I bought a couple of C8's for two mates at work, who each wanted a flashlight for home. The C8 size reflector definitely has the advantage over a P60, which we all use at work, but the pills that come with the cheaper C8 lights are lacking if you want to up the amps a little.
I'd already ordered a couple of bronze pills for these lights, but seeing as both original pills were a different diameter, I knew one (if not both) would be different to the bronze replacements that are yet to arrive. So I had to mod them both....
Bronze C8 from FT purchased on 29th March 2013: It has an alloy pill, with the driver pressed in. The pill height was too short, was on it's last 1/2 a thread to get the LED high enough in the reflector - it actually fell out when I unscrewed the top & took the reflector out... It had a badly machined surface for the LED star - a slight trough right under the center.
I added a 1 cent (AU) copper coin sanded flat, & a thin washer under the pill shoulder, which helped raise the emitter, & also helped with heat dissipation, as the pill can now be screwed tightly down into the head. 
My first attempt at stacking some 7135's - really glad I got a thinner tip for the iron... 
Ended up putting 3 in total (one more after the pic was taken); Removed the stock 5 mode driver, added the new 1.4a single mode driver w/3 more 7135's, which ran 2.42a @ the tail.
Took a temp reading at room-temp, then after 5 mins on High. Seems to be holding up OK. 19.7 Deg/C increase. 
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Black C8 bought from MF on 28th March 2013. Came with a terrible hollow alloy pill with press-in driver. The pill was a slightly different size than the Bronze C8, & was not interchangeable. The only redeeming feature was the 20mm star seat size. I used a larger (2c AU) copper coin, re-sized & press-fitted into the hollow pill, then used a 3.5mm thick copper washer, also re-sized for a press-fit, then soldered together in place in the pill. 
The stock 5 mode driver was also on a 20mm board, but my replacement 1-mode board was only 17mm, so I had to press-fit a thin copper washer into the pill, in order to solder the smaller driver in position. The new board was also upgraded by stacking a few more 7135 chips to it, along with heavier gauge wire, giving a total of 2.44a at the tail.
I knew this one would be a little better with the heat, as it has about 3x the amount of copper in the pill area.
14.9Deg/C difference after 5 mins.
Not being 'real flashaholics', both recipients were suitably impressed by their new toys last night, after the informal unveiling at work (removing a greasy rag that was covering the lights...)
