I bored out the reflector to accommodate a normal size D cell flashlight led bulb and realized it was the wrong direction as no way to effectively mount the bulb. (I suppose I could solder a couple of pins and mount the bulb through the reflector) Is there a bright bi pin bulb that will tolerate 8vdc and be focusable? I am using two A123 Lithium Iron Phosphate cells. ANR26650M1A Two cells fit nicely at a little over 7vdc. Just stretched the spring a bit. I am having a bit of trouble googling bi pin led that fit the bill.