I have own 4 conventional -lrb- Krypton -rrb- bulb Maglites over the year and I have run many , many set of battery through they , especially my 2 aa maglite . I 'll just cut to the chase and say that they hit the ball out of the park with this lead version , it be fantastic . the follow observation be with fresh battery in all of the unit : - brightness : the 2 aa lead version be significantly brighter than the 2 AA Krypton bulb version . in fact the 2 aa led be nearly as bright as my 3d cell Krypton bulb maglite ! - clarity : it be no secret that traditional bulb flashlight typically project uneven light pattern with super bright and super dark area in the beam . I find this incredibly annoying and will have to play with the focus of the beam to find something usable . the lead version have this problem solve . the clarity and spread of the light be fantastic . I can flick it on to ANY setting and it be 10x better than the traditional -lrb- Krypton bulb -rrb- maglite in term of clarity and beam focus . I can tell they work a lot on this and they do a great job . - color : this be minor compare to the above , but the lead version put out a cool white beam that be easy on the eye and it seem easier to pick up detail . the conventional bulb version put out a harsher more redish \/ pink beam and after compare the two back to back the lead version be much better . - battery life : do not know yet . I hear the battery should last longer and the circuitry keep the light output up even as the battery go down in charge . Time will tell . I now plan to upgrade all my d cell version with the led upgrade kit . I be very pleased with this purchase . I have make some nasty review in the past , so this this positive review be say something . : -rrb-