I bought everything seperately from different places, but I chose to get a Lumens Factory 320 lumen D26 lamp assembly running with 2 3.6v RCR123 batteries and a DSD charger. I am using this as a replacement for a Pelican M6 incandescent and this is now alot brighter than my Streamlight TL-3 incandescent with a clean bright beam spot and spill. I wanted to make it brighter and more useful than stock. I lose run time, but I have Cree LED lights for that purpose.