Pricey, but works as advertised - SureFire Diffuser for 1.125in Diameter Bezels

Bizarrely pricey. Not blaming optics planet as it is weirdly expensive on the surefire site as well. The 1" version is like 15 bucks less for some reason. Works well though. I bought it so my 500 lumen m600u wouldn't be quite as blinding indoors and it achieves that.

Diffused the super bright center of the beam. When shined in a small room almost makes it look like you turned on an overhead light vs using a flashlight. Great for less intense/blinding light out of a powerful flashlight indoors or around reflective surfaces. Doesn't destroy your night vision quite as thoroughly as using a 500 lumen light in diffused indoors.

Wish they had a flip up model like they do for other size bezels though so it would be easier to remove when outside (where the 500 lumens is actually useful, I really don't need more than 200 in my house but live in a rural area where having more is useful outdoors). 5 stars for function, 3 for price, though I would give a flip up type 5 stars for the price