Something bright from Deal Xtreme or Amazon for about £15-30 will do the job, so long as you don’t mind the risk of poor batteries and/or exploding chargers.
Lots of people use them, some have problems, others don’t. Some people buy them and budget for a new battery and charger just for peace of mind.
I posted a link to some great value Moon lights on offer on Merlin the other day, that got pretty well shot down in flames for being expensive…..
http://www.merlincycles.com/moon-xp1500-front-light-55101.html
I’ve just got hold of a set and they are great. Well made and very bright. A friend of mine has been using them for a year with no issues.
In the original thread, I offered to take some beam shots, but seeing as no one was interested I didn’t bother. If you want, I can do some shots this evening and post them up…