Spectrum 523: BA53 Edit
DeleteMeasurement
| Brand |
Arcadia UK company https://www.arcadiareptile.com/ |
|---|---|
| Lamp Product |
D3+ Dragon 14% Reptile Lamp T5 24W |
| Lamp ID |
BA53 (04/2016) |
| Spectrometer | USB 2000 |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 10 cm |
| Age | 105 hours |
| Originator (measurement) | Frances Baines |
Database entry created:
Frances Baines
15/Apr/2016 ; updated:
Sarina Wunderlich
25/Oct/2016
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 250.02 - 750.25 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 | ( 0.28 ; 0.3 ) | ( 0.36 ; 0.46 ) | ( 0.23 ; 0.28 ; 0.36 ) |
| CCT | 9200 Kelvin | 5700 Kelvin | 6200 Kelvin |
| distance | 0.12 | 0.096 | |
| 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) 2060 µW/cm² = 20.6 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) 2060 µW/cm² = 20.6 W/m² UVB (EU) ( 280 nm - 315 nm) 160 µW/cm² = 1.6 W/m² UVB (US) ( 280 nm - 320 nm) 258 µW/cm² = 2.58 W/m² UVA+B ( 280 nm - 380 nm) 926 µW/cm² = 9.26 W/m² Solar UVB ( 290 nm - 315 nm) 160 µW/cm² = 1.6 W/m² UVA D3 regulating ( 315 nm - 335 nm) 394 µW/cm² = 3.94 W/m² UVA (EU) ( 315 nm - 380 nm) 766 µW/cm² = 7.66 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 387 µW/cm² = 3.87 W/m² UVA (US) ( 320 nm - 380 nm) 668 µW/cm² = 6.68 W/m² UVA1 (variant) ( 335 nm - 380 nm) 372 µW/cm² = 3.72 W/m² UVA1 (medical) ( 340 nm - 400 nm) 287 µW/cm² = 2.87 W/m² vis. UVA ( 350 nm - 380 nm) 133 µW/cm² = 1.33 W/m² VIS Rep3 ( 350 nm - 600 nm) 1070 µW/cm² = 10.7 W/m² VIS Rep4 ( 350 nm - 700 nm) 1260 µW/cm² = 12.6 W/m² purple ( 380 nm - 420 nm) 79.3 µW/cm² = 0.793 W/m² VIS ( 380 nm - 780 nm) 1130 µW/cm² = 11.3 W/m² PAR ( 400 nm - 700 nm) 1120 µW/cm² = 11.2 W/m² blue ( 420 nm - 490 nm) 409 µW/cm² = 4.09 W/m² green ( 490 nm - 575 nm) 366 µW/cm² = 3.66 W/m² yellow ( 575 nm - 585 nm) 46.3 µW/cm² = 0.463 W/m² orange ( 585 nm - 650 nm) 194 µW/cm² = 1.94 W/m² red ( 650 nm - 780 nm) 39 µW/cm² = 0.39 W/m² IRA ( 700 nm - 1400 nm) 10.1 µW/cm² = 0.101 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 7.35 UV-Index Pyrimidine dimerization of DNA 95.7 µW/cm² Photoceratitis 12.2 µW/cm² Photoconjunctivitis 0.142 µW/cm² DNA Damage 0.463 Vitamin D3 35.1 µW/cm² Photosynthesis 785 µW/cm² Luminosity 3220 lx Human L-Cone 470 µW/cm² Human M-Cone 423 µW/cm² Human S-Cone 333 µW/cm² CIE X 420 µW/cm² CIE Y 446 µW/cm² CIE Z 620 µW/cm² PAR 5230000 mol photons Extinction preD3 262 e-3*m²/mol Extinction Tachysterol 922 e-3*m²/mol Exctincition PreD3 120000 m²/mol Extinction Lumisterol 24 m²/mol Exctincition Tachysterol 1310000 m²/mol Extinction 7DHC 14.7 m²/mol L-Cone 377 µW/cm² M-Cone 449 µW/cm² S-Cone 575 µW/cm² U-Cone 217 µW/cm² UVR - ICNIRP 2004 4.77 Rel Biol Eff Melatonin Supression 455 µW/cm² Blue Light Hazard 377 µW/cm² (117 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 38.9 µW/cm² Lumen Reptil 3650 "pseudo-lx" Vitamin D3 Degradation 48.2 µW/cm² Actinic UV 4.75 µW/cm² (14.8 mW/klm) Exctincition Lumisterol 40300 m²/mol Exctincition 7DHC 21400 m²/mol Exctincition Toxisterols 21500 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 305 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 10 Leybold UVB 220 µW/cm² Leybold UVA 459 µW/cm² Leybold UVC 0.00254 µW/cm² DeltaOhm UVB 509 µW/cm² DeltaOhm UVC 62.9 µW/cm² Vernier UVB 73.9 µW/cm² Vernier UVA 604 µW/cm² Gröbel UVA 639 µW/cm² Gröbel UVB 106 µW/cm² Gröbel UVC -0.0695 µW/cm² Solarmeter 6.4 (D3) 31.4 IU/min UVX-31 543 µW/cm² IL UVB 0.125 µW/cm² IL UVA 514 µW/cm² Solarmeter 6.5 (UVI, post 2010) 8.79 UV-Index Solarmeter 6.2 (UVB, post 2010) 206 µW/cm² (Solarmeter Ratio = 23.4) Solarmeter AlGaN 6.5 UVI sensor 133 UV Index GenUV 7.1 UV-Index 7.52 UV-Index Solarmeter 10.0 (Global Power) 14.5 W/m² Solarmeter 4.0 (UVA) 6.53 mW/cm² LS122 0 W/m² ISM400 7.07 W/m²