[QUOTE=VegasTriker;21144586] You probably don't need a 600 lumen helmet light. If a 100 lumen light works fine in the day, then it should be even better at night./QUOTE]

Not sure that I agree with this, since daytime vs nighttime lights are for two different purposes: daytime lights are for being seen, nighttime lights are for seeing.

100 lumens is a bit dimmer than I prefer for daytime -- but a light that is slightly brighter, and set to a flashing mode, will get drivers' attention. For riding at night, even on smooth pavement, I would want at least 500-600 lumens in order to see the road properly.