Spectrum 785: SW88 Edit
DeleteMeasurement
| Brand |
Reptile Nova https://www.novaeuro.com |
|---|---|
| Lamp Product |
Extra Strong UVB 15.0 13W |
| Lamp ID |
SW88 (01/2024) |
| Spectrometer | USB2000+ |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 5 cm |
| Age | 200 hours |
| Originator (measurement) | Sarina Wunderlich |
Database entry created:
Sarina Wunderlich
28/May/2024 ; updated:
Sarina Wunderlich
28/May/2024
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 | ( 0.3 ; 0.3 ) | ( 0.3 ; 0.47 ) | ( 0.25 ; 0.22 ; 0.35 ) |
| CCT | 7300 Kelvin | 7400 Kelvin | 6300 Kelvin |
| distance | 0.13 | 0.099 | |
| 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) 2060 µW/cm² = 20.6 W/m² UVC ( 0 nm - 280 nm) 0.14 µW/cm² = 0.0014 W/m² non-terrestrial ( 0 nm - 290 nm) 0.729 µW/cm² = 0.00729 W/m² total2 ( 250 nm - 880 nm) 2060 µW/cm² = 20.6 W/m² UVB (EU) ( 280 nm - 315 nm) 68.5 µW/cm² = 0.685 W/m² UVB (US) ( 280 nm - 320 nm) 101 µW/cm² = 1.01 W/m² UVA+B ( 280 nm - 380 nm) 452 µW/cm² = 4.52 W/m² Solar UVB ( 290 nm - 315 nm) 67.9 µW/cm² = 0.679 W/m² UVA D3 regulating ( 315 nm - 335 nm) 143 µW/cm² = 1.43 W/m² UVA (EU) ( 315 nm - 380 nm) 383 µW/cm² = 3.83 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 144 µW/cm² = 1.44 W/m² UVA (US) ( 320 nm - 380 nm) 351 µW/cm² = 3.51 W/m² UVA1 (variant) ( 335 nm - 380 nm) 240 µW/cm² = 2.4 W/m² UVA1 (medical) ( 340 nm - 400 nm) 230 µW/cm² = 2.3 W/m² vis. UVA ( 350 nm - 380 nm) 149 µW/cm² = 1.49 W/m² VIS Rep3 ( 350 nm - 600 nm) 1330 µW/cm² = 13.3 W/m² VIS Rep4 ( 350 nm - 700 nm) 1670 µW/cm² = 16.7 W/m² purple ( 380 nm - 420 nm) 118 µW/cm² = 1.18 W/m² VIS ( 380 nm - 780 nm) 1590 µW/cm² = 15.9 W/m² VIS2 ( 400 nm - 680 nm) 1460 µW/cm² = 14.6 W/m² PAR ( 400 nm - 700 nm) 1500 µW/cm² = 15 W/m² tmp ( 400 nm - 1100 nm) 1580 µW/cm² = 15.8 W/m² blue ( 420 nm - 490 nm) 477 µW/cm² = 4.77 W/m² green ( 490 nm - 575 nm) 442 µW/cm² = 4.42 W/m² yellow ( 575 nm - 585 nm) 81 µW/cm² = 0.81 W/m² orange ( 585 nm - 650 nm) 283 µW/cm² = 2.83 W/m² red ( 650 nm - 780 nm) 188 µW/cm² = 1.88 W/m² IRA ( 700 nm - 1400 nm) 82.4 µW/cm² = 0.824 W/m² IR2 ( 720 nm - 1100 nm) 51.1 µW/cm² = 0.511 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 5.94 UV-Index Pyrimidine dimerization of DNA 42.4 µW/cm² Photoceratitis 9.05 µW/cm² Photoconjunctivitis 0.398 µW/cm² DNA Damage 1.11 Vitamin D3 22.9 µW/cm² Photosynthesis 1050 µW/cm² Luminosity 4220 lx Human L-Cone 627 µW/cm² Human M-Cone 534 µW/cm² Human S-Cone 409 µW/cm² CIE X 586 µW/cm² CIE Y 587 µW/cm² CIE Z 752 µW/cm² PAR 7160000 mol photons Extinction preD3 127 e-3*m²/mol Extinction Tachysterol 454 e-3*m²/mol Exctincition PreD3 63000 m²/mol Extinction Lumisterol 32.7 m²/mol Exctincition Tachysterol 632000 m²/mol Extinction 7DHC 35.9 m²/mol L-Cone 523 µW/cm² M-Cone 466 µW/cm² S-Cone 741 µW/cm² U-Cone 370 µW/cm² UVR - ICNIRP 2004 5.76 Rel Biol Eff Melatonin Supression 519 µW/cm² Blue Light Hazard 457 µW/cm² (108 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 25 µW/cm² Lumen Reptil 4660 "pseudo-lx" Vitamin D3 Degradation 21.2 µW/cm² Actinic UV 5.69 µW/cm² (13.5 mW/klm) Exctincition Lumisterol 42400 m²/mol Exctincition 7DHC 44300 m²/mol Exctincition Toxisterols 9270 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 122 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 6.64 Leybold UVB 88.1 µW/cm² Leybold UVA 242 µW/cm² Leybold UVC 0.0727 µW/cm² DeltaOhm UVB 191 µW/cm² DeltaOhm UVC 24.6 µW/cm² Vernier UVB 34.8 µW/cm² Vernier UVA 251 µW/cm² Gröbel UVA 317 µW/cm² Gröbel UVB 48.7 µW/cm² Gröbel UVC 0.0714 µW/cm² Luxmeter 4340 lx Solarmeter 6.4 (D3) 20.8 IU/min UVX-31 208 µW/cm² IL UVB 0.0524 µW/cm² IL UVA 286 µW/cm² Solarmeter 6.5 (UVI, post 2010) 5.1 UV-Index Solarmeter 6.2 (UVB, post 2010) 78.1 µW/cm² (Solarmeter Ratio = 15.3) Solarmeter AlGaN 6.5 UVI sensor 58.9 UV Index GenUV 7.1 UV-Index 3.2 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 18.2 W/m² Solarmeter 4.0 (UVA) 3.88 mW/cm² LS122 (manuf.) 0.0118 W/m² ISM400 (first guess) 11.6 W/m² LS122 (assumption) 0.56 W/m² ISM400_new 9.46 W/m² Solarmeter 10.0 (Global Power) (assumption) 16.4 W/m²