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2. Solar-powered flashlight - Wikipedia

   en.wikipedia.org/wiki/Solar-powered_flashlight

   Solar powered flashlights (American English) or solar powered torches (British English) are flashlights powered by solar energy stored in rechargeable batteries. Most of these flashlights use light-emitting diodes lamps [ 1 ] [ 2 ] since they have lower energy consumption compared to incandescent light bulbs .

3. Need to Work in the Dark? Turn to One of These Editor ... - AOL

   www.aol.com/done-dark-turn-one-rechargeable...

   Best Overall: ThruNite TC15 V3 2403 High Lumen Rechargeable Flashlight. Best Value: Anker Bolder LC40 Rechargeable Flashlight. Best Tactical: Fenix PD36R Rechargeable Flashlight. Highest Battery ...

4. Charge cycle - Wikipedia

   en.wikipedia.org/wiki/Charge_cycle

   Each battery is affected differently by charge cycles. [2] [3] In general, number of cycles for a rechargeable battery (the cycle life) indicates how many times it can undergo the process of complete charging and discharging until failure or starting to lose capacity. [4] [5] [6] [7]

5. Electric light - Wikipedia

   en.wikipedia.org/wiki/Electric_light

   For LEDs, lamp life is defined as the operation time at which 50% of lamps have experienced a 70% decrease in light output. In the 1900s the Phoebus cartel formed in an attempt to reduce the life of electric light bulbs, an example of planned obsolescence. [37] [38] Some types of lamp are also sensitive to switching cycles.

6. Flashlight - Wikipedia

   en.wikipedia.org/wiki/Flashlight

   A flashlight or electric torch (Commonwealth English), usually shortened to torch, is a portable hand-held electric lamp. Formerly, the light source typically was a miniature incandescent light bulb , but these have been displaced by light-emitting diodes (LEDs) since the early 2000s.

7. Mechanically powered flashlight - Wikipedia

   en.wikipedia.org/wiki/Mechanically_powered...

   The best designs use a supercapacitor instead of a rechargeable battery, since these have a longer working life than a battery. This, along with the long-life light-emitting diode which does not burn out like an incandescent bulb, give the flashlight a long lifetime, making it a useful emergency light. A disadvantage of many current models is ...