I love my DeWalt flashlight and having multiple rechargeable batteries means I have a long life high power light to use for work or for emergencies.  My light is many years old so I picked up another set of these bulbs to replace the bulb when it blew out.  The original bulb lasted five years and I used it a lot.  These bulbs are rugged and they operate on 18/28 and 36 VDC.  They are rated to 325 lumens and they are Xenon bulbs.