Spectrum 747: SW84 Edit
DeleteMeasurement
| Brand |
other other |
|---|---|
| Lamp Product |
Hydrosun 575 home |
| Lamp ID |
SW84 (01/2010) |
| Spectrometer | USB2000+ |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 100 cm |
| Age | 100 hours |
| Originator (measurement) | Sarina Wunderlich |
Database entry created:
Sarina Wunderlich
31/Dec/2023 ; updated:
Sarina Wunderlich
31/Dec/2023
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 | ( 0.45 ; 0.4 ) | ( 0.62 ; 0.33 ) | ( 0.56 ; 0.27 ; 0.15 ) |
| CCT | 2800 Kelvin | 2800 Kelvin | 2700 Kelvin |
| distance | 0.047 | 0.022 | |
| 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) 4120 µW/cm² = 41.2 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) 3920 µW/cm² = 39.2 W/m² UVB (EU) ( 280 nm - 315 nm) 0.691 µW/cm² = 0.00691 W/m² UVB (US) ( 280 nm - 320 nm) 0.921 µW/cm² = 0.00921 W/m² UVA+B ( 280 nm - 380 nm) 2.72 µW/cm² = 0.0272 W/m² Solar UVB ( 290 nm - 315 nm) 0.691 µW/cm² = 0.00691 W/m² UVA D3 regulating ( 315 nm - 335 nm) 0.817 µW/cm² = 0.00817 W/m² UVA (EU) ( 315 nm - 380 nm) 2.03 µW/cm² = 0.0203 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 0.74 µW/cm² = 0.0074 W/m² UVA (US) ( 320 nm - 380 nm) 1.8 µW/cm² = 0.018 W/m² UVA1 (variant) ( 335 nm - 380 nm) 1.21 µW/cm² = 0.0121 W/m² UVA1 (medical) ( 340 nm - 400 nm) 1.63 µW/cm² = 0.0163 W/m² vis. UVA ( 350 nm - 380 nm) 0.749 µW/cm² = 0.00749 W/m² VIS Rep3 ( 350 nm - 600 nm) 157 µW/cm² = 1.57 W/m² VIS Rep4 ( 350 nm - 700 nm) 314 µW/cm² = 3.14 W/m² purple ( 380 nm - 420 nm) 3.68 µW/cm² = 0.0368 W/m² VIS ( 380 nm - 780 nm) 1270 µW/cm² = 12.7 W/m² PAR ( 400 nm - 700 nm) 313 µW/cm² = 3.13 W/m² blue ( 420 nm - 490 nm) 31.5 µW/cm² = 0.315 W/m² green ( 490 nm - 575 nm) 79.1 µW/cm² = 0.791 W/m² yellow ( 575 nm - 585 nm) 15.5 µW/cm² = 0.155 W/m² orange ( 585 nm - 650 nm) 108 µW/cm² = 1.08 W/m² red ( 650 nm - 780 nm) 1030 µW/cm² = 10.3 W/m² IRA ( 700 nm - 1400 nm) 3800 µW/cm² = 38 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 0.0572 UV-Index Pyrimidine dimerization of DNA 0.513 µW/cm² Photoceratitis 0.087 µW/cm² Photoconjunctivitis 0.00152 µW/cm² DNA Damage 0.005 Vitamin D3 0.284 µW/cm² Photosynthesis 226 µW/cm² Luminosity 943 lx Human L-Cone 149 µW/cm² Human M-Cone 102 µW/cm² Human S-Cone 24.4 µW/cm² CIE X 146 µW/cm² CIE Y 131 µW/cm² CIE Z 47.2 µW/cm² PAR 1550000 mol photons Extinction preD3 1.25 e-3*m²/mol Extinction Tachysterol 4.16 e-3*m²/mol Exctincition PreD3 564 m²/mol Extinction Lumisterol 0.254 m²/mol Exctincition Tachysterol 5510 m²/mol Extinction 7DHC 0.159 m²/mol L-Cone 139 µW/cm² M-Cone 68 µW/cm² S-Cone 36.1 µW/cm² U-Cone 5.45 µW/cm² UVR - ICNIRP 2004 0.0488 Rel Biol Eff Melatonin Supression 41.4 µW/cm² Blue Light Hazard 27.4 µW/cm² (29 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 0.324 µW/cm² Lumen Reptil 676 "pseudo-lx" Vitamin D3 Degradation 0.197 µW/cm² Actinic UV 0.0471 µW/cm² (0.5 mW/klm) Exctincition Lumisterol 344 m²/mol Exctincition 7DHC 211 m²/mol Exctincition Toxisterols 75.1 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 1.06 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 0.0795 Leybold UVB 0.828 µW/cm² Leybold UVA 1.28 µW/cm² Leybold UVC 0 µW/cm² DeltaOhm UVB 1.33 µW/cm² DeltaOhm UVC 0.193 µW/cm² Vernier UVB 0.394 µW/cm² Vernier UVA 1.4 µW/cm² Gröbel UVA 1.68 µW/cm² Gröbel UVB 0.511 µW/cm² Gröbel UVC 0.000356 µW/cm² Solarmeter 6.4 (D3) 0.248 IU/min UVX-31 1.48 µW/cm² IL UVB 0.000458 µW/cm² IL UVA 1.51 µW/cm² Solarmeter 6.5 (UVI, post 2010) 0.0634 UV-Index Solarmeter 6.2 (UVB, post 2010) 0.629 µW/cm² (Solarmeter Ratio = 9.91) Solarmeter AlGaN 6.5 UVI sensor 0.636 UV Index GenUV 7.1 UV-Index 0.0321 UV-Index Solarmeter 10.0 (Global Power) 67.8 W/m² Solarmeter 4.0 (UVA) 0.0243 mW/cm² LS122 3.56 W/m² ISM400 85.8 W/m²