i have the cygolite HID, which has plenty of light, I like the fact that it's bright, others can see me, and I can see where I'm going...it's a 12W HID, I looked into other systems, but this seems like a good deal...4hr run time 5 hour charge time...if you notice most of the time you're paying for run/charge time...I was looking at the NiMH Night Rover til I saw run/charge time....