Halide Par38
Spectrum 744: TG-HALIDEPROT-009 Edit
DeleteMeasurement
| Brand |
other other |
|---|---|
| Lamp Product |
Halide Prototype Prototype Lamp |
| Lamp ID |
TG-HALIDEPROT-009 (11/2023) 70W PAR38 |
| 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.)
27/Nov/2023 ; updated:
Thomas Griffiths (Tomaskas Ltd.)
27/Nov/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 | ( 0.31 ; 0.32 ) | ( 0.17 ; 0.39 ) | ( 0.21 ; 0.14 ; 0.31 ) |
| CCT | 6600 Kelvin | 33000 Kelvin | 12000 Kelvin |
| distance | 0.083 | 0.1 | |
| 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) 10600 µW/cm² = 106 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) 10500 µW/cm² = 105 W/m² UVB (EU) ( 280 nm - 315 nm) 28.7 µW/cm² = 0.287 W/m² UVB (US) ( 280 nm - 320 nm) 35.4 µW/cm² = 0.354 W/m² UVA+B ( 280 nm - 380 nm) 1690 µW/cm² = 16.9 W/m² Solar UVB ( 290 nm - 315 nm) 28.7 µW/cm² = 0.287 W/m² UVA D3 regulating ( 315 nm - 335 nm) 67.7 µW/cm² = 0.677 W/m² UVA (EU) ( 315 nm - 380 nm) 1660 µW/cm² = 16.6 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 106 µW/cm² = 1.06 W/m² UVA (US) ( 320 nm - 380 nm) 1660 µW/cm² = 16.6 W/m² UVA1 (variant) ( 335 nm - 380 nm) 1600 µW/cm² = 16 W/m² UVA1 (medical) ( 340 nm - 400 nm) 2140 µW/cm² = 21.4 W/m² vis. UVA ( 350 nm - 380 nm) 1450 µW/cm² = 14.5 W/m² VIS Rep3 ( 350 nm - 600 nm) 8250 µW/cm² = 82.5 W/m² VIS Rep4 ( 350 nm - 700 nm) 9170 µW/cm² = 91.7 W/m² purple ( 380 nm - 420 nm) 1540 µW/cm² = 15.4 W/m² VIS ( 380 nm - 780 nm) 8090 µW/cm² = 80.9 W/m² VIS2 ( 400 nm - 680 nm) 6970 µW/cm² = 69.7 W/m² PAR ( 400 nm - 700 nm) 7130 µW/cm² = 71.3 W/m² tmp ( 400 nm - 1100 nm) 8310 µW/cm² = 83.1 W/m² blue ( 420 nm - 490 nm) 2170 µW/cm² = 21.7 W/m² green ( 490 nm - 575 nm) 1870 µW/cm² = 18.7 W/m² yellow ( 575 nm - 585 nm) 690 µW/cm² = 6.9 W/m² orange ( 585 nm - 650 nm) 1060 µW/cm² = 10.6 W/m² red ( 650 nm - 780 nm) 777 µW/cm² = 7.77 W/m² IRA ( 700 nm - 1400 nm) 1180 µW/cm² = 11.8 W/m² IR2 ( 720 nm - 1100 nm) 1080 µW/cm² = 10.8 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 2.27 UV-Index Pyrimidine dimerization of DNA 13.4 µW/cm² Photoceratitis 3.06 µW/cm² Photoconjunctivitis 0.0784 µW/cm² DNA Damage 0.301 Vitamin D3 6.96 µW/cm² Photosynthesis 4970 µW/cm² Luminosity 20700 lx Human L-Cone 3080 µW/cm² Human M-Cone 2590 µW/cm² Human S-Cone 1980 µW/cm² CIE X 2870 µW/cm² CIE Y 2880 µW/cm² CIE Z 3390 µW/cm² PAR 34100000 mol photons Extinction preD3 42.2 e-3*m²/mol Extinction Tachysterol 154 e-3*m²/mol Exctincition PreD3 23800 m²/mol Extinction Lumisterol 10.1 m²/mol Exctincition Tachysterol 260000 m²/mol Extinction 7DHC 12.7 m²/mol L-Cone 2600 µW/cm² M-Cone 1710 µW/cm² S-Cone 3920 µW/cm² U-Cone 4400 µW/cm² UVR - ICNIRP 2004 2.11 Rel Biol Eff Melatonin Supression 2470 µW/cm² Blue Light Hazard 2420 µW/cm² (117 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 7.25 µW/cm² Lumen Reptil 26300 "pseudo-lx" Vitamin D3 Degradation 7.4 µW/cm² Actinic UV 2.08 µW/cm² (1.01 mW/klm) Exctincition Lumisterol 13500 m²/mol Exctincition 7DHC 16100 m²/mol Exctincition Toxisterols 4950 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 49.9 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 2.12 Leybold UVB 31.6 µW/cm² Leybold UVA 1230 µW/cm² Leybold UVC 0.00846 µW/cm² DeltaOhm UVB 98.4 µW/cm² DeltaOhm UVC 8.83 µW/cm² Vernier UVB 10.7 µW/cm² Vernier UVA 655 µW/cm² Gröbel UVA 1370 µW/cm² Gröbel UVB 18 µW/cm² Gröbel UVC -0.0226 µW/cm² Luxmeter 21700 lx Solarmeter 6.4 (D3) 6.64 IU/min UVX-31 166 µW/cm² IL UVB 0.0261 µW/cm² IL UVA 1540 µW/cm² Solarmeter 6.5 (UVI, post 2010) 1.58 UV-Index Solarmeter 6.2 (UVB, post 2010) 28 µW/cm² (Solarmeter Ratio = 17.8) Solarmeter AlGaN 6.5 UVI sensor 20.9 UV Index GenUV 7.1 UV-Index 1.46 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 98.7 W/m² Solarmeter 4.0 (UVA) 24.1 mW/cm² LS122 (manuf.) 2.04 W/m² ISM400 (first guess) 70.1 W/m² LS122 (assumption) 4.15 W/m² ISM400_new 62.6 W/m² Solarmeter 10.0 (Global Power) (assumption) 89.8 W/m²