Only problem I've found with the Cygolite Dual Cross Pro NiMH is that on any of the less than max output settings, that whatever is doing the dimming of the bulbs emits RF signals that tell my wireless bike computer that I'm going about 50 mph
. I've learned to just leave the light on full blast at all times. Actually, the only reason I ever dimmed it near the end of the lighting season when I started out in darkness but finished in daylight. I would set it to 25% to save battery power. No need really, especially since it lasts for days and costs nothing to recharge.