I've been following this thread as it gets darker and I am starting to need light in the AM. I need to upgrade to something that I can ride at high speed in the dark. (avg 15-16 mph with a max pushing 40 on my daily commute) I'm thinking something 15-20w would be good. To cut down on sourcing and running around time I'm thinking of getting a cheap light system and then swapping out to a higher output light/battery. That way I get housing, switches, mounts, wireing and battery bag. Something like this 6 volt system for $19 at Nashbar link


Plan would be to swap in like a 15w bulb and appropriate 12 volt SLA battery. Any other issues in converting from 6 volt to 12? Comments?

Or maybe just spend the $35 on this 10 watt, 6 volt SLA system, and if 10w isn't enough upgrade that one.