i have 5 ultrafire 501b's 3 x P4 sku:6090 2 x Q5 sku:11622 1 x R2 sku:11836

Romisen RC-M4 3V~8V Cree 1-Mode Flashlight (2xCR123/1x18650)

Price: $17.30
http://www.dealextreme.com/details.dx/sku.7934

is a good host to with a better finish than the ultrafires

solarforce L2 is a good P60 host but you have to wet and dry the barrel abit to fir protected 18650 cells, but protected ultrafire 17670 cells fit as do protected rcr123's

i am abit of a flashaholic smile

fenix are ment to be bring out an 18650 light. till then the Derelights are my preffered carry.

1S(1-stage) cree XR-E Q5 module
Input Range: 2.8~4.2V
Output Range: 1.2A
Battery Type: 1x18650,1x17670
Features:
constant output at it's fully input range
over discharge protection
$32

http://www.dereelight.com/module-list.htm

an outstanding module