Incandescent Maglite 3D, and Maglite 2AA.
What do you do?
If they’re free, the 3D gets a 3s3p eneloop cradle made for it and one of those LED drop-in modules that I see DX ads flash at me from time to time. The 2AA has the bulb removed and is quietly slipped into the big blue bin next to the house with the three 60* arrows in a circle.
With the 2AA, leave it in plain site on the work bench as a project for later.
With the 3D, tri-bore the tube, build a 2/3A NiMH cell based high current pack, install a PHD regulator and ceramic high temp socket, a metal reflector, and borrofloat lens. Pop in a 64633 bulb with the PHD dialed up to give a regulated 17.6 volts with medium speed soft start and fire it up!
8000-8500 lumens and enough infrared radiation from the bulb to light your camp fire in ten seconds or less. Will cook bacon and eggs too!
8)
You need to make (more?) build threads...
I’m really curious what you come up with for the 2AA… I mean for a later, kind of advanced project… 
I did enjoy building a good number of high power incans and battery packs before the XML came out. Had the disease bad back then, but I’m much better now. 
Cut the AA down and do a Match-style P60. Or a triple nichia 219.
And +1 to the supercheap D mag: here’s one thread in case you’re having a hard time finding such things. My $2.24 triple emitter Mag Mod
Like ruffles said for the AA
Or one of these
For the D, just take a look at some of Old Lumens masterpieces.
You load up the 3D with D cells and then go wailing on anybody that pissed you off… J)
Thanks. I grabbed a 9W bulb for $1.50 off ebay, should be entertaining to put my novice skills to the simple test.