Pak-Lite Pilot LED Flashlight : Great emergency/hiking light; 80+ hours on the brightest setting and 1200+ HOURS on the lowest from a 9V battery at 45 grams (including alkaline battery) 38.5 grams (lithium) plus a 10 year shelf life. White and red LED. Also comes with a headband. Some folk have hiked the entire Pacific Crest Trail (2600 miles) on one battery: http://www.backwoodssolar.com/super-bright-9v-led-pak-lite & http://www.bestglide.com/pak_light_led_light.html
