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Blue headset: Speaker: 40mm drive unit
Red one headset: cable material:2.5/4C PVC enameled wire
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Optics for color mixing
For white-light illumination, the appropriate output can be achieved by combining the output of discrete color emitters and/or using static white-light LEDs. There are a large number of ways that effective color mixing can be accomplished, including:
No optics: the LEDs are oriented such that their outputs overlap at the target; with this approach, there is no control of the illuminance distribution at the target.
Individual optics: employs separate optics for each of the LEDs.
Group optic: employs a common optic for a group of LEDs.
Combination optic: employs individual or group optics whose outputs are then coupled into a final common optic.
Dichroics: technique that employs dichroic filters to improve the mixing into a common optic.
The system can be radically altered, and potential problems can be circumvented. The system can be radically altered, and potential problems can be circumvented.
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This article was published in the November/December 2007 issue of LEDs Magazine.
To read the full version of this article, please visit our Magazine page, where you can download FREE electronic PDF versions of all issues of LEDs Magazine.
You can also request a print copy of LEDs Magazine (available by paid subscription) and sign up for our free weekly email newsletter . About the Author Ryan Williamson is with Philips Solid State Lighting Solutions ( ) and John Koshel is with Lambda Research Corp. () and the College of Optical Sciences at the University of Arizona. December 2007 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2004 2005 2006 2007 2008 2009
Frequency response: 20-20KHz
Plug diameter :3.5mm
Cable length:1.2m
Type:headset
PVC 2.0/4C(8*0.08)cable L=140CM
weight:146g/216g
Sensitivity: 115dB
Impedance: 28 ohms
Colour: Black
cable length:1200±30mm
material:ABS +PP
Plug:3.5 four-pole vinyl 4.5 gold-plated plug stereo
Wire box function: audio controller can adjust the volume, microphone switch function
Speaker specification:40MM
Speaker Resistance:28Ω
Speaker frequency range:20Hz-20KHz
Microphone specification:6*5MM
Microphone sensitivity:-52dB
Microphone frequency response:20Hz-20KHz
weight:227g 300g with box
The use of illumination design and analysis software enables verification of the efficacy of color mixing of LEDs prior to product fabrication, saving time and expenditure, say Ryan Williamson and John Koshel. Color mixing of LEDs currently receiving a great deal of attention, especially in the Architectural lighting sector. Color mixing is the process of adding the spectral emission from several different LEDs, usually red (R), blue (B), green (G) and sometimes amber (A), to get a range of desired colors, including The different kinds of color temperatures (CCTs) of white. The goal of these systems is not only to maintain one distinct color, but also to allow the user to vary the color as desired.