Spectrum 599: SW29 Edit
DeleteMeasurement
| Brand |
Repti-Zoo Brand by Dongguan ETAN Pet Supplies Co., Ltd., located in China. http://www.repti-zoo.com/en/index.php. |
|---|---|
| Lamp Product |
Desert UVB10.0 T5HO 24W |
| Lamp ID |
SW29 (05/2022) donated by Stephanie O’Brien-Chance / Thomas Griffiths , bought in the US by Stephanie O’Brien-Chance |
| Spectrometer | USB2000+ |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 5 cm |
| Age | 40 hours |
| Originator (measurement) | Sarina Wunderlich |
Database entry created:
Sarina Wunderlich
22/May/2022 ; updated:
Sarina Wunderlich
23/May/2022
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 | ( 0.29 ; 0.33 ) | ( 0.31 ; 0.46 ) | ( 0.25 ; 0.23 ; 0.34 ) |
| CCT | 7700 Kelvin | 7100 Kelvin | 6200 Kelvin |
| distance | 0.12 | 0.09 | |
| 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) 6530 µW/cm² = 65.3 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) 6530 µW/cm² = 65.3 W/m² UVB (EU) ( 280 nm - 315 nm) 297 µW/cm² = 2.97 W/m² UVB (US) ( 280 nm - 320 nm) 438 µW/cm² = 4.38 W/m² UVA+B ( 280 nm - 380 nm) 1540 µW/cm² = 15.4 W/m² Solar UVB ( 290 nm - 315 nm) 297 µW/cm² = 2.97 W/m² UVA D3 regulating ( 315 nm - 335 nm) 557 µW/cm² = 5.57 W/m² UVA (EU) ( 315 nm - 380 nm) 1240 µW/cm² = 12.4 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 544 µW/cm² = 5.44 W/m² UVA (US) ( 320 nm - 380 nm) 1100 µW/cm² = 11 W/m² UVA1 (variant) ( 335 nm - 380 nm) 681 µW/cm² = 6.81 W/m² UVA1 (medical) ( 340 nm - 400 nm) 639 µW/cm² = 6.39 W/m² vis. UVA ( 350 nm - 380 nm) 343 µW/cm² = 3.43 W/m² VIS Rep3 ( 350 nm - 600 nm) 4470 µW/cm² = 44.7 W/m² VIS Rep4 ( 350 nm - 700 nm) 5140 µW/cm² = 51.4 W/m² purple ( 380 nm - 420 nm) 571 µW/cm² = 5.71 W/m² VIS ( 380 nm - 780 nm) 4940 µW/cm² = 49.4 W/m² PAR ( 400 nm - 700 nm) 4710 µW/cm² = 47.1 W/m² blue ( 420 nm - 490 nm) 1430 µW/cm² = 14.3 W/m² green ( 490 nm - 575 nm) 1620 µW/cm² = 16.2 W/m² yellow ( 575 nm - 585 nm) 308 µW/cm² = 3.08 W/m² orange ( 585 nm - 650 nm) 621 µW/cm² = 6.21 W/m² red ( 650 nm - 780 nm) 387 µW/cm² = 3.87 W/m² IRA ( 700 nm - 1400 nm) 206 µW/cm² = 2.06 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 18.7 UV-Index Pyrimidine dimerization of DNA 171 µW/cm² Photoceratitis 29.7 µW/cm² Photoconjunctivitis 0.615 µW/cm² DNA Damage 2.18 Vitamin D3 78.8 µW/cm² Photosynthesis 3200 µW/cm² Luminosity 14300 lx Human L-Cone 2080 µW/cm² Human M-Cone 1880 µW/cm² Human S-Cone 1250 µW/cm² CIE X 1760 µW/cm² CIE Y 2000 µW/cm² CIE Z 2270 µW/cm² PAR 23000000 mol photons Extinction preD3 486 e-3*m²/mol Extinction Tachysterol 1720 e-3*m²/mol Exctincition PreD3 228000 m²/mol Extinction Lumisterol 83.9 m²/mol Exctincition Tachysterol 2380000 m²/mol Extinction 7DHC 83 m²/mol L-Cone 1700 µW/cm² M-Cone 1540 µW/cm² S-Cone 2310 µW/cm² U-Cone 1180 µW/cm² UVR - ICNIRP 2004 15.7 Rel Biol Eff Melatonin Supression 1670 µW/cm² Blue Light Hazard 1430 µW/cm² (100 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 86 µW/cm² Lumen Reptil 15200 "pseudo-lx" Vitamin D3 Degradation 84.6 µW/cm² Actinic UV 15.5 µW/cm² (10.8 mW/klm) Exctincition Lumisterol 118000 m²/mol Exctincition 7DHC 107000 m²/mol Exctincition Toxisterols 35800 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 505 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 22.4 Leybold UVB 373 µW/cm² Leybold UVA 762 µW/cm² Leybold UVC 0.0431 µW/cm² DeltaOhm UVB 775 µW/cm² DeltaOhm UVC 99.6 µW/cm² Vernier UVB 137 µW/cm² Vernier UVA 909 µW/cm² Gröbel UVA 1040 µW/cm² Gröbel UVB 195 µW/cm² Gröbel UVC -0.141 µW/cm² Solarmeter 6.4 (D3) 69.9 IU/min UVX-31 835 µW/cm² IL UVB 0.209 µW/cm² IL UVA 881 µW/cm² Solarmeter 6.5 (UVI, post 2010) 18.2 UV-Index Solarmeter 6.2 (UVB, post 2010) 326 µW/cm² (Solarmeter Ratio = 17.9) Solarmeter AlGaN 6.5 UVI sensor 245 UV Index GenUV 7.1 UV-Index 13.4 UV-Index Solarmeter 10.0 (Global Power) 55.1 W/m² Solarmeter 4.0 (UVA) 12.2 mW/cm² LS122 0.0627 W/m² ISM400 33 W/m²