I decided to see about getting a filter adapter for my Fenix FD-30 and after much difficulty I located them on the Fenix website. They were $7.50 each and a reviewer called them cheap and very breakable so I decided maybe to look around for another light when I came across a filter adapter from Nitecore that has the same head diameter and was available from another vendor at $3.95 each. I bit and got a red and blue one on order. If it doesn't work I'm only out $7.90+sh.