You can find leds for sale in this link - http://www.epicphysics.com/practical-physics/how-leds-work/
A brief video showing how LED lights work. LED lights work using one of the simplest light emitting diodes. This diode is silicone based. It has both a positive material and negative material sandwiched beside each other, when they are combined they create a p-n junction. This p-n junction is the area in which the light is created. The lens of the LED then refracts this light into a spherical illumination. led lights/lamps can usually be powered by 12v and are used in the auto and automotive industry. LED lights are expected to improve efficiency and light output significantly over the following number of years, they should eventually totally replace the incandescent light bulb.
