The application that comes first to our mind as soon as we think of LED is indication. LED acts as a great indicator of data and power having entered in our electronic system. There could be no electronic device or system in the world that could exist without a power indication LED. Similarly in lost digital circuits, especially the wireless ones, always have LEDs on their path showing successful data transmission and reception.
The second application of this wonderful light is as LED matrix indicators. I have often used an LED indicator or the seven segment displays in many section which does not require a complex LCD display.
The latest use of LED has been for illumination. Because of its pluses like, low cost, low power and durability, LEDs are largely taking over in the field of illumination like torch-lights, Signals, etc. and so even I tried using LED for solar powered street light project which was successful.
One more application that I tried was using LEDs for decorative lighting wherein we tried to make a pattern of group's logo using LEDs. I have even used LEDs, especially the bright red and IR ones, for sensors and in fact, this application has been largely dominant in many of my automation related projects. Although I end up with this, there are in fact a lot more of it.
~Shanmugasivam P, Faculty/Staff, Mumbai, India
Some of the more interesting applications that I have used Light Emitting Diode (LED) for are Targeting systems. IED training Devices. Weapons Systems, Low voltage electronics prototype manufacturing. Infrared Systems. Electronic Strobe Flares. Underwater Demolition Marker's.
~JT W, Research & Development, Sunland, 91040
I have used LED's in flashlights, general interior lighting and for a perpetual energy project that I have been working on for three years now. I had an in-depth conversation with thee physicists concerning this and have made a few believers. I understand the different types of LED's that exist, how they function, and their general uses.
~Shawn W, Research & Development, Los Angeles, CA