3V~8.4V 5W Cree 5-Mode Memory Circuit Board for Flashlights (16.7mm*6.3mm)

Pros: CHEAP Moddable Works great! Did I mention cheap? This product is amazing I tell you! I tried sticking it in a sku.23653 (which I ordered from ebay and has a broken driver board) and I have to say that High is just as high as direct drive (or at least I can't tell the difference)Low is exactly what I need and Strobe seems very tactical if I do say so myself!!!

Cons: The problem with fitting it into sku.23653 is that I had to do quite a lot of dremeling to the smaller PCB to get it to fit into the brass led shell... I was super paranoid about cutting the traces or vias too short, and about them shorting against the brass shell's wall... Luckily, no such thing happened and I avoided this.. It would be nice if there was a datasheet on this product so I would know exactly where the second PCB is (it's slightly offset) and how large it is (too large for my application).

Other: If your flashlight doesn't have modes, or the modes are dead or something, GET THIS. After fussing with this 3 mode flashlight, I believe that the 5 mode one I have coming my way is going to be less than useful. High, low and strobe is all you really need in a flashlight IMO. Medium sounds like nonsense, and SOS is nice, but not necessary for an EDC flashlight. I recommend this problem if you're technically inclined enough to install it and handle any problems you may come across!

Pros: Curcuit board is as described.
The board is very easy to mod despite the fact that it came without any instructions. Memory mode works fine. All 5 modes are working nicely. The Mid and Low mode are really useful, mid being bright enough for distance throw and low being not too dim.

Cons: Board looks a little fragile. So pay a little attention when modding. Other than that, the board is okay.
The price could be slightly cheaper though.

Other: It's definitely a good buy if any of your circuit board is fried.

Pros: - It's very small and compact. - I like the high, middle and low modes - One, or two serially connected Li-ion battery cell is an accepted power source. - The memory mode is very useful.

Cons: - Strobe and S.O.S. modes is useless for me - The factory soldered cables is very thin, both cable is loosened immediately (not a big a cons, I replaced the thin cables to a thicker ones)

Other: Good, cheap driver. It's works perfectly.

Pros: - very small board - cheap - wide range of input voltage - keeps a minimal light on even when the batteries are extremely low, going into a kind of "low-strobe" mode

Cons: the memory and modes controller died after the first time I drained the batteries completely. since then it only works in HI mode

Other: I would buy this again for other DYI projects It would be nice to have better information on which driver to use for which emitter