with reflector sheet in the wrong orientation, pointing towards the reflector away from the lamp
Spectrum 601: 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 | 0.5 cm |
| Age | 43 hours |
| Originator (measurement) | Sarina Wunderlich |
Database entry created:
Sarina Wunderlich
25/May/2022 ; updated:
Sarina Wunderlich
25/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 ) | ( 0.32 ; 0.46 ) | ( 0.25 ; 0.24 ; 0.35 ) |
| CCT | 7700 Kelvin | 6800 Kelvin | 6100 Kelvin |
| distance | 0.12 | 0.091 | |
| 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) 5020 µW/cm² = 50.2 W/m² UVC ( 0 nm - 280 nm) 165 µW/cm² = 1.65 W/m² non-terrestrial ( 0 nm - 290 nm) 220 µW/cm² = 2.2 W/m² total2 ( 250 nm - 880 nm) 4790 µW/cm² = 47.9 W/m² UVB (EU) ( 280 nm - 315 nm) 36 µW/cm² = 0.36 W/m² UVB (US) ( 280 nm - 320 nm) 51.4 µW/cm² = 0.514 W/m² UVA+B ( 280 nm - 380 nm) 639 µW/cm² = 6.39 W/m² Solar UVB ( 290 nm - 315 nm) 32.7 µW/cm² = 0.327 W/m² UVA D3 regulating ( 315 nm - 335 nm) 159 µW/cm² = 1.59 W/m² UVA (EU) ( 315 nm - 380 nm) 603 µW/cm² = 6.03 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 213 µW/cm² = 2.13 W/m² UVA (US) ( 320 nm - 380 nm) 587 µW/cm² = 5.87 W/m² UVA1 (variant) ( 335 nm - 380 nm) 443 µW/cm² = 4.43 W/m² UVA1 (medical) ( 340 nm - 400 nm) 449 µW/cm² = 4.49 W/m² vis. UVA ( 350 nm - 380 nm) 244 µW/cm² = 2.44 W/m² VIS Rep3 ( 350 nm - 600 nm) 3650 µW/cm² = 36.5 W/m² VIS Rep4 ( 350 nm - 700 nm) 4210 µW/cm² = 42.1 W/m² purple ( 380 nm - 420 nm) 452 µW/cm² = 4.52 W/m² VIS ( 380 nm - 780 nm) 4090 µW/cm² = 40.9 W/m² PAR ( 400 nm - 700 nm) 3890 µW/cm² = 38.9 W/m² blue ( 420 nm - 490 nm) 1200 µW/cm² = 12 W/m² green ( 490 nm - 575 nm) 1340 µW/cm² = 13.4 W/m² yellow ( 575 nm - 585 nm) 245 µW/cm² = 2.45 W/m² orange ( 585 nm - 650 nm) 529 µW/cm² = 5.29 W/m² red ( 650 nm - 780 nm) 327 µW/cm² = 3.27 W/m² IRA ( 700 nm - 1400 nm) 195 µW/cm² = 1.95 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 4.26 UV-Index Pyrimidine dimerization of DNA 21 µW/cm² Photoceratitis 6.45 µW/cm² Photoconjunctivitis 0.983 µW/cm² DNA Damage 2.18 Vitamin D3 12.5 µW/cm² Photosynthesis 2650 µW/cm² Luminosity 11800 lx Human L-Cone 1720 µW/cm² Human M-Cone 1550 µW/cm² Human S-Cone 1040 µW/cm² CIE X 1460 µW/cm² CIE Y 1650 µW/cm² CIE Z 1890 µW/cm² PAR 18800000 mol photons Extinction preD3 83.3 e-3*m²/mol Extinction Tachysterol 306 e-3*m²/mol Exctincition PreD3 52700 m²/mol Extinction Lumisterol 37.3 m²/mol Exctincition Tachysterol 493000 m²/mol Extinction 7DHC 47.7 m²/mol L-Cone 1400 µW/cm² M-Cone 1300 µW/cm² S-Cone 1910 µW/cm² U-Cone 909 µW/cm² UVR - ICNIRP 2004 5.47 Rel Biol Eff Melatonin Supression 1390 µW/cm² Blue Light Hazard 1180 µW/cm² (101 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 13.3 µW/cm² Lumen Reptil 12500 "pseudo-lx" Vitamin D3 Degradation 13.7 µW/cm² Actinic UV 5.43 µW/cm² (4.62 mW/klm) Exctincition Lumisterol 45700 m²/mol Exctincition 7DHC 56000 m²/mol Exctincition Toxisterols 8530 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 73.6 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 4.14 Leybold UVB 48.2 µW/cm² Leybold UVA 450 µW/cm² Leybold UVC 0.0525 µW/cm² DeltaOhm UVB 182 µW/cm² DeltaOhm UVC 17.6 µW/cm² Vernier UVB 16.7 µW/cm² Vernier UVA 372 µW/cm² Gröbel UVA 520 µW/cm² Gröbel UVB 28.7 µW/cm² Gröbel UVC 0.317 µW/cm² Solarmeter 6.4 (D3) 12.9 IU/min UVX-31 213 µW/cm² IL UVB 0.0391 µW/cm² IL UVA 494 µW/cm² Solarmeter 6.5 (UVI, post 2010) 2.86 UV-Index Solarmeter 6.2 (UVB, post 2010) 50.7 µW/cm² (Solarmeter Ratio = 17.8) Solarmeter AlGaN 6.5 UVI sensor 30.1 UV Index GenUV 7.1 UV-Index 1.75 UV-Index Solarmeter 10.0 (Global Power) 43.7 W/m² Solarmeter 4.0 (UVA) 6.96 mW/cm² LS122 0.0874 W/m² ISM400 27.8 W/m²