
Spectrum 640: TG-RZ-MDLED-T-18W-002 Edit
DeleteMeasurement
| Brand |
Repti-Zoo Brand by Dongguan ETAN Pet Supplies Co., Ltd., located in China. http://www.repti-zoo.com/en/index.php. |
|---|---|
| Lamp Product |
Reptizoo Dimming Modular LED UVB Light Hood Tropical 18W Reptizoo Dimming Modular LED UVB Light Hood Tropical 18W |
| Lamp ID |
TG-RZ-MDLED-T-18W-002 (12/2022) |
| Spectrometer | FLAME UV-Vis (E) |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 2 cm |
| Age | 50 hours |
| Originator (measurement) | Thomas Griffiths |
Database entry created:
Thomas Griffiths (Tomaskas Ltd.)
29/Dec/2022 ; updated:
Thomas Griffiths (Tomaskas Ltd.)
29/Dec/2022
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 | ( 0.23 ; 0.27 ) | ( 0.18 ; 0.25 ) | ( 0.091 ; 0.16 ; 0.23 ) |
| CCT | 29000 Kelvin | 0 Kelvin | 0 Kelvin |
| distance | 0 | 0 | |
| 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) 4900 µW/cm² = 49 W/m² UVC ( 0 nm - 280 nm) 19.9 µW/cm² = 0.199 W/m² non-terrestrial ( 0 nm - 290 nm) 56.8 µW/cm² = 0.568 W/m² total2 ( 250 nm - 880 nm) 4900 µW/cm² = 49 W/m² UVB (EU) ( 280 nm - 315 nm) 4360 µW/cm² = 43.6 W/m² UVB (US) ( 280 nm - 320 nm) 4620 µW/cm² = 46.2 W/m² UVA+B ( 280 nm - 380 nm) 4850 µW/cm² = 48.5 W/m² Solar UVB ( 290 nm - 315 nm) 4320 µW/cm² = 43.2 W/m² UVA D3 regulating ( 315 nm - 335 nm) 450 µW/cm² = 4.5 W/m² UVA (EU) ( 315 nm - 380 nm) 493 µW/cm² = 4.93 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 205 µW/cm² = 2.05 W/m² UVA (US) ( 320 nm - 380 nm) 233 µW/cm² = 2.33 W/m² UVA1 (variant) ( 335 nm - 380 nm) 42.7 µW/cm² = 0.427 W/m² UVA1 (medical) ( 340 nm - 400 nm) 31 µW/cm² = 0.31 W/m² vis. UVA ( 350 nm - 380 nm) 13.2 µW/cm² = 0.132 W/m² VIS Rep3 ( 350 nm - 600 nm) 28.3 µW/cm² = 0.283 W/m² VIS Rep4 ( 350 nm - 700 nm) 29.3 µW/cm² = 0.293 W/m² purple ( 380 nm - 420 nm) 4.59 µW/cm² = 0.0459 W/m² VIS ( 380 nm - 780 nm) 16.8 µW/cm² = 0.168 W/m² VIS2 ( 400 nm - 680 nm) 13.3 µW/cm² = 0.133 W/m² PAR ( 400 nm - 700 nm) 13.4 µW/cm² = 0.134 W/m² tmp ( 400 nm - 1100 nm) 22.1 µW/cm² = 0.221 W/m² blue ( 420 nm - 490 nm) 5.38 µW/cm² = 0.0538 W/m² green ( 490 nm - 575 nm) 4.55 µW/cm² = 0.0455 W/m² yellow ( 575 nm - 585 nm) 0.311 µW/cm² = 0.00311 W/m² orange ( 585 nm - 650 nm) 0.964 µW/cm² = 0.00964 W/m² red ( 650 nm - 780 nm) 1.01 µW/cm² = 0.0101 W/m² IRA ( 700 nm - 1400 nm) 8.68 µW/cm² = 0.0868 W/m² IR2 ( 720 nm - 1100 nm) 8.58 µW/cm² = 0.0858 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 656 UV-Index Pyrimidine dimerization of DNA 3100 µW/cm² Photoceratitis 922 µW/cm² Photoconjunctivitis 47.6 µW/cm² DNA Damage 129 Vitamin D3 2490 µW/cm² Photosynthesis 9.75 µW/cm² Luminosity 32.5 lx Human L-Cone 4.54 µW/cm² Human M-Cone 4.68 µW/cm² Human S-Cone 4.65 µW/cm² CIE X 3.73 µW/cm² CIE Y 4.5 µW/cm² CIE Z 8.36 µW/cm² PAR 60500 mol photons Extinction preD3 9020 e-3*m²/mol Extinction Tachysterol 31200 e-3*m²/mol Exctincition PreD3 4510000 m²/mol Extinction Lumisterol 3980 m²/mol Exctincition Tachysterol 39500000 m²/mol Extinction 7DHC 4420 m²/mol L-Cone 3.35 µW/cm² M-Cone 6.06 µW/cm² S-Cone 8.47 µW/cm² U-Cone 18.9 µW/cm² UVR - ICNIRP 2004 701 Rel Biol Eff Melatonin Supression 6.52 µW/cm² Blue Light Hazard 44.7 µW/cm² (1380 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 2740 µW/cm² Lumen Reptil 67.1 "pseudo-lx" Vitamin D3 Degradation 1220 µW/cm² Actinic UV 687 µW/cm² (211000 mW/klm) Exctincition Lumisterol 4810000 m²/mol Exctincition 7DHC 5430000 m²/mol Exctincition Toxisterols 434000 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 5280 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 705 Leybold UVB 4260 µW/cm² Leybold UVA 93.9 µW/cm² Leybold UVC 12.9 µW/cm² DeltaOhm UVB 3880 µW/cm² DeltaOhm UVC 817 µW/cm² Vernier UVB 3030 µW/cm² Vernier UVA 930 µW/cm² Gröbel UVA 672 µW/cm² Gröbel UVB 3390 µW/cm² Gröbel UVC 13.8 µW/cm² Luxmeter 35.1 lx Solarmeter 6.4 (D3) 2200 IU/min UVX-31 4470 µW/cm² IL UVB 2.44 µW/cm² IL UVA 268 µW/cm² Solarmeter 6.5 (UVI, post 2010) 505 UV-Index Solarmeter 6.2 (UVB, post 2010) 2520 µW/cm² (Solarmeter Ratio = 4.98) Solarmeter AlGaN 6.5 UVI sensor 4010 UV Index GenUV 7.1 UV-Index 189 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 16.4 W/m² Solarmeter 4.0 (UVA) 5.41 mW/cm² LS122 (manuf.) 0.0272 W/m² ISM400 (first guess) 0.579 W/m² LS122 (assumption) 0.0243 W/m² ISM400_new 0.42 W/m² Solarmeter 10.0 (Global Power) (assumption) 5.6 W/m²