I use the Diffuser below with my Fenix PD10 (1.4 oz with battery) 190 Lumens! It is the lighter of my 2 Fenix lights, the PD30 R4 265 lumens (6 light modes) is 3 oz with baterries. This diffuser fits both, but I haven't weighed it.
http://www.fenixgear.com/flashlight/fenix_White_Diffuser_Tip.html
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