This mod is provided by Bill A. He has added a Luxeon Star to an Energizer headlamp with the addition of some regulator circuitry. I'll let Bill describe the work in his own words:

I've been following the CPF forums for a while, and decided to do a mod for myself. Please feel free to add it to your excellent web page.

I took an inexpensive Eveready Headlamp, (less than $10 at the Home Depot) and replaced the existing lamp and reflector with a LS mounted on a .1" aluminum heat sink ground to fit the reflector cavity which is about 2" in diameter I used heat sink grease beneath the LS to aid in removing whatever heat it generates. Initially I used a resistor to limit the current, but wanted a regulator circuit, preferably a switcher that would give me decent efficiency.

I followed the CPF forums to see what others were using, and read most of the posts on the zetec chip. After some research around the Maxim site, I decided to try using the Max750 chip which is an 8pin dip. The chip has a built in FET switch, and adjustable voltage output. The 8pin dip package is much easier to breadboard, than surface mount devices. The headlamp uses 4AA batteries so I looked for a step down regulator as opposed to the more common step up type others were using. BTW, Maxim is great for providing free samples and literature to anyone that asks.

Using an adjustable power supply, I was able to check output regulation which was excellent, from about 3.9V up to 6. Below 3.9V the output starts to droop, and at about 3.75 the regulator shuts down. The circuit is the same as the reference circuit listed in the Maxim data sheet, with the exception of the inductor and output voltage divider. I used 2 10uh chokes in series (look like blue resistors), and I used a 50K pot with the center wiper connected to the feedback pin. A 100uf electrolytic provides input filtering, and a 100uf tantalum provides output filtering with low esr for better efficiency. At about 5.5V I calculated a little more than 84% efficiency, good enough for me.

I compared light output with that of a recently acquired Inova X5, a nice light also. The LS beam is warmer, brighter, and broader.

Many thanks to Bill A. for sharing this mod with FlashlightReviews.com!