Model "Tungsten Lamp Model 2024 v4.1"
Spectrum 798: Q2800 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 |
Q2800 (07/2024) 2800 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 | ( 0.45 ; 0.41 ) | ( 0.6 ; 0.29 ) | ( 0.53 ; 0.28 ; 0.14 ) |
| CCT | 2900 Kelvin | 2800 Kelvin | 2800 Kelvin |
| distance | 0.0017 | 0.0017 | |
| 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) 23500 µW/cm² = 235 W/m² UVB (EU) ( 280 nm - 315 nm) 0.107 µW/cm² = 0.00107 W/m² UVB (US) ( 280 nm - 320 nm) 0.535 µW/cm² = 0.00535 W/m² UVA+B ( 280 nm - 380 nm) 80.2 µW/cm² = 0.802 W/m² Solar UVB ( 290 nm - 315 nm) 0.107 µW/cm² = 0.00107 W/m² UVA D3 regulating ( 315 nm - 335 nm) 4.78 µW/cm² = 0.0478 W/m² UVA (EU) ( 315 nm - 380 nm) 80.1 µW/cm² = 0.801 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 7.35 µW/cm² = 0.0735 W/m² UVA (US) ( 320 nm - 380 nm) 79.6 µW/cm² = 0.796 W/m² UVA1 (variant) ( 335 nm - 380 nm) 75.3 µW/cm² = 0.753 W/m² UVA1 (medical) ( 340 nm - 400 nm) 151 µW/cm² = 1.51 W/m² vis. UVA ( 350 nm - 380 nm) 62.7 µW/cm² = 0.627 W/m² VIS Rep3 ( 350 nm - 600 nm) 4450 µW/cm² = 44.5 W/m² VIS Rep4 ( 350 nm - 700 nm) 9910 µW/cm² = 99.1 W/m² purple ( 380 nm - 420 nm) 196 µW/cm² = 1.96 W/m² VIS ( 380 nm - 780 nm) 15500 µW/cm² = 155 W/m² VIS2 ( 400 nm - 680 nm) 8510 µW/cm² = 85.1 W/m² PAR ( 400 nm - 700 nm) 9770 µW/cm² = 97.7 W/m² tmp ( 400 nm - 1100 nm) 41100 µW/cm² = 411 W/m² blue ( 420 nm - 490 nm) 845 µW/cm² = 8.45 W/m² green ( 490 nm - 575 nm) 2330 µW/cm² = 23.3 W/m² yellow ( 575 nm - 585 nm) 387 µW/cm² = 3.87 W/m² orange ( 585 nm - 650 nm) 3090 µW/cm² = 30.9 W/m² red ( 650 nm - 780 nm) 8630 µW/cm² = 86.3 W/m² IRA ( 700 nm - 1400 nm) 51900 µW/cm² = 519 W/m² IR2 ( 720 nm - 1100 nm) 30000 µW/cm² = 300 W/m² IRB ( 1400 nm - 3000 nm) 38200 µW/cm² = 382 W/m²
Actionspectra
Erythema 0.0258 UV-Index Pyrimidine dimerization of DNA 0.178 µW/cm² Photoceratitis 0.00311 µW/cm² Photoconjunctivitis 0 µW/cm² DNA Damage 0.000144 Vitamin D3 0.00375 µW/cm² Photosynthesis 6940 µW/cm² Luminosity 26200 lx Human L-Cone 4110 µW/cm² Human M-Cone 2850 µW/cm² Human S-Cone 665 µW/cm² CIE X 3980 µW/cm² CIE Y 3640 µW/cm² CIE Z 1280 µW/cm² PAR 49100000 mol photons Extinction preD3 0.592 e-3*m²/mol Extinction Tachysterol 2.5 e-3*m²/mol Exctincition PreD3 542 m²/mol Extinction Lumisterol 0 m²/mol Exctincition Tachysterol 7540 m²/mol Extinction 7DHC 0 m²/mol L-Cone 3860 µW/cm² M-Cone 2050 µW/cm² S-Cone 983 µW/cm² U-Cone 376 µW/cm² UVR - ICNIRP 2004 0.0156 Rel Biol Eff Melatonin Supression 1180 µW/cm² Blue Light Hazard 756 µW/cm² (28.9 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 0.00364 µW/cm² Lumen Reptil 19400 "pseudo-lx" Vitamin D3 Degradation 0.125 µW/cm² Actinic UV 0.0156 µW/cm² (0.00598 mW/klm) Exctincition Lumisterol 26.3 m²/mol Exctincition 7DHC 4.58 m²/mol Exctincition Toxisterols 208 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 1.6 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 0.0138 Leybold UVB 0.671 µW/cm² Leybold UVA 63.2 µW/cm² Leybold UVC 0 µW/cm² DeltaOhm UVB 5.51 µW/cm² DeltaOhm UVC 0.191 µW/cm² Vernier UVB 0.0344 µW/cm² Vernier UVA 39.2 µW/cm² Gröbel UVA 65.1 µW/cm² Gröbel UVB 0.319 µW/cm² Gröbel UVC -0.000151 µW/cm² Luxmeter 25000 lx Solarmeter 6.4 (D3) 0.043 IU/min UVX-31 8.63 µW/cm² IL UVB 0.00102 µW/cm² IL UVA 76.9 µW/cm² Solarmeter 6.5 (UVI, post 2010) 0.01 UV-Index Solarmeter 6.2 (UVB, post 2010) 1.05 µW/cm² (Solarmeter Ratio = 105) Solarmeter AlGaN 6.5 UVI sensor 0.163 UV Index GenUV 7.1 UV-Index 0.0349 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 619 W/m² Solarmeter 4.0 (UVA) 1.56 mW/cm² LS122 (manuf.) 802 W/m² ISM400 (first guess) 745 W/m² LS122 (assumption) 740 W/m² ISM400_new 884 W/m² Solarmeter 10.0 (Global Power) (assumption) 637 W/m²