High Fidelity Speakers utilize LED as light source. .

Intended for indoor wall-mount applications, Exceder LED Speakers and Speaker Strobes feature 300–8,000 Hz frequency response for clear voice messages and tone signaling in emergency communications, mass notification, and voice evacuation applications. Products use LED as strobe light source and incorporate high-efficiency optics, minimizing current draw.

[source: http://news.thomasnet.com/fullstory/High-Fidelity-Speakers-utilize-LED-as-light-source-20006559]

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