can i drop a mod into a 12v ultrafire 4x 123 cell

[TITAN1833]

does anyone know if there is a cree drop in module for this flashlight appreciate any help.

 

[Strauss]

There are a few CREE drop-ins out there, one being from lighthound which is the one I purchased. I am not sure if the module will fit into the head. Also, it is rated for 3.7-9V. But you could just run 2x17670's to keep your voltage in check. So I guess all you need to find out is if any of the modules will fit inside the ultrafire head....

 

[2xTrinity]

There are a few CREE drop-ins out there, one being from lighthound which is the one I purchased. I am not sure if the module will fit into the head. Also, it is rated for 3.7-9V. But you could just run 2x17670's to keep your voltage in check. So I guess all you need to find out is if any of the modules will fit inside the ultrafire head....

I would highly recommend getting 2 17670s. Just about any regulated drop-in module should be able to handle that, including the ones for ~14 from Dealextreme. 2 17670s will be the same dimensions as the 4 CR123s. Even if there's a regulator that can handle 12+ volts, DC converters are inevitably more efficient when the input voltage is closer to the output as there's less "converting" that needs to be done to it. Also, 17670s should have slightly more usable energy content than 4 CR123s (less space taken up with packaging etc) so both of these facts will lead to better runtimes even assuming you find something to work on 12V (although a 3-emitter module would be nice )

Also, with four lithium cells in series -- especailly unprotected cells that won't stop themselves if their voltage drops too low -- you can run into problems if one is bad, and undergoes a cell reversal -- that is, the other batteries try to charge it while it's still running inside the circuit. If left unchecked a cell reversal can cause a nasty fire.

 

[roadie]

else u can always run via 3 Cree instead of one .......
( in serial ) with what is fellow member is doing :

http://candlepowerforums.com/vb/showthread.php?t=156803

Happy Modding .....