Then I’ll just burn kittens… and that fat dude down the road. J)
Why not use the tesla battery pack from the car you posted a vid of a while back?
I burned my bulb out on my porter cable tool light, replaced it with this
Make sure you select the right voltage
Bright enough and will run FOREVER on the battery pack…
In fact these will fit in 1-4 C/D cell MagLites as well 
very interesting, i wonder i one could replace that chip with an XP-L, perhaps double the lumens?
All my old incandescent flashlights have been converted to LEDs. Almost all are old Maglites.
was it cost effective to do so?
Probably not but overall I just hate ditching any nicely machined almost all aluminum flashlight. It seems such a waste.
makes sense, the body is probably better aluminum and better anodized then most chinese lights
I still have some Maglites but they are not in service (and not worth converting). 
I have about a dozen little plastic single-AA incan lights that I give to my boys as ‘training lights’. They love flashlights, but I’m still teaching them to use lights safely (they’re 3 and 5). These little incans are cheap, like $.50 each, so I don’t mind if the boys break them, and they’re less than a lumen on a fresh battery so they can’t hurt themselves if they use the light wrong. They only get to use my LED lights on moonlight mode, and carefully supervised. For now, anyway.
Oh and I still have a Mag 2-D ROP. I have a few other Maglights left, but they all have LED conversions.
I’ve got several Surefire E2’s(a couple modded with LED’s), an M6(MN15), a pair of A2’s(incan/led hybrid), plus a couple of hotwire setups(1331 & 1185) in Solarforce hosts, plus a few p60-style incan dropins in various voltages, and I think I’ve got a 3D generic incan(not sure where it is).
drillbit
There are still quite a few around the house. Most just cheapy plastic things other people have/use.
I still have my MagCharger which I use.
tesco and unknown brand light
tesco 2xaa is terrible
but the unknown brand light is waterproof down to 7m and floats (even when it is not claimed to do diving)
great beam profile on that with less to no rings or artifacts
I like to collect interesting flashlight.
Still keeping OSRAM Dulux Mini. Mod it to use either AA or D size battery with external D-Size adaptor.
I have this Osram Dulux Mini Combo but forget where I put it.
The BIG brother - Osram Dulux Combo, using 4 x AA. I feed it with Eneloop and keep in my car. Also have the rechargeable version which I keep at home.
I have a bunch of old non-LED flashlights around. I no longer use any of them anymore though most still work:
1xAAA grey maglite solitaire. 2 lumens! Focus adjustment from “spot” to “donut”.
2xAAA black mini maglite. A much more useful incan flashlight than the solitaire
2xAA blue mini maglite.
4xAA UKE dive light
4xC UKE dive light (quite well built actually. Was awesomely bright compared to what was available when I got it 20+ years ago).
Various other cheapie unknown brand plastic lights:
small fluorescent powered by I think 4xAA from Radio Shack.
3xC combo fluorescent with incandescent.
4xAAA combo fluorescent with incandescent from Sharper Image or Brookstone.
I have one non-LED light .
A 2C Mag that uses 3 123 Batteries in a sleeve made out of heater hose and a halogen bulb intended for a 5 cell Mag .
It throws a nice , white , 100% CRI beam quite well .
Poor man's hotwire .
I would love to own a regulated incan. But it seems very few models were made and they were/are expensive!
Is there any reason you couldn’t use a LED driver on an incan bulb? Assuming V and A were suitable and it it’s some kind of constant current rather than PWM?
All of my collections are using LED except this one,
I have an old 2 D MAG, i got when i did my UN service during the Balkan war, i rarly use it, but it is always by my bed ready for “service”. If i had the skills i would probaly give it a MT-G2 mod. But i am just up to that yet, just finished a JAX Mini C8, nothing fancy just a 7135*8 and a XM-L2 3C tint, 2.8 amps at the tailcap on max.