By request, here is a compilation graph for the 3D Mag drop-ins I've tested. I didn't include the Niteize 10mm as it's insane runtime would have skewed the graph.
Here's my impressions of the beams of each one:
Mag LED - Brightest and harshest. This has the whitest/harshest beam and is very good for illumination with few shadows. It falls off quickly within the first 30min. The best if you use your light in short bursts (5-10min) at a time.
Niteize 1W - Not as white as the Mag LED. Seemes a bit yellower/softer, although not as yellow as the TLE-1F. Seems a bit dimmer than the Mag LED, although the LUX readings say otherwise. With its good output, I'll probably switch my Mag 3Ds to this drop-in for around the house.
Terralux TLE-1F - A bit yellower/softer than the Niteize 1W. Good illumination/runtime if you need the lower output.
Hopefully this info is useful, I've had a lot of fun gathering it.
If anyone is interested, my Malkof M60LL came in yesterday and I will be testing it today in the 6P and G3L.
Later.
C.P.T.