LEaf Nose
Spectrum 696: TG-Leaf Nose Edit
DeleteMeasurement
| Brand |
Enclosure Setup |
|---|---|
| Lamp Product |
Enclosure |
| Lamp ID |
TG-Leaf Nose (03/2023) |
| Spectrometer | FLAME UV-Vis (E) |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 30 cm |
| Age | 100 hours |
| Originator (measurement) | Thomas Griffiths |
Database entry created:
Thomas Griffiths (Tomaskas Ltd.)
24/Apr/2023 ; updated:
Thomas Griffiths (Tomaskas Ltd.)
24/Sep/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 | ( 0.34 ; 0.35 ) | ( 0.37 ; 0.34 ) | ( 0.28 ; 0.27 ; 0.24 ) |
| CCT | 5000 Kelvin | 5400 Kelvin | 5200 Kelvin |
| distance | 0.0024 | 0.0077 | |
| 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) 2.11 µW/cm² = 0.0211 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) 2.11 µW/cm² = 0.0211 W/m² UVB (EU) ( 280 nm - 315 nm) 0.0415 µW/cm² = 0.000415 W/m² UVB (US) ( 280 nm - 320 nm) 0.0657 µW/cm² = 0.000657 W/m² UVA+B ( 280 nm - 380 nm) 0.275 µW/cm² = 0.00275 W/m² Solar UVB ( 290 nm - 315 nm) 0.0415 µW/cm² = 0.000415 W/m² UVA D3 regulating ( 315 nm - 335 nm) 0.0995 µW/cm² = 0.000995 W/m² UVA (EU) ( 315 nm - 380 nm) 0.234 µW/cm² = 0.00234 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 0.103 µW/cm² = 0.00103 W/m² UVA (US) ( 320 nm - 380 nm) 0.209 µW/cm² = 0.00209 W/m² UVA1 (variant) ( 335 nm - 380 nm) 0.134 µW/cm² = 0.00134 W/m² UVA1 (medical) ( 340 nm - 400 nm) 0.202 µW/cm² = 0.00202 W/m² vis. UVA ( 350 nm - 380 nm) 0.0855 µW/cm² = 0.000855 W/m² VIS Rep3 ( 350 nm - 600 nm) 1.31 µW/cm² = 0.0131 W/m² VIS Rep4 ( 350 nm - 700 nm) 1.84 µW/cm² = 0.0184 W/m² purple ( 380 nm - 420 nm) 0.199 µW/cm² = 0.00199 W/m² VIS ( 380 nm - 780 nm) 1.83 µW/cm² = 0.0183 W/m² VIS2 ( 400 nm - 680 nm) 1.59 µW/cm² = 0.0159 W/m² PAR ( 400 nm - 700 nm) 1.66 µW/cm² = 0.0166 W/m² tmp ( 400 nm - 1100 nm) 1.74 µW/cm² = 0.0174 W/m² blue ( 420 nm - 490 nm) 0.357 µW/cm² = 0.00357 W/m² green ( 490 nm - 575 nm) 0.518 µW/cm² = 0.00518 W/m² yellow ( 575 nm - 585 nm) 0.0582 µW/cm² = 0.000582 W/m² orange ( 585 nm - 650 nm) 0.408 µW/cm² = 0.00408 W/m² red ( 650 nm - 780 nm) 0.293 µW/cm² = 0.00293 W/m² IRA ( 700 nm - 1400 nm) 0.0854 µW/cm² = 0.000854 W/m² IR2 ( 720 nm - 1100 nm) 0.047 µW/cm² = 0.00047 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 0.00288 UV-Index Pyrimidine dimerization of DNA 0.028 µW/cm² Photoceratitis 0.00435 µW/cm² Photoconjunctivitis 8.57E-5 µW/cm² DNA Damage 0.0003 Vitamin D3 0.0127 µW/cm² Photosynthesis 1.14 µW/cm² Luminosity 4.67 lx Human L-Cone 0.702 µW/cm² Human M-Cone 0.57 µW/cm² Human S-Cone 0.307 µW/cm² CIE X 0.636 µW/cm² CIE Y 0.648 µW/cm² CIE Z 0.565 µW/cm² PAR 7820 mol photons Extinction preD3 0.076 e-3*m²/mol Extinction Tachysterol 0.267 e-3*m²/mol Exctincition PreD3 35.6 m²/mol Extinction Lumisterol 0.0125 m²/mol Exctincition Tachysterol 374 m²/mol Extinction 7DHC 0.0109 m²/mol L-Cone 0.605 µW/cm² M-Cone 0.572 µW/cm² S-Cone 0.52 µW/cm² U-Cone 0.439 µW/cm² UVR - ICNIRP 2004 0.00233 Rel Biol Eff Melatonin Supression 0.467 µW/cm² Blue Light Hazard 0.357 µW/cm² (76.6 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 0.0142 µW/cm² Lumen Reptil 4.88 "pseudo-lx" Vitamin D3 Degradation 0.0133 µW/cm² Actinic UV 0.0023 µW/cm² (4.94 mW/klm) Exctincition Lumisterol 17.7 m²/mol Exctincition 7DHC 14.1 m²/mol Exctincition Toxisterols 5.7 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 0.0798 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 0.00366 Leybold UVB 0.0579 µW/cm² Leybold UVA 0.14 µW/cm² Leybold UVC 4.62E-6 µW/cm² DeltaOhm UVB 0.129 µW/cm² DeltaOhm UVC 0.0156 µW/cm² Vernier UVB 0.0257 µW/cm² Vernier UVA 0.176 µW/cm² Gröbel UVA 0.183 µW/cm² Gröbel UVB 0.0304 µW/cm² Gröbel UVC -1.4E-5 µW/cm² Luxmeter 4.68 lx Solarmeter 6.4 (D3) 0.0114 IU/min UVX-31 0.136 µW/cm² IL UVB 3.35E-5 µW/cm² IL UVA 0.17 µW/cm² Solarmeter 6.5 (UVI, post 2010) 0.00299 UV-Index Solarmeter 6.2 (UVB, post 2010) 0.0521 µW/cm² (Solarmeter Ratio = 17.4) Solarmeter AlGaN 6.5 UVI sensor 0.0375 UV Index GenUV 7.1 UV-Index 0.00207 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 0.0206 W/m² Solarmeter 4.0 (UVA) 0.00289 mW/cm² LS122 (manuf.) 0 W/m² ISM400 (first guess) 0.0143 W/m² LS122 (assumption) 0.000715 W/m² ISM400_new 0.0118 W/m² Solarmeter 10.0 (Global Power) (assumption) 0.0193 W/m²