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A Teenager, a Phone Battery and a Back-to-Basics Flashlight Like many teenagers, Benjamin Henry tinkered with electronics. But an ultraminimal flashlight he created five years ago, when he was 15, has become a business. The original Pak-Lite combined a single light-emitting diode with a battery salvaged from a cordless telephone and a plastic holder for 35-millimeter film. It successfully served Mr. Henry's brother as he hiked the 2,600-mile length of the Pacific Crest Trail. The Henry family now offers a much smaller yet brighter version of that flashlight through www.9voltlight.com. The Pak-Lite has evolved into a small plastic cap, with a switch and two L.E.D.'s, that snaps onto a standard 9-volt battery. Victor Henry, Benjamin's father and the chief executive of the Pak-Lite Company, said that a single battery would power the flashlight for about 1,200 hours. The Pak-Lite Basic sells for $13, but the company says it has a low-quality switch and is mostly intended for emergency use. The standard model with a better switch sells for $25. The standard Pak-Lite comes in an array of diode and plastic colors. The choices are not just a matter of style. Mr. Henry said that the military, a major customer, often buys Pak-Lites with green L.E.D.'s because the human eye is most sensitive to that color. IAN AUSTEN News Sourcehttp://www.nytimes.com
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