Model "Tungsten Lamp Model 2024 v4.1"
Spectrum 799: Q2900 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 |
Q2900 (07/2024) 2900 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 | ( 0.44 ; 0.41 ) | ( 0.59 ; 0.29 ) | ( 0.51 ; 0.29 ; 0.14 ) |
| CCT | 3000 Kelvin | 2900 Kelvin | 3000 Kelvin |
| distance | 0.0018 | 0.0023 | |
| 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) 25800 µW/cm² = 258 W/m² UVB (EU) ( 280 nm - 315 nm) 0.16 µW/cm² = 0.0016 W/m² UVB (US) ( 280 nm - 320 nm) 0.792 µW/cm² = 0.00792 W/m² UVA+B ( 280 nm - 380 nm) 111 µW/cm² = 1.11 W/m² Solar UVB ( 290 nm - 315 nm) 0.16 µW/cm² = 0.0016 W/m² UVA D3 regulating ( 315 nm - 335 nm) 6.95 µW/cm² = 0.0695 W/m² UVA (EU) ( 315 nm - 380 nm) 111 µW/cm² = 1.11 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 10.6 µW/cm² = 0.106 W/m² UVA (US) ( 320 nm - 380 nm) 110 µW/cm² = 1.1 W/m² UVA1 (variant) ( 335 nm - 380 nm) 104 µW/cm² = 1.04 W/m² UVA1 (medical) ( 340 nm - 400 nm) 205 µW/cm² = 2.05 W/m² vis. UVA ( 350 nm - 380 nm) 86.2 µW/cm² = 0.862 W/m² VIS Rep3 ( 350 nm - 600 nm) 5320 µW/cm² = 53.2 W/m² VIS Rep4 ( 350 nm - 700 nm) 11400 µW/cm² = 114 W/m² purple ( 380 nm - 420 nm) 258 µW/cm² = 2.58 W/m² VIS ( 380 nm - 780 nm) 17400 µW/cm² = 174 W/m² VIS2 ( 400 nm - 680 nm) 9830 µW/cm² = 98.3 W/m² PAR ( 400 nm - 700 nm) 11200 µW/cm² = 112 W/m² tmp ( 400 nm - 1100 nm) 43700 µW/cm² = 437 W/m² blue ( 420 nm - 490 nm) 1050 µW/cm² = 10.5 W/m² green ( 490 nm - 575 nm) 2760 µW/cm² = 27.6 W/m² yellow ( 575 nm - 585 nm) 446 µW/cm² = 4.46 W/m² orange ( 585 nm - 650 nm) 3490 µW/cm² = 34.9 W/m² red ( 650 nm - 780 nm) 9380 µW/cm² = 93.8 W/m² IRA ( 700 nm - 1400 nm) 52700 µW/cm² = 527 W/m² IR2 ( 720 nm - 1100 nm) 31000 µW/cm² = 310 W/m² IRB ( 1400 nm - 3000 nm) 35900 µW/cm² = 359 W/m²
Actionspectra
Erythema 0.0364 UV-Index Pyrimidine dimerization of DNA 0.261 µW/cm² Photoceratitis 0.00463 µW/cm² Photoconjunctivitis 0 µW/cm² DNA Damage 0.000207 Vitamin D3 0.00559 µW/cm² Photosynthesis 7930 µW/cm² Luminosity 30300 lx Human L-Cone 4750 µW/cm² Human M-Cone 3330 µW/cm² Human S-Cone 832 µW/cm² CIE X 4560 µW/cm² CIE Y 4220 µW/cm² CIE Z 1600 µW/cm² PAR 56100000 mol photons Extinction preD3 0.872 e-3*m²/mol Extinction Tachysterol 3.67 e-3*m²/mol Exctincition PreD3 788 m²/mol Extinction Lumisterol 0 m²/mol Exctincition Tachysterol 10900 m²/mol Extinction 7DHC 0 m²/mol L-Cone 4430 µW/cm² M-Cone 2470 µW/cm² S-Cone 1240 µW/cm² U-Cone 501 µW/cm² UVR - ICNIRP 2004 0.0219 Rel Biol Eff Melatonin Supression 1460 µW/cm² Blue Light Hazard 946 µW/cm² (31.2 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 0.00543 µW/cm² Lumen Reptil 22900 "pseudo-lx" Vitamin D3 Degradation 0.184 µW/cm² Actinic UV 0.0219 µW/cm² (0.00722 mW/klm) Exctincition Lumisterol 38.9 m²/mol Exctincition 7DHC 6.79 m²/mol Exctincition Toxisterols 300 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 2.29 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 0.0197 Leybold UVB 0.986 µW/cm² Leybold UVA 87.5 µW/cm² Leybold UVC 0 µW/cm² DeltaOhm UVB 7.98 µW/cm² DeltaOhm UVC 0.281 µW/cm² Vernier UVB 0.0513 µW/cm² Vernier UVA 54.8 µW/cm² Gröbel UVA 90.5 µW/cm² Gröbel UVB 0.464 µW/cm² Gröbel UVC -0.000225 µW/cm² Luxmeter 29100 lx Solarmeter 6.4 (D3) 0.0615 IU/min UVX-31 12.4 µW/cm² IL UVB 0.00146 µW/cm² IL UVA 106 µW/cm² Solarmeter 6.5 (UVI, post 2010) 0.0145 UV-Index Solarmeter 6.2 (UVB, post 2010) 1.54 µW/cm² (Solarmeter Ratio = 106) Solarmeter AlGaN 6.5 UVI sensor 0.239 UV Index GenUV 7.1 UV-Index 0.0491 UV-Index Solarmeter 10.0 (Global Power) (manuf.) 655 W/m² Solarmeter 4.0 (UVA) 2.12 mW/cm² LS122 (manuf.) 786 W/m² ISM400 (first guess) 782 W/m² LS122 (assumption) 726 W/m² ISM400_new 923 W/m² Solarmeter 10.0 (Global Power) (assumption) 673 W/m²