This is a proof-of-concept of an LED booster based on a microcontroller switching an inductor off and on with a MOSFET.  I developed a simple circuit, eventually patented, that switched banks of LEDs off and on as needed to reduce backlight power consumption in consumer devices.  I wanted to study the amount of boost I could get, the amount of current that could be delivered, and the use of PWM to control the brightness of the LEDs.   I ran this experiment using a Basic Stamp module (one of my favorite toys).

Link to video on YouTube:  http://www.youtube.com/watch?v=N9ZBd3AcOFc

This video shows the microcontroller varying the pulse width to the inductor and thereby causing the 5VDC supply boost to vary from about 7 to 25 volts.  The maximum voltage was more than enough to light a string of 6 high power white LEDs.