Model "Tungsten Lamp Model 2024 v4.1"
Spectrum 795: Q2400 Edit
DeleteMeasurement
| Brand |
other other |
|---|---|
| Lamp Product |
Quentins Halogen Lamp Model Based on Planck Emission, Spectral Transmission of Glass, Spectral emissivity of tungsten and different temperatures, collected by Quentin Dishman |
| Lamp ID |
Q2400 (07/2024) 2400 K filament temperature, Model "Tungsten Lamp Model 2024 v4.1" |
| Spectrometer | - |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 0 cm |
| Age | 0 hours |
| Originator (measurement) | Publication |
Database entry created:
Sarina Wunderlich
3/Jul/2024 ; updated:
Sarina Wunderlich
3/Jul/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 | ( 0.48 ; 0.42 ) | ( 0.67 ; 0.26 ) | ( 0.62 ; 0.26 ; 0.098 ) |
| CCT | 2400 Kelvin | 2400 Kelvin | 2400 Kelvin |
| distance | 0.0012 | 0.0018 | |
| 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) 100000 µW/cm² = 1000 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) 15000 µW/cm² = 150 W/m² UVB (EU) ( 280 nm - 315 nm) 0.0153 µW/cm² = 0.000153 W/m² UVB (US) ( 280 nm - 320 nm) 0.0776 µW/cm² = 0.000776 W/m² UVA+B ( 280 nm - 380 nm) 16.1 µW/cm² = 0.161 W/m² Solar UVB ( 290 nm - 315 nm) 0.0153 µW/cm² = 0.000153 W/m² UVA D3 regulating ( 315 nm - 335 nm) 0.757 µW/cm² = 0.00757 W/m² UVA (EU) ( 315 nm - 380 nm) 16.1 µW/cm² = 0.161 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 1.21 µW/cm² = 0.0121 W/m² UVA (US) ( 320 nm - 380 nm) 16 µW/cm² = 0.16 W/m² UVA1 (variant) ( 335 nm - 380 nm) 15.3 µW/cm² = 0.153 W/m² UVA1 (medical) ( 340 nm - 400 nm) 33.7 µW/cm² = 0.337 W/m² vis. UVA ( 350 nm - 380 nm) 13.1 µW/cm² = 0.131 W/m² VIS Rep3 ( 350 nm - 600 nm) 1880 µW/cm² = 18.8 W/m² VIS Rep4 ( 350 nm - 700 nm) 5050 µW/cm² = 50.5 W/m² purple ( 380 nm - 420 nm) 50.2 µW/cm² = 0.502 W/m² VIS ( 380 nm - 780 nm) 8880 µW/cm² = 88.8 W/m² VIS2 ( 400 nm - 680 nm) 4240 µW/cm² = 42.4 W/m² PAR ( 400 nm - 700 nm) 5020 µW/cm² = 50.2 W/m² tmp ( 400 nm - 1100 nm) 31000 µW/cm² = 310 W/m² blue ( 420 nm - 490 nm) 284 µW/cm² = 2.84 W/m² green ( 490 nm - 575 nm) 1020 µW/cm² = 10.2 W/m² yellow ( 575 nm - 585 nm) 191 µW/cm² = 1.91 W/m² orange ( 585 nm - 650 nm) 1670 µW/cm² = 16.7 W/m² red ( 650 nm - 780 nm) 5660 µW/cm² = 56.6 W/m² IRA ( 700 nm - 1400 nm) 47700 µW/cm² = 477 W/m² IR2 ( 720 nm - 1100 nm) 25100 µW/cm² = 251 W/m² IRB ( 1400 nm - 3000 nm) 47200 µW/cm² = 472 W/m²
Actionspectra
Erythema 0.00489 UV-Index Pyrimidine dimerization of DNA 0.0273 µW/cm² Photoceratitis 0.000442 µW/cm² Photoconjunctivitis 0 µW/cm² DNA Damage 2.43E-5 Vitamin D3 0.000534 µW/cm² Photosynthesis 3640 µW/cm² Luminosity 12600 lx Human L-Cone 2020 µW/cm² Human M-Cone 1310 µW/cm² Human S-Cone 221 µW/cm² CIE X 2040 µW/cm² CIE Y 1750 µW/cm² CIE Z 434 µW/cm² PAR 25700000 mol photons Extinction preD3 0.0882 e-3*m²/mol Extinction Tachysterol 0.373 e-3*m²/mol Exctincition PreD3 86.4 m²/mol Extinction Lumisterol 0 m²/mol Exctincition Tachysterol 1220 m²/mol Extinction 7DHC 0 m²/mol L-Cone 1950 µW/cm² M-Cone 818 µW/cm² S-Cone 311 µW/cm² U-Cone 91.7 µW/cm² UVR - ICNIRP 2004 0.00304 Rel Biol Eff Melatonin Supression 419 µW/cm² Blue Light Hazard 251 µW/cm² (19.9 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 0.000519 µW/cm² Lumen Reptil 8820 "pseudo-lx" Vitamin D3 Degradation 0.0187 µW/cm² Actinic UV 0.00304 µW/cm² (0.00241 mW/klm) Exctincition Lumisterol 3.88 m²/mol Exctincition 7DHC 0.663 m²/mol Exctincition Toxisterols 34.5 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 0.273 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 0.00242 Leybold UVB 0.101 µW/cm² Leybold UVA 12.8 µW/cm² Leybold UVC 0 µW/cm² DeltaOhm UVB 0.895 µW/cm² DeltaOhm UVC 0.0284 µW/cm² Vernier UVB 0.0049 µW/cm² Vernier UVA 7.54 µW/cm² Gröbel UVA 13 µW/cm² Gröbel UVB 0.0513 µW/cm² Gröbel UVC -2.15E-5 µW/cm² Luxmeter 11800 lx Solarmeter 6.4 (D3) 0.00756 IU/min UVX-31 1.49 µW/cm² IL UVB 0.000173 µW/cm² IL UVA 15.7 µW/cm² Solarmeter 6.5 (UVI, post 2010) 0.00163 UV-Index Solarmeter 6.2 (UVB, post 2010) 0.161 µW/cm² (Solarmeter Ratio = 99) Solarmeter AlGaN 6.5 UVI sensor 0.0252 UV Index GenUV 7.1 UV-Index 0.00668 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 474 W/m² Solarmeter 4.0 (UVA) 0.34 mW/cm² LS122 (manuf.) 853 W/m² ISM400 (first guess) 588 W/m² LS122 (assumption) 784 W/m² ISM400_new 716 W/m² Solarmeter 10.0 (Global Power) (assumption) 489 W/m²