I started night riding and racing 24hr endurance races in the late 90s. Our team was sponsored by NR for a few years and I grew accustomed to having an HID on both the head and the bars. One of those HIDs saved my bacon when the headlights in the FJ40 died on me in the middle of the night in the backwoods of North Carolina, but that's a "Deliverance" story for another thread....
I'm no longer racing -and therefore no longer sponsored- but I still love riding at night and still like having a good amount of light. A couple of my favorite night runs here in Oregon are shuttled downhill trails where you pick up some serious speed.
I've now completely switched to LED flashlights with rechargeable 18650 batteries. I run a 900 lumen pencil beam on my head and a 1600 lumen wide beam on my bars. I keep an extra flashlight and extra batteries in my pack for backup. I source the lights, batteries, battery charger, and mounting accessories throuh Deal Extreme from Hong Kong. SHipping is often slow (really slow around Chinese New Year!!!) but I've been happy with the quality and price.
Hope that helps.
.matthew