Petzl's Micro is one of the few headlights that uses AA batteries. AA batteries last up to 3 times longer than AAA for the same price that you are paying. Original Micro uses a single 3.7v filament bulb for illumination. It is considered quite bright .... if you are still stuck in 1980s. I will be upgrading this expired light so that it is still valid for use in this era of high-powered LEDs.
You would need:
1) Petzl Micro
2) LED driver (I use 1.5v - 3v driver I got from DX)
3) LED on 20mm star (I use XP-G R2 I got from ebay)
4) spring (I got it from a disused flashlight)
5) some thin multi strand wires that is flexible (mine's from an old earphone)
6) plastic cutter
7) abrasive papers (80 & 200 that is what I have)
9) some silicone based glue, Goop, E6000 etc.
10) patience and lots of common sense as you will be working with sharp and extremely hot tools which will be dangerous if you have lost your senses, physically and mentally.
Step 1: Disassemble the Unit.
The reflector and lens unit is a bit tricky. You have to use some persuasion skills (ie.brute force) to get them to separate.
Step 2: Paring Down the Reflector.
Step 3: Preparing the Light's Body.
1) Cut off the protruding part from the battery housing.
2) Cut off the bulb holder and the metal contact right down to the base.
3) File it down with the rotary tool if you need it to look neat. But of course, this step is optional.
All the parts removed will look something like this.
Step 4: Engine & Emitor.
Step 5: Final Assembly.
Do not forget to solder the negative wire to the battery housing unit's contact after the glue has dried. Assemble everything back together, insert the battery and test.
Step 6: Beamshot.
Second picture compares between 2 Tikka XPs on High mode without the diffuser on. The one on the right is original unmodified with it's Luxeon Rebel LED. On the left is modified with XP-G.
Third picture shows the Tikka XP with diffusers on.
Fourth picture shows the XP-G modified on Boost mode.
Last words: Do not waste your time and money to modify your Tikkas with XP-G. It does not go well with the original lens set-up. Use SSC-P4 or XR-E instead, they will provide better throw and nicer beam. Better still, get a Micro to modify, you will not regret it.