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| Solar-powered flashlight ： ウィキペディア英語版 |
Solar-powered flashlight
Solar powered flashlights or solar powered torches are flashlights powered by solar energy stored in rechargeable batteries. Most of these flashlights use light-emitting diodes lamps since they have lower energy consumption compared to incandescent light bulbs.
== Features ==
Solar powered flashlights vary in features and capabilities. A typical solar flashlight can give useful levels of illumination on objects up to 50 metres away, and beam may be visible for much longer distances. The solar cells used for battery charging have an indefinite life expectancy. A solar powered flashlight may give several hours of light after being charged during the day.〔 These flashlights may be designed to be impact resistant, weatherproof, and to float.〔
Other models include features such as a solar cell phone charger, an AM/FM radio, or a siren to call for help in an emergency. Some models include a hand crank dynamo for charging at night. An experimental solar flashlight the size of a credit card features a white LED powered by 16 solar cells.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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