Thinking about the heat problems in the E2e/P61 combo as made by McGizmo and This_is_nascar. Don's page suggests that a slightly larger and finned head could get rid of the heat better. Well, Surefire already makes a slightly larger, finned head--the KL1. Another possibility is a McLux head. Any chance either of these could host the P61 bulb, and would they deal with the heat better? Just a thought.