Please note: this was made a couple years ago. Some of my friends have bought even cheaper lights on Amazon:
This is a review of a 4000 lumen bike light I bought on Ebay which is superior to my Exposure MaxX-D and Exposure Diablo at 1/5 or less the price.
Someone pointed out you can find lights like this on Amazon.com for $40. Just search Amazon for 4000 Lumen Bike Light!
For run-times, click this link:
This light has a unique feature. After about 1 hour, it goes into a very fast strobe mode which you can’t see, but a camera can. This gives this particular light about a 5.5 to 6 hour run time on high which is crazy long. However, if you want to video a ride, this could be a problem.
I have another cheap light like this that doesn’t do strobe and only lasts about 2 hours.
I have no idea how to tell from either of the ebay listings which kind of light you’re getting.