I did this for a hunting light - I have also done a red XP-E and XP-G2 @2.8A, three mode. All switchable in seconds.
Single mode 1.4A 3-5V 4xAMC7135 driver, regular XP-E 520-530NM emitter, regular empty p60 pill and some thermal adhesive.
I'm very happy with the throw. The only issue is that the standard M3 pill is deeper so you need longer contact springs or a spacer to ensure proper contact using a shorter P60 pill. And of course this will fit in any of my P60 hosts by adding a normal P60 reflector.
For comparison, the red unit:
Single mode 1.4A 3-5V 4xAMC7135 driver, regular XP-E 520-530NM emitter, regular empty p60 pill and some thermal adhesive.
I'm very happy with the throw. The only issue is that the standard M3 pill is deeper so you need longer contact springs or a spacer to ensure proper contact using a shorter P60 pill. And of course this will fit in any of my P60 hosts by adding a normal P60 reflector.
For comparison, the red unit: