Directly under UVB LED
Spectrum 639: TG-RZ-MDLED-T-18W-001 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-001 (12/2022) Reptizoo Dimming Modular LED UVB Light Hood Tropical 12W |
| Spectrometer | FLAME UV-Vis (E) |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 15 cm |
| Age | 50 hours |
| Originator (measurement) | Thomas Griffiths |
Database entry created:
Thomas Griffiths (Tomaskas Ltd.)
22/Dec/2022 ; updated:
Thomas Griffiths (Tomaskas Ltd.)
22/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 | ( 0.31 ; 0.31 ) | ( 0.35 ; 0.63 ) | ( 0.31 ; 0.24 ; 0.43 ) |
| CCT | 7100 Kelvin | 6000 Kelvin | 4800 Kelvin |
| distance | 0.28 | 0.2 | |
| 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) 1020 µW/cm² = 10.2 W/m² UVC ( 0 nm - 280 nm) 0 µW/cm² = 0 W/m² non-terrestrial ( 0 nm - 290 nm) 0.467 µW/cm² = 0.00467 W/m² total2 ( 250 nm - 880 nm) 1020 µW/cm² = 10.2 W/m² UVB (EU) ( 280 nm - 315 nm) 40.6 µW/cm² = 0.406 W/m² UVB (US) ( 280 nm - 320 nm) 43.1 µW/cm² = 0.431 W/m² UVA+B ( 280 nm - 380 nm) 46.4 µW/cm² = 0.464 W/m² Solar UVB ( 290 nm - 315 nm) 40.2 µW/cm² = 0.402 W/m² UVA D3 regulating ( 315 nm - 335 nm) 4.56 µW/cm² = 0.0456 W/m² UVA (EU) ( 315 nm - 380 nm) 5.79 µW/cm² = 0.0579 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 2.31 µW/cm² = 0.0231 W/m² UVA (US) ( 320 nm - 380 nm) 3.31 µW/cm² = 0.0331 W/m² UVA1 (variant) ( 335 nm - 380 nm) 1.24 µW/cm² = 0.0124 W/m² UVA1 (medical) ( 340 nm - 400 nm) 1.53 µW/cm² = 0.0153 W/m² vis. UVA ( 350 nm - 380 nm) 0.659 µW/cm² = 0.00659 W/m² VIS Rep3 ( 350 nm - 600 nm) 783 µW/cm² = 7.83 W/m² VIS Rep4 ( 350 nm - 700 nm) 951 µW/cm² = 9.51 W/m² purple ( 380 nm - 420 nm) 7.31 µW/cm² = 0.0731 W/m² VIS ( 380 nm - 780 nm) 963 µW/cm² = 9.63 W/m² VIS2 ( 400 nm - 680 nm) 939 µW/cm² = 9.39 W/m² PAR ( 400 nm - 700 nm) 950 µW/cm² = 9.5 W/m² tmp ( 400 nm - 1100 nm) 971 µW/cm² = 9.71 W/m² blue ( 420 nm - 490 nm) 317 µW/cm² = 3.17 W/m² green ( 490 nm - 575 nm) 350 µW/cm² = 3.5 W/m² yellow ( 575 nm - 585 nm) 46.5 µW/cm² = 0.465 W/m² orange ( 585 nm - 650 nm) 189 µW/cm² = 1.89 W/m² red ( 650 nm - 780 nm) 53 µW/cm² = 0.53 W/m² IRA ( 700 nm - 1400 nm) 21.1 µW/cm² = 0.211 W/m² IR2 ( 720 nm - 1100 nm) 15.2 µW/cm² = 0.152 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 6.01 UV-Index Pyrimidine dimerization of DNA 28.8 µW/cm² Photoceratitis 8.58 µW/cm² Photoconjunctivitis 0.319 µW/cm² DNA Damage 1.08 Vitamin D3 23 µW/cm² Photosynthesis 650 µW/cm² Luminosity 3150 lx Human L-Cone 466 µW/cm² Human M-Cone 400 µW/cm² Human S-Cone 292 µW/cm² CIE X 428 µW/cm² CIE Y 440 µW/cm² CIE Z 534 µW/cm² PAR 4200000 mol photons Extinction preD3 82.8 e-3*m²/mol Extinction Tachysterol 288 e-3*m²/mol Exctincition PreD3 40800 m²/mol Extinction Lumisterol 35.8 m²/mol Exctincition Tachysterol 364000 m²/mol Extinction 7DHC 39.5 m²/mol L-Cone 387 µW/cm² M-Cone 294 µW/cm² S-Cone 529 µW/cm² U-Cone 22.5 µW/cm² UVR - ICNIRP 2004 6.36 Rel Biol Eff Melatonin Supression 325 µW/cm² Blue Light Hazard 311 µW/cm² (98.9 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 25.4 µW/cm² Lumen Reptil 2870 "pseudo-lx" Vitamin D3 Degradation 11.3 µW/cm² Actinic UV 6.24 µW/cm² (19.8 mW/klm) Exctincition Lumisterol 43500 m²/mol Exctincition 7DHC 48800 m²/mol Exctincition Toxisterols 3730 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 49.1 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 6.53 Leybold UVB 39.7 µW/cm² Leybold UVA 1.72 µW/cm² Leybold UVC 0.0196 µW/cm² DeltaOhm UVB 36.5 µW/cm² DeltaOhm UVC 7.54 µW/cm² Vernier UVB 28.2 µW/cm² Vernier UVA 9.39 µW/cm² Gröbel UVA 7.24 µW/cm² Gröbel UVB 31.5 µW/cm² Gröbel UVC 0.00847 µW/cm² Luxmeter 3280 lx Solarmeter 6.4 (D3) 20.4 IU/min UVX-31 42 µW/cm² IL UVB 0.0227 µW/cm² IL UVA 3.45 µW/cm² Solarmeter 6.5 (UVI, post 2010) 4.68 UV-Index Solarmeter 6.2 (UVB, post 2010) 23.5 µW/cm² (Solarmeter Ratio = 5.01) Solarmeter AlGaN 6.5 UVI sensor 37.3 UV Index GenUV 7.1 UV-Index 1.76 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 10 W/m² Solarmeter 4.0 (UVA) 0.0655 mW/cm² LS122 (manuf.) 0.0235 W/m² ISM400 (first guess) 6.62 W/m² LS122 (assumption) 0.351 W/m² ISM400_new 5.27 W/m² Solarmeter 10.0 (Global Power) (assumption) 9.54 W/m²