I usually chime in with patented Richard "headed" comments when ever anyone starts talkin' "more power" ........

I've done a lot of night riding and I've owned a lot of lights. And it seems to me I feel far safer using any helmet mounted light than relying on a beam thrown out in front - no matter how powerful.

My favorite is a 300 lumen Coast - with adjustable focus. I've used 1000 lumen "real lights' with battery packs in the jersey pocket - but it just seem like overkill. But don't misunderstand - I still believe you need a good bike mounted head light - but it won't warn you of threats coming at you from around corner or of the road.