Well, I really like the Cygolite Metro 550. It's a bit under $50. I think it's a very good all around light. The battery life is only about 1:15 on high but in the daytime you wouldn't be running that mode anyway.

Or you can go with the Chinese no-name way. This is what I do, having tried a bunch of lights, this is pretty much what I use now.

$12: http://www.ebay.com/itm/271959824679

(Obviously it's not 8000 lumens. Maybe 600 or so, but that's perfectly adequate IMO)

The above comes with a pretty junky battery. It might give you close to a couple of hours of runtime, and last a few months. When that dies or you get fed up with it, I recommend:

This battery box - waterproof, empty, $10: 4X 18650 Battery Pack Water Resistant Case Storage Cover for Bike Bicycle Lamp | eBay
Four high quality Panasonic cells to go in it, $27: https://smile.amazon.com/p/B00C26OWGS

Still under $50 even if you just buy everything at once. If you can swing it that's not a bad idea, use the cheap battery the light comes with as a backup in case you lose lights on the way.