Just get one of these 1200 lumen lights from Amazon. I had one for 2 years and man it's bright. I run my light on low and cars still flashed me their hi beams.

Amazon.com : SUPERNIGHT(TM) CREE XML T6 LED Gold Bike Headlight Headlamp Bicycle Light With Rechargeable 4400mAh Battery, 1200 LM, Waterproof(IP66), for Cycling, Riding, Hunting, Camping, Traveling, Hiking, Caving, Climbing (Black+Golden) : Sports &