awilder,
Welcome to CPF!
In my opinion, the best LED drop-in's for the Surefire 6P are made by
Malkoffdevices because of their quality, heat sinking and customer service. That being said, there are also many other brands to choose from.
I think you have two options.
Option 1. Get a
Surefire FM34 beam diffuser for your 6P. It can be used with your stock P60 lamp or any LED drop in you get.
Option 2. Buy a Malkoff MD2 with the high/low ring option. The MD2 works like a Surefire 6P. Every time you hit the tailcap the high level comes on. This is important for LE work so you are never left guessing if high or low will come on. The only way to get the low level is to manually turn/rotate the bezel a bit (loosen it a bit). Then every time you hit the tail cap only the low level will come on which is useful for time you are not under stress and just want a low level of light for closeup work. Rotate the bezel back (tighten it) and your light is "fixed " on high again.
I don't know if a Surefire P60 lamp will work in a MD2. For the best throw, Malkoff's now discontinued M60 LED (Cree XR-E LED) is best. His current version, the M61 (Cree XP-
G LED), is a much more fine balance of throw and spill. You can still find the Malkoff M60 at
Oveready. You may find you like the new M61 better as you get better peripheral vision with it but give up a bit of throw.
Go to this
Malkoff Tint Comparison Tool to see the difference between your stock P60 and the Malkoff M61. Put your mouse curser over one of the small pictures and it will show in the larger picture. These comparisons are on the high level only.