I became a never used old Ion and have all maked new.
A new copper heatsink with Cree P4 led, and the head open drilled for a MCR XR reflector.
The result for the light is WOW and so nice...
Welcome to CPF. So you modified your CR2 Ion with a Seoul P4? Very nice. you left the circuit as is, so current is 350mA's to led on high? Can you post some beam shots and lux numbers?
Very nice to see your work - it looks great. How difficult was it to get the head apart? I've got a used Ion that I'd like to mod with a Cree or something brighter.