AHH/BHS 2023
Spectrum 698: TG-ACDA-HAL-75-001 Edit
DeleteMeasurement
| Brand |
Arcadia UK company https://www.arcadiareptile.com/ |
|---|---|
| Lamp Product |
Arcadia Halogen Heat Lamp 75W Par30 |
| Lamp ID |
TG-ACDA-HAL-75-001 (01/2023) Halogen Heat Lamp |
| Spectrometer | FLAME UV-Vis (E) |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 50 cm |
| Age | 100 hours |
| Originator (measurement) | Thomas Griffiths |
Database entry created:
Thomas Griffiths (Tomaskas Ltd.)
28/Apr/2023 ; updated:
Thomas Griffiths (Tomaskas Ltd.)
28/Apr/2023
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 | ( 0.46 ; 0.41 ) | ( 0.62 ; 0.28 ) | ( 0.55 ; 0.28 ; 0.12 ) |
| CCT | 2700 Kelvin | 2700 Kelvin | 2700 Kelvin |
| distance | 3.4E-5 | 0.0037 | |
| 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) 4290 µW/cm² = 42.9 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) 4170 µW/cm² = 41.7 W/m² UVB (EU) ( 280 nm - 315 nm) 0 µW/cm² = 0 W/m² UVB (US) ( 280 nm - 320 nm) 0 µW/cm² = 0 W/m² UVA+B ( 280 nm - 380 nm) 10.9 µW/cm² = 0.109 W/m² Solar UVB ( 290 nm - 315 nm) 0 µW/cm² = 0 W/m² UVA D3 regulating ( 315 nm - 335 nm) 0.299 µW/cm² = 0.00299 W/m² UVA (EU) ( 315 nm - 380 nm) 10.9 µW/cm² = 0.109 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 0.732 µW/cm² = 0.00732 W/m² UVA (US) ( 320 nm - 380 nm) 10.9 µW/cm² = 0.109 W/m² UVA1 (variant) ( 335 nm - 380 nm) 10.6 µW/cm² = 0.106 W/m² UVA1 (medical) ( 340 nm - 400 nm) 20.5 µW/cm² = 0.205 W/m² vis. UVA ( 350 nm - 380 nm) 8.73 µW/cm² = 0.0873 W/m² VIS Rep3 ( 350 nm - 600 nm) 673 µW/cm² = 6.73 W/m² VIS Rep4 ( 350 nm - 700 nm) 1600 µW/cm² = 16 W/m² purple ( 380 nm - 420 nm) 25.4 µW/cm² = 0.254 W/m² VIS ( 380 nm - 780 nm) 2620 µW/cm² = 26.2 W/m² VIS2 ( 400 nm - 680 nm) 1360 µW/cm² = 13.6 W/m² PAR ( 400 nm - 700 nm) 1580 µW/cm² = 15.8 W/m² tmp ( 400 nm - 1100 nm) 4270 µW/cm² = 42.7 W/m² blue ( 420 nm - 490 nm) 123 µW/cm² = 1.23 W/m² green ( 490 nm - 575 nm) 355 µW/cm² = 3.55 W/m² yellow ( 575 nm - 585 nm) 61.3 µW/cm² = 0.613 W/m² orange ( 585 nm - 650 nm) 506 µW/cm² = 5.06 W/m² red ( 650 nm - 780 nm) 1550 µW/cm² = 15.5 W/m² IRA ( 700 nm - 1400 nm) 2690 µW/cm² = 26.9 W/m² IR2 ( 720 nm - 1100 nm) 2450 µW/cm² = 24.5 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 0.00287 UV-Index Pyrimidine dimerization of DNA 0.00615 µW/cm² Photoceratitis 0 µW/cm² Photoconjunctivitis 0 µW/cm² DNA Damage 9.44E-6 Vitamin D3 0 µW/cm² Photosynthesis 1140 µW/cm² Luminosity 4110 lx Human L-Cone 649 µW/cm² Human M-Cone 440 µW/cm² Human S-Cone 94.9 µW/cm² CIE X 638 µW/cm² CIE Y 571 µW/cm² CIE Z 185 µW/cm² PAR 8020000 mol photons Extinction preD3 0.00576 e-3*m²/mol Extinction Tachysterol 0.0267 e-3*m²/mol Exctincition PreD3 39.3 m²/mol Extinction Lumisterol 0 m²/mol Exctincition Tachysterol 631 m²/mol Extinction 7DHC 0 m²/mol L-Cone 616 µW/cm² M-Cone 308 µW/cm² S-Cone 137 µW/cm² U-Cone 49.5 µW/cm² UVR - ICNIRP 2004 0.00197 Rel Biol Eff Melatonin Supression 173 µW/cm² Blue Light Hazard 108 µW/cm² (26.2 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 0 µW/cm² Lumen Reptil 3000 "pseudo-lx" Vitamin D3 Degradation 0.00428 µW/cm² Actinic UV 0.00197 µW/cm² (0.0048 mW/klm) Exctincition Lumisterol 0.211 m²/mol Exctincition 7DHC 0.00787 m²/mol Exctincition Toxisterols 24.1 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 0.086 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 0.00109 Leybold UVB 0.0106 µW/cm² Leybold UVA 8.94 µW/cm² Leybold UVC 0 µW/cm² DeltaOhm UVB 0.457 µW/cm² DeltaOhm UVC 0.007 µW/cm² Vernier UVB 0 µW/cm² Vernier UVA 4.54 µW/cm² Gröbel UVA 8.93 µW/cm² Gröbel UVB 0.0245 µW/cm² Gröbel UVC 0 µW/cm² Luxmeter 3890 lx Solarmeter 6.4 (D3) 0.00339 IU/min UVX-31 0.963 µW/cm² IL UVB 8.85E-5 µW/cm² IL UVA 10.6 µW/cm² Solarmeter 6.5 (UVI, post 2010) 0.00058 UV-Index Solarmeter 6.2 (UVB, post 2010) 0.0205 µW/cm² (Solarmeter Ratio = 35.4) Solarmeter AlGaN 6.5 UVI sensor 0.00434 UV Index GenUV 7.1 UV-Index 0.00352 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 64.1 W/m² Solarmeter 4.0 (UVA) 0.209 mW/cm² LS122 (manuf.) 3.44 W/m² ISM400 (first guess) 72.7 W/m² LS122 (assumption) 4.81 W/m² ISM400_new 76.5 W/m² Solarmeter 10.0 (Global Power) (assumption) 65.9 W/m²