I got a Malkoff P7 drop-in for Maglite D-cell body and dropped it into a 5D Mag with standard alkalines. It is VERY bright, although Gene Malkoff says it is even brighter with high amperage cells like NiMH.
It also worked great with 3 CR123A cells in a 2D mag, so I ended up getting the battery adapter for 2x18650 in a 2D mag and leaving the P7 in there. It is way brighter than my DX 1x18650 light. I believe Malkoff's P7 really is 700 lumens out the front. The beam is a little ugly, because the reflector is not optimized for a 4-die emitter, but it does throw pretty well. I'll have to get some beamshots. It definitely has more throw than an M60 or even the Wildcat.
Has anyone ever modded an LED maglite with the Malkoff module? I bought 2D and 3D MagLEDs on black friday for $15 each. The reflector is much deeper than the incandescent maglites. But the light module is modified too. Current draw is about 1.6 amps on the 2D, which is too much for the low light output. A more neutral-white emitter would be appealing as well.
I rarely use my maglites, not even the P7 - I prefer the SF 6P, Malkoff MD2, or MD3 for actual carry, because the D-cell maglite is too big (fat and long). So I usually have a warm-white MD3 Wildcat in a holster, an MD2 with an M30W in another holster (or back pocket), and a Valiant with an M60W in my front pocket. The Maglites are nice to have around for when something goes bump in the night.
I'm waiting for the neutral/warm XPGs to come out before I buy more emitters.