Spectrum 580: SW12 Edit
DeleteMeasurement
| Brand |
Dragon Dragon Terraristik http://www.dragonterraristik.de |
|---|---|
| Lamp Product |
DRAGO LUX LED UV Desert 8 W |
| Lamp ID |
SW12 (09/2021) Received from Andreas Krb 10.09.2021 |
| Spectrometer | USB2000+ |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 20 cm |
| Age | 4 hours |
| Originator (measurement) | Sarina Wunderlich |
Database entry created:
Sarina Wunderlich
10/Sep/2021 ; updated:
Sarina Wunderlich
25/Sep/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 ; 0.34 ) | ( 0.28 ; 0.32 ) | ( 0.24 ; 0.21 ; 0.24 ) |
| CCT | 5200 Kelvin | 9600 Kelvin | 6800 Kelvin |
| distance | 0.02 | 0.054 | |
| 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) 611 µW/cm² = 6.11 W/m² UVC ( 0 nm - 280 nm) 0 µW/cm² = 0 W/m² non-terrestrial ( 0 nm - 290 nm) 0.367 µW/cm² = 0.00367 W/m² total2 ( 250 nm - 880 nm) 611 µW/cm² = 6.11 W/m² UVB (EU) ( 280 nm - 315 nm) 39.9 µW/cm² = 0.399 W/m² UVB (US) ( 280 nm - 320 nm) 42.9 µW/cm² = 0.429 W/m² UVA+B ( 280 nm - 380 nm) 46.8 µW/cm² = 0.468 W/m² Solar UVB ( 290 nm - 315 nm) 39.5 µW/cm² = 0.395 W/m² UVA D3 regulating ( 315 nm - 335 nm) 4.72 µW/cm² = 0.0472 W/m² UVA (EU) ( 315 nm - 380 nm) 6.86 µW/cm² = 0.0686 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 1.91 µW/cm² = 0.0191 W/m² UVA (US) ( 320 nm - 380 nm) 3.91 µW/cm² = 0.0391 W/m² UVA1 (variant) ( 335 nm - 380 nm) 2.14 µW/cm² = 0.0214 W/m² UVA1 (medical) ( 340 nm - 400 nm) 83.1 µW/cm² = 0.831 W/m² vis. UVA ( 350 nm - 380 nm) 1.82 µW/cm² = 0.0182 W/m² VIS Rep3 ( 350 nm - 600 nm) 414 µW/cm² = 4.14 W/m² VIS Rep4 ( 350 nm - 700 nm) 544 µW/cm² = 5.44 W/m² purple ( 380 nm - 420 nm) 138 µW/cm² = 1.38 W/m² VIS ( 380 nm - 780 nm) 562 µW/cm² = 5.62 W/m² VIS2 ( 400 nm - 680 nm) 447 µW/cm² = 4.47 W/m² PAR ( 400 nm - 700 nm) 461 µW/cm² = 4.61 W/m² tmp ( 400 nm - 1100 nm) 483 µW/cm² = 4.83 W/m² blue ( 420 nm - 490 nm) 96.8 µW/cm² = 0.968 W/m² green ( 490 nm - 575 nm) 136 µW/cm² = 1.36 W/m² yellow ( 575 nm - 585 nm) 17.3 µW/cm² = 0.173 W/m² orange ( 585 nm - 650 nm) 105 µW/cm² = 1.05 W/m² red ( 650 nm - 780 nm) 69.1 µW/cm² = 0.691 W/m² IRA ( 700 nm - 1400 nm) 21.3 µW/cm² = 0.213 W/m² IR2 ( 720 nm - 1100 nm) 12.1 µW/cm² = 0.121 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 4.9 UV-Index Pyrimidine dimerization of DNA 28.4 µW/cm² Photoceratitis 7.12 µW/cm² Photoconjunctivitis 0.252 µW/cm² DNA Damage 0.809 Vitamin D3 20.2 µW/cm² Photosynthesis 312 µW/cm² Luminosity 1270 lx Human L-Cone 191 µW/cm² Human M-Cone 155 µW/cm² Human S-Cone 88.7 µW/cm² CIE X 174 µW/cm² CIE Y 176 µW/cm² CIE Z 164 µW/cm² PAR 2310000 mol photons Extinction preD3 75.3 e-3*m²/mol Extinction Tachysterol 255 e-3*m²/mol Exctincition PreD3 35800 m²/mol Extinction Lumisterol 27.9 m²/mol Exctincition Tachysterol 322000 m²/mol Extinction 7DHC 28.7 m²/mol L-Cone 164 µW/cm² M-Cone 145 µW/cm² S-Cone 165 µW/cm² U-Cone 215 µW/cm² UVR - ICNIRP 2004 4.93 Rel Biol Eff Melatonin Supression 137 µW/cm² Blue Light Hazard 102 µW/cm² (80.5 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 22.6 µW/cm² Lumen Reptil 1530 "pseudo-lx" Vitamin D3 Degradation 10.7 µW/cm² Actinic UV 4.84 µW/cm² (38.2 mW/klm) Exctincition Lumisterol 34500 m²/mol Exctincition 7DHC 35600 m²/mol Exctincition Toxisterols 3450 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 47.8 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 5.69 Leybold UVB 39.2 µW/cm² Leybold UVA 9.15 µW/cm² Leybold UVC 0.0134 µW/cm² DeltaOhm UVB 36.4 µW/cm² DeltaOhm UVC 7.26 µW/cm² Vernier UVB 26.8 µW/cm² Vernier UVA 10.7 µW/cm² Gröbel UVA 8.74 µW/cm² Gröbel UVB 29.6 µW/cm² Gröbel UVC 0.0175 µW/cm² Luxmeter 1280 lx Solarmeter 6.4 (D3) 17.8 IU/min UVX-31 42.1 µW/cm² IL UVB 0.0214 µW/cm² IL UVA 7.51 µW/cm² Solarmeter 6.5 (UVI, post 2010) 4.23 UV-Index Solarmeter 6.2 (UVB, post 2010) 23.4 µW/cm² (Solarmeter Ratio = 5.52) Solarmeter AlGaN 6.5 UVI sensor 36.5 UV Index GenUV 7.1 UV-Index 1.72 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 5.67 W/m² Solarmeter 4.0 (UVA) 0.644 mW/cm² LS122 (manuf.) 0.00234 W/m² ISM400 (first guess) 3.77 W/m² LS122 (assumption) 0.187 W/m² ISM400_new 3.09 W/m² Solarmeter 10.0 (Global Power) (assumption) 5.23 W/m²