Hi everyone. So I've been running a homebrew light system on my commuter bike, a 20W halogen MR16 powered by a 5.5aH 12V SLA battery. Other than feeling like I'm carrying a bowling ball around, the light has been amazingly bright and reliable, I can run it to almost 3 hours at a stretch.

Problem is, aside from the weight, I can't very easily move this setup between bikes. I keep the battery in one of those rectangular rear rack bags, which is also quite handy for storing my extra clothes and lunch and such. However, I recently started taking a continuing ed night class and that bag just doesn't fit books and such. I hate wearing anything more than a light messenger bag on my back while riding, so I have been coveting the rack space for bungeeing my book bag down like I used to do when I was in college. Also, I would really love to be able to take some of my other bikes out riding at night without figuring out where to put a seven pound battery.

So, can anyone suggest a good, portable LED setup that won't break the bank? I don't want to spend more than $200, and would love to spend much less than that if possible. I've been looking into homebrewing an LED setup, but that seems to be a bit beyond me technically at the moment. So far I've been really intrigued by a dual Fenix L2D flashlight system, or the Dinotte 200L. Currently leaning towards the Fenix lights, since a couple lockblocks seem easy to remove and I love the idea that they serve double duty as actual flashlights.

Any other thoughts or suggestions out there for me? I realize there are a number of threads along similar lines, but I didn't want to hijack anyone elses specific requests for info.