I run a Niterider Lumina 650 on my helmet and an older Minewt 350 on the bars. Never on flash. I keep them pointed down for oncoming riders, but even so, last night, a guy without any lights going the other way on a pitch black MUP (Capital Crescent Trail) ran into the bushes. Felt kind of bad for him, but I was riding appropriately. I've been in his shoes before, when my batteries ran out once, and it is impossible to see in that situation. The solution is to get lights strong enough so you can see even with oncoming lights. Part of my commute is on a bike path on the left side of a road, so oncoming cars make it difficult to see. Again, I need strong enough lights for the situation.