Thinking more on it, the only safe way I could see to use a light on a revolver would be to use a corded pressure pad. Problem there is I could see that cord hanging up on something plus there is not a lot of real estate to mount the pad to. I mostly don't have weapon lights on my handguns - I don't want to invest in all new holsters. If heading outside at night I put a Fenix PD35 flashlight in my pocket. I do have weapon lights on my Home Defense AR15 and 1 of my AK47's also kept for HD.