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.)
6/Mar/2025
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.
WARNING: The measurement range (350 - 800 nm) is not sufficient for this evaluation! Data is only available in the range 345.562 - 799.849 nm. Results are shown anyway but should be ignored by anyone except experts.
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 ) | ( 0.49 ; 0.35 ) | ( 0.31 ; 0.34 ; 0.24 ) |
| CCT | 5300 Kelvin | 3800 Kelvin | 4600 Kelvin |
| distance | 0.022 | 0.054 | |
| 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) 3270 µW/cm² = 32.7 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) 3270 µW/cm² = 32.7 W/m² UVB (EU) ( 280 nm - 315 nm) 0 µW/cm² = 0 W/m² UVB (US) ( 280 nm - 320 nm) 0 µW/cm² = 0 W/m² UVA+B ( 280 nm - 380 nm) 80.2 µW/cm² = 0.802 W/m² Solar UVB ( 290 nm - 315 nm) 0 µW/cm² = 0 W/m² UVA D3 regulating ( 315 nm - 335 nm) 0 µW/cm² = 0 W/m² UVA (EU) ( 315 nm - 380 nm) 80.2 µW/cm² = 0.802 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 0 µW/cm² = 0 W/m² UVA (US) ( 320 nm - 380 nm) 80.2 µW/cm² = 0.802 W/m² UVA1 (variant) ( 335 nm - 380 nm) 80.2 µW/cm² = 0.802 W/m² UVA1 (medical) ( 340 nm - 400 nm) 146 µW/cm² = 1.46 W/m² vis. UVA ( 350 nm - 380 nm) 79.9 µW/cm² = 0.799 W/m² VIS Rep3 ( 350 nm - 600 nm) 2170 µW/cm² = 21.7 W/m² VIS Rep4 ( 350 nm - 700 nm) 3110 µW/cm² = 31.1 W/m² purple ( 380 nm - 420 nm) 178 µW/cm² = 1.78 W/m² VIS ( 380 nm - 780 nm) 3180 µW/cm² = 31.8 W/m² VIS2 ( 400 nm - 680 nm) 2840 µW/cm² = 28.4 W/m² PAR ( 400 nm - 700 nm) 2960 µW/cm² = 29.6 W/m² tmp ( 400 nm - 1100 nm) 3120 µW/cm² = 31.2 W/m² blue ( 420 nm - 490 nm) 719 µW/cm² = 7.19 W/m² green ( 490 nm - 575 nm) 926 µW/cm² = 9.26 W/m² yellow ( 575 nm - 585 nm) 106 µW/cm² = 1.06 W/m² orange ( 585 nm - 650 nm) 717 µW/cm² = 7.17 W/m² red ( 650 nm - 780 nm) 532 µW/cm² = 5.32 W/m² IRA ( 700 nm - 1400 nm) 160 µW/cm² = 1.6 W/m² IR2 ( 720 nm - 1100 nm) 87.7 µW/cm² = 0.877 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 0.0155 UV-Index Pyrimidine dimerization of DNA 0.00149 µW/cm² Photoceratitis 0 µW/cm² Photoconjunctivitis 0 µW/cm² DNA Damage 4.49E-5 Vitamin D3 0 µW/cm² Photosynthesis 2060 µW/cm² Luminosity 8370 lx Human L-Cone 1260 µW/cm² Human M-Cone 1030 µW/cm² Human S-Cone 550 µW/cm² CIE X 1120 µW/cm² CIE Y 1160 µW/cm² CIE Z 1060 µW/cm² PAR PPFD 139 µmol/m²/s Extinction preD3 0 e-3*m²/mol Extinction Tachysterol 0 e-3*m²/mol Exctincition PreD3 4.66 m²/mol Extinction Lumisterol 0 m²/mol Exctincition Tachysterol 85.2 m²/mol Extinction 7DHC 0 m²/mol L-Cone 1080 µW/cm² M-Cone 1160 µW/cm² S-Cone 828 µW/cm² U-Cone 389 µW/cm² UVR - ICNIRP 2004 0.0103 Rel Biol Eff Melatonin Supression 894 µW/cm² Blue Light Hazard 617 µW/cm² (73.7 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 0 µW/cm² Lumen Reptil 8270 "pseudo-lx" Vitamin D3 Degradation 0 µW/cm² Actinic UV 0.0103 µW/cm² (0.0123 mW/klm) Exctincition Lumisterol 0 m²/mol Exctincition 7DHC 0 m²/mol Exctincition Toxisterols 4.46 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 0.556 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 0.00709 Leybold UVB 0 µW/cm² Leybold UVA 53.1 µW/cm² Leybold UVC 0 µW/cm² DeltaOhm UVB 0.0151 µW/cm² DeltaOhm UVC 0 µW/cm² Vernier UVB 0 µW/cm² Vernier UVA 22.1 µW/cm² Gröbel UVA 57.6 µW/cm² Gröbel UVB -0.00511 µW/cm² Gröbel UVC 0 µW/cm² Luxmeter 8430 lx Solarmeter 6.4 (D3) 0.0222 IU/min UVX-31 1.25 µW/cm² IL UVB 0.000213 µW/cm² IL UVA 74 µW/cm² Solarmeter 6.5 (UVI, post 2010) 0.002 UV-Index Solarmeter 6.2 (UVB, post 2010) 0.0154 µW/cm² (Solarmeter Ratio = 7.71) Solarmeter AlGaN 6.5 UVI sensor 0.02 UV Index GenUV 7.1 UV-Index 0.0244 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 34.9 W/m² Solarmeter 4.0 (UVA) 1.48 mW/cm² LS122 (manuf.) 0 W/m² ISM400 (first guess) 25.5 W/m² LS122 (assumption) 1.27 W/m² ISM400_new 21.2 W/m² Solarmeter 10.0 (Global Power) (assumption) 33.9 W/m²