Astro Flashlight Hack - ericsimages

New LED and resistor

This image shows the new 300mW red LED and the 1/2 watt surface mount resistor.

Use Ohms law to determine the resistance of the resistor (V-Vled=I * R)
This one is being driven conservatively at 90ma. Depending on the LED, it is possible to use a 7135 regulator (350mA). There are also many regulator circuits that may fit inside this package.