http://quazen.com/shopping/consumer-electronics/how-to-design-your-own-led-strobe-light/

Ever since the introduction of the LED [light emitting diode] to the general lighting industry, we have been witnessing more and more diverse applications of their use.One of the first has been their use in traffic control lighting and now emergency lighting is finding many uses. This article shows you how you can design and build your own.

http://quazen.com/shopping/consumer-electronics/how-to-design-your-own-led-strobe-light/