Elvidge, C. D., Keith, D. M., Tuttle, B. T., & Baugh, K. E. (2010). Spectral identification of lighting type and character. Sensors, 10, 3961–3988.
Spectrum 769: Elvidge2010_27 Edit
DeleteMeasurement
| Brand |
Philips Koninklijke Philips Electronics N.V. http://www.philips.com/ |
|---|---|
| Lamp Product |
MasterColor CDM 100W/940 Med ED17 CL ALTO (281352) Philips 281352 – MHC100/U/M/4K Alto 100 Watt Bulb Shape ED17, Base E26, 20000 hr, Lamp Voltage 102 V, Mercury (Hg) Content 6.1 mg, Color Code 940 [CCT of 4000K], Color Rendering Index 92 Ra8, Color Designation Deluxe Cool White, Color Temperature 4000 K, Initial Lumens 9000 Lm, Design Mean Lumens 6750 Lm |
| Lamp ID |
Elvidge2010_27 (01/2010) used in Elvidge, C. D., Keith, D. M., Tuttle, B. T., & Baugh, K. E. (2010). Spectral identification of lighting type and character. Sensors, 10, 3961–3988. . Details in ALL_bands_20100303.xls * http://www.servicelighting.com/Philips-281352-MHC100-U-M-4K-ALTO-ED17-Metal-Halide-HID-Light-Bulb * calculated from the spectrum: CCT 3610, CRI 65 * on the box: 9000 lm, 100 W Details in Metal_Halide_Lamps_20100311.xls * Ceramic Metal Halide 100W |
| Spectrometer | - |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 0 cm |
| Age | 0 hours |
| Originator (measurement) | Publication |
Database entry created:
Sarina Wunderlich
19/Feb/2024 ; updated:
Sarina Wunderlich
19/Feb/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 | ( 0.4 ; 0.39 ) | ( 0.36 ; 0.36 ) | ( 0.39 ; 0.22 ; 0.22 ) |
| CCT | 3600 Kelvin | 5700 Kelvin | 3800 Kelvin |
| distance | 0.016 | 0.076 | |
| 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) 19.8 µW/cm² = 0.198 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) 10.9 µW/cm² = 0.109 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) 0.322 µW/cm² = 0.00322 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) 0.322 µW/cm² = 0.00322 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 0 µW/cm² = 0 W/m² UVA (US) ( 320 nm - 380 nm) 0.322 µW/cm² = 0.00322 W/m² UVA1 (variant) ( 335 nm - 380 nm) 0.322 µW/cm² = 0.00322 W/m² UVA1 (medical) ( 340 nm - 400 nm) 0.647 µW/cm² = 0.00647 W/m² vis. UVA ( 350 nm - 380 nm) 0.322 µW/cm² = 0.00322 W/m² VIS Rep3 ( 350 nm - 600 nm) 6.85 µW/cm² = 0.0685 W/m² VIS Rep4 ( 350 nm - 700 nm) 9.48 µW/cm² = 0.0948 W/m² purple ( 380 nm - 420 nm) 0.89 µW/cm² = 0.0089 W/m² VIS ( 380 nm - 780 nm) 9.55 µW/cm² = 0.0955 W/m² PAR ( 400 nm - 700 nm) 8.84 µW/cm² = 0.0884 W/m² blue ( 420 nm - 490 nm) 1.4 µW/cm² = 0.014 W/m² green ( 490 nm - 575 nm) 2.53 µW/cm² = 0.0253 W/m² yellow ( 575 nm - 585 nm) 0.385 µW/cm² = 0.00385 W/m² orange ( 585 nm - 650 nm) 2.51 µW/cm² = 0.0251 W/m² red ( 650 nm - 780 nm) 1.84 µW/cm² = 0.0184 W/m² IRA ( 700 nm - 1400 nm) 4.75 µW/cm² = 0.0475 W/m² IRB ( 1400 nm - 3000 nm) 5.54 µW/cm² = 0.0554 W/m²
Actionspectra
Erythema 7.24E-5 UV-Index Pyrimidine dimerization of DNA 2.38E-5 µW/cm² Photoceratitis 0 µW/cm² Photoconjunctivitis 0 µW/cm² DNA Damage 2.76E-7 Vitamin D3 0 µW/cm² Photosynthesis 5.87 µW/cm² Luminosity 28.4 lx Human L-Cone 4.38 µW/cm² Human M-Cone 3.27 µW/cm² Human S-Cone 1.22 µW/cm² CIE X 4.08 µW/cm² CIE Y 3.95 µW/cm² CIE Z 2.19 µW/cm² PAR 43300 mol photons Extinction preD3 0 e-3*m²/mol Extinction Tachysterol 0 e-3*m²/mol Exctincition PreD3 0.0633 m²/mol Extinction Lumisterol 0 m²/mol Exctincition Tachysterol 1.19 m²/mol Extinction 7DHC 0 m²/mol L-Cone 3.93 µW/cm² M-Cone 2.18 µW/cm² S-Cone 2.18 µW/cm² U-Cone 1.71 µW/cm² UVR - ICNIRP 2004 4.82E-5 Rel Biol Eff Melatonin Supression 1.84 µW/cm² Blue Light Hazard 1.45 µW/cm² (50.9 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 0 µW/cm² Lumen Reptil 24.4 "pseudo-lx" Vitamin D3 Degradation 0 µW/cm² Actinic UV 4.82E-5 µW/cm² (0.017 mW/klm) Exctincition Lumisterol 0 m²/mol Exctincition 7DHC 0 m²/mol Exctincition Toxisterols 0.0672 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 0.00231 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 3.11E-5 Leybold UVB 0 µW/cm² Leybold UVA 0.256 µW/cm² Leybold UVC 0 µW/cm² DeltaOhm UVB 1.12E-5 µW/cm² DeltaOhm UVC 0 µW/cm² Vernier UVB 0 µW/cm² Vernier UVA 0.128 µW/cm² Gröbel UVA 0.269 µW/cm² Gröbel UVB -4.44E-5 µW/cm² Gröbel UVC 0 µW/cm² Solarmeter 6.4 (D3) 9.71E-5 IU/min UVX-31 0.0108 µW/cm² IL UVB 1.11E-6 µW/cm² IL UVA 0.318 µW/cm² Solarmeter 6.5 (UVI, post 2010) 1.04E-5 UV-Index Solarmeter 6.2 (UVB, post 2010) 9.46E-5 µW/cm² (Solarmeter Ratio = 9.07) Solarmeter AlGaN 6.5 UVI sensor 9.17E-5 UV Index GenUV 7.1 UV-Index 0.000104 UV-Index Solarmeter 10.0 (Global Power) 0.148 W/m² Solarmeter 4.0 (UVA) 0.00654 mW/cm² LS122 0.048 W/m² ISM400 0.135 W/m²