Spectrum 579: SW13 Edit
DeleteMeasurement
| Brand |
Dragon Dragon Terraristik http://www.dragonterraristik.de |
|---|---|
| Lamp Product |
DRAGO LUX LED UV Forest 4 W |
| Lamp ID |
SW13 (09/2021) Received from Andreas Krb 10.09.2021 |
| Spectrometer | USB2000+ |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 10 cm |
| Age | 45 hours |
| Originator (measurement) | Sarina Wunderlich |
Database entry created:
Sarina Wunderlich
10/Sep/2021 ; updated:
Sarina Wunderlich
6/Oct/2021
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 | ( 0.34 ; 0.35 ) | ( 0.37 ; 0.35 ) | ( 0.3 ; 0.26 ; 0.24 ) |
| CCT | 5100 Kelvin | 5400 Kelvin | 5000 Kelvin |
| distance | 0.0066 | 0.018 | |
| 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) 1970 µW/cm² = 19.7 W/m² UVC ( 0 nm - 280 nm) 0 µW/cm² = 0 W/m² non-terrestrial ( 0 nm - 290 nm) 0.825 µW/cm² = 0.00825 W/m² total2 ( 250 nm - 880 nm) 1970 µW/cm² = 19.7 W/m² UVB (EU) ( 280 nm - 315 nm) 46.8 µW/cm² = 0.468 W/m² UVB (US) ( 280 nm - 320 nm) 50.7 µW/cm² = 0.507 W/m² UVA+B ( 280 nm - 380 nm) 59.1 µW/cm² = 0.591 W/m² Solar UVB ( 290 nm - 315 nm) 46 µW/cm² = 0.46 W/m² UVA D3 regulating ( 315 nm - 335 nm) 6.42 µW/cm² = 0.0642 W/m² UVA (EU) ( 315 nm - 380 nm) 12.3 µW/cm² = 0.123 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 2.78 µW/cm² = 0.0278 W/m² UVA (US) ( 320 nm - 380 nm) 8.4 µW/cm² = 0.084 W/m² UVA1 (variant) ( 335 nm - 380 nm) 5.86 µW/cm² = 0.0586 W/m² UVA1 (medical) ( 340 nm - 400 nm) 186 µW/cm² = 1.86 W/m² vis. UVA ( 350 nm - 380 nm) 5.21 µW/cm² = 0.0521 W/m² VIS Rep3 ( 350 nm - 600 nm) 1340 µW/cm² = 13.4 W/m² VIS Rep4 ( 350 nm - 700 nm) 1840 µW/cm² = 18.4 W/m² purple ( 380 nm - 420 nm) 245 µW/cm² = 2.45 W/m² VIS ( 380 nm - 780 nm) 1910 µW/cm² = 19.1 W/m² PAR ( 400 nm - 700 nm) 1660 µW/cm² = 16.6 W/m² blue ( 420 nm - 490 nm) 368 µW/cm² = 3.68 W/m² green ( 490 nm - 575 nm) 553 µW/cm² = 5.53 W/m² yellow ( 575 nm - 585 nm) 69.3 µW/cm² = 0.693 W/m² orange ( 585 nm - 650 nm) 414 µW/cm² = 4.14 W/m² red ( 650 nm - 780 nm) 259 µW/cm² = 2.59 W/m² IRA ( 700 nm - 1400 nm) 76.1 µW/cm² = 0.761 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 5.52 UV-Index Pyrimidine dimerization of DNA 32.8 µW/cm² Photoceratitis 8.15 µW/cm² Photoconjunctivitis 0.37 µW/cm² DNA Damage 1.07 Vitamin D3 22.7 µW/cm² Photosynthesis 1120 µW/cm² Luminosity 5070 lx Human L-Cone 762 µW/cm² Human M-Cone 622 µW/cm² Human S-Cone 317 µW/cm² CIE X 685 µW/cm² CIE Y 706 µW/cm² CIE Z 609 µW/cm² PAR 7900000 mol photons Extinction preD3 87.7 e-3*m²/mol Extinction Tachysterol 296 e-3*m²/mol Exctincition PreD3 42200 m²/mol Extinction Lumisterol 32.8 m²/mol Exctincition Tachysterol 374000 m²/mol Extinction 7DHC 34 m²/mol L-Cone 655 µW/cm² M-Cone 572 µW/cm² S-Cone 533 µW/cm² U-Cone 424 µW/cm² UVR - ICNIRP 2004 5.63 Rel Biol Eff Melatonin Supression 463 µW/cm² Blue Light Hazard 342 µW/cm² (67.4 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 25.5 µW/cm² Lumen Reptil 5050 "pseudo-lx" Vitamin D3 Degradation 12.5 µW/cm² Actinic UV 5.54 µW/cm² (10.9 mW/klm) Exctincition Lumisterol 40600 m²/mol Exctincition 7DHC 41800 m²/mol Exctincition Toxisterols 4080 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 56.6 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 6.45 Leybold UVB 45.8 µW/cm² Leybold UVA 22.8 µW/cm² Leybold UVC 0.0175 µW/cm² DeltaOhm UVB 43.6 µW/cm² DeltaOhm UVC 8.63 µW/cm² Vernier UVB 30.9 µW/cm² Vernier UVA 15.2 µW/cm² Gröbel UVA 14.8 µW/cm² Gröbel UVB 34.2 µW/cm² Gröbel UVC 0.0559 µW/cm² Solarmeter 6.4 (D3) 20.2 IU/min UVX-31 50.2 µW/cm² IL UVB 0.025 µW/cm² IL UVA 17.7 µW/cm² Solarmeter 6.5 (UVI, post 2010) 4.81 UV-Index Solarmeter 6.2 (UVB, post 2010) 27.7 µW/cm² (Solarmeter Ratio = 5.77) Solarmeter AlGaN 6.5 UVI sensor 42.5 UV Index GenUV 7.1 UV-Index 2.03 UV-Index Solarmeter 10.0 (Global Power) 20.1 W/m² Solarmeter 4.0 (UVA) 1.39 mW/cm² LS122 0.00557 W/m² ISM400 14.3 W/m²