Thanks for the replies and ideas. Since I don't log many mtn bike miles at night, it's not really a big issue. When I do go out and hammer a night ride and I want to see my performance, I'll just keep the light on hi since it lasts 1:30 and I usually don't stay out that long. Like I said, the NR Lumina 700 is a badass light and I got it for ~$85 at Bike Tires Direct on a special so I'm not about to send it back.