30cm
Spectrum 801: TG-ACDA-12-001 Edit
DeleteMeasurement
| Brand |
Arcadia UK company https://www.arcadiareptile.com/ |
|---|---|
| Lamp Product |
Arcadia D3 Desert 12% UVB T5HO 24W |
| Lamp ID |
TG-ACDA-12-001 (07/2024) Bought |
| Spectrometer | FLAME UV-Vis (E) |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 30 cm |
| Age | 96 hours |
| Originator (measurement) | Alfred Langer |
Database entry created:
Thomas Griffiths (Tomaskas Ltd.)
8/Jul/2024 ; updated:
Thomas Griffiths (Tomaskas Ltd.)
8/Jul/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.
WARNING: The measurement range (350 - 800 nm) is not sufficient for this evaluation! Data is only available in the range 291.759 - 768.874 nm. Results are shown anyway but should be ignored by anyone except experts.
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 ; 0.33 ) | ( 0.46 ; 0.41 ) | ( 0.26 ; 0.34 ; 0.31 ) |
| CCT | 8000 Kelvin | 4200 Kelvin | 5300 Kelvin |
| distance | 0.08 | 0.095 | |
| 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) 3010 µW/cm² = 30.1 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) 3010 µW/cm² = 30.1 W/m² UVB (EU) ( 280 nm - 315 nm) 156 µW/cm² = 1.56 W/m² UVB (US) ( 280 nm - 320 nm) 251 µW/cm² = 2.51 W/m² UVA+B ( 280 nm - 380 nm) 921 µW/cm² = 9.21 W/m² Solar UVB ( 290 nm - 315 nm) 156 µW/cm² = 1.56 W/m² UVA D3 regulating ( 315 nm - 335 nm) 388 µW/cm² = 3.88 W/m² UVA (EU) ( 315 nm - 380 nm) 765 µW/cm² = 7.65 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 384 µW/cm² = 3.84 W/m² UVA (US) ( 320 nm - 380 nm) 669 µW/cm² = 6.69 W/m² UVA1 (variant) ( 335 nm - 380 nm) 377 µW/cm² = 3.77 W/m² UVA1 (medical) ( 340 nm - 400 nm) 294 µW/cm² = 2.94 W/m² vis. UVA ( 350 nm - 380 nm) 132 µW/cm² = 1.32 W/m² VIS Rep3 ( 350 nm - 600 nm) 1810 µW/cm² = 18.1 W/m² VIS Rep4 ( 350 nm - 700 nm) 2180 µW/cm² = 21.8 W/m² purple ( 380 nm - 420 nm) 102 µW/cm² = 1.02 W/m² VIS ( 380 nm - 780 nm) 2080 µW/cm² = 20.8 W/m² VIS2 ( 400 nm - 680 nm) 2020 µW/cm² = 20.2 W/m² PAR ( 400 nm - 700 nm) 2040 µW/cm² = 20.4 W/m² tmp ( 400 nm - 1100 nm) 2070 µW/cm² = 20.7 W/m² blue ( 420 nm - 490 nm) 692 µW/cm² = 6.92 W/m² green ( 490 nm - 575 nm) 738 µW/cm² = 7.38 W/m² yellow ( 575 nm - 585 nm) 77.3 µW/cm² = 0.773 W/m² orange ( 585 nm - 650 nm) 384 µW/cm² = 3.84 W/m² red ( 650 nm - 780 nm) 92.3 µW/cm² = 0.923 W/m² IRA ( 700 nm - 1400 nm) 36.4 µW/cm² = 0.364 W/m² IR2 ( 720 nm - 1100 nm) 8.76 µW/cm² = 0.0876 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 9.16 UV-Index Pyrimidine dimerization of DNA 98.2 µW/cm² Photoceratitis 14.6 µW/cm² Photoconjunctivitis 0.246 µW/cm² DNA Damage 0.843 Vitamin D3 41.1 µW/cm² Photosynthesis 1410 µW/cm² Luminosity 6170 lx Human L-Cone 898 µW/cm² Human M-Cone 815 µW/cm² Human S-Cone 532 µW/cm² CIE X 755 µW/cm² CIE Y 855 µW/cm² CIE Z 1010 µW/cm² PAR 9360000 mol photons Extinction preD3 271 e-3*m²/mol Extinction Tachysterol 956 e-3*m²/mol Exctincition PreD3 127000 m²/mol Extinction Lumisterol 36.7 m²/mol Exctincition Tachysterol 1360000 m²/mol Extinction 7DHC 30.8 m²/mol L-Cone 715 µW/cm² M-Cone 962 µW/cm² S-Cone 857 µW/cm² U-Cone 258 µW/cm² UVR - ICNIRP 2004 6.98 Rel Biol Eff Melatonin Supression 800 µW/cm² Blue Light Hazard 594 µW/cm² (96.2 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 45.5 µW/cm² Lumen Reptil 6500 "pseudo-lx" Vitamin D3 Degradation 48.5 µW/cm² Actinic UV 6.92 µW/cm² (11.2 mW/klm) Exctincition Lumisterol 54500 m²/mol Exctincition 7DHC 41000 m²/mol Exctincition Toxisterols 21700 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 298 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 11.7 Leybold UVB 216 µW/cm² Leybold UVA 464 µW/cm² Leybold UVC 0.0129 µW/cm² DeltaOhm UVB 497 µW/cm² DeltaOhm UVC 61.4 µW/cm² Vernier UVB 75.2 µW/cm² Vernier UVA 592 µW/cm² Gröbel UVA 637 µW/cm² Gröbel UVB 109 µW/cm² Gröbel UVC -0.069 µW/cm² Luxmeter 6390 lx Solarmeter 6.4 (D3) 36.7 IU/min UVX-31 532 µW/cm² IL UVB 0.125 µW/cm² IL UVA 516 µW/cm² Solarmeter 6.5 (UVI, post 2010) 9.83 UV-Index Solarmeter 6.2 (UVB, post 2010) 199 µW/cm² (Solarmeter Ratio = 20.2) Solarmeter AlGaN 6.5 UVI sensor 135 UV Index GenUV 7.1 UV-Index 7.5 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 24.2 W/m² Solarmeter 4.0 (UVA) 6.6 mW/cm² LS122 (manuf.) 0 W/m² ISM400 (first guess) 13.5 W/m² LS122 (assumption) 0.605 W/m² ISM400_new 10.3 W/m² Solarmeter 10.0 (Global Power) (assumption) 21.1 W/m²