How to make LEDs brighter
So you know when you pick an LED flashlight from the store the are so bright! Even though they are still using 3 volt 20mA they are hooked up to some circuit that makes them brighter than just hooking them up to 3 volts. The circuits generally include 1radical capacitor, capacitor, some transistors, some other blue barrel-looking thing, a diode (i think), and a few resistors. How is it possible to make them brighter without damaging them?
I've included a picture of the circuit. Please help me understand why this make the LEDs brighter and how I can make one.
Oh, BTW, the LED light has only two modes, ON/OFF