Battery life is determined by brightness and the size of the batteries. If small size is an issue -- as it naturally would be with a personal light --
LED keychain light are clearly the way to go. Some LED lights will give ten hours of illumination from one AA cell. The small quarter-size keychain light on the left of the photo gives light suitable for changing a tire and similar tasks for about 2 hours, then diminishes slowly while still producing useable light for many hours thereafter. The two in the middle use single AA cells for about 10 hrs at maximum brightness. The one on the right requires 2 AAA’s for a full 1/2 watt of power and a battery service life of five hours plus. If you want a bright spotlight, you will have to settle for an incandescent bulb. Some lights come with LED’s for close work, and high-powered Krypton bulbs for long distances.
LED keychain light wholesale tend to cost more than two specialized lights would cost combined, but may be the answer for motorists, campers, security and law enforcement personnel, and others who need versatility combined with a handy unit.
The light to the left of the quarter has more than a thousand hours on its LED, and is still putting out light equivalent to when it was new. Compare it with the two brand-new lights on the right.
LED flashlight wholesale are well on the way to replacing incandescent bulbs for most applications that do not require extreme range or intense light.
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