Originally Posted by
Looigi
Simply replacing the bulb in a cheap simple light isn't going to do it for you. At a minimum consider a Planet Bike blaze 1W LED headlight which can be found for around $40 and puts out ~100 lm. These have an LED and associated regulation circuitry and run on 2 standard AA batteries. This is going to be much better and probably cheaper in the end than anything you can do with the cheesy little lights you have.
Next up, and really worth it IMO, is a Lezyne Super Drive light which has a rechargeable Li Ion battery and puts out 500 lm. These can be found for ~$95.
I will take another look at the Lezyne Super Drive. Otherwise, I am focused on the Niterider 700 dual.
Edit: The Lezyne isn't bright enough. It doesn't have a wide enough arc.