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

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

   The sweet spot for all-day battery life is about 3,000 mAh; rechargeable flashlights with batteries that are 5,000 mAh or more can provide powerful light for days at a time. Power Modes

3. Solar-powered flashlight - Wikipedia

   en.wikipedia.org/wiki/Solar-powered_flashlight

   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. [3]

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. LED lamp - Wikipedia

   en.wikipedia.org/wiki/LED_lamp

   A 230-volt LED filament lamp, with an E27 base. The filaments are visible as the eight yellow vertical lines. An assortment of LED lamps commercially available in 2010: floodlight fixtures (left), reading light (center), household lamps (center right and bottom), and low-power accent light (right) applications An 80W Chips on board (COB) LED module from an industrial light luminaire, thermally ...

6. List of battery sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_battery_sizes

   This battery, introduced in 1901, was very common in continental Europe until the 1970s. It usually contains three B cells in series. In Switzerland as of 2008, 4.5-volt batteries account for only 1% of primary battery sales. [89] PP3, 9-volt, or E [90] Radio battery Smoke alarm battery Square battery Transistor battery 006P MN1604

7. Flashlight - Wikipedia

   en.wikipedia.org/wiki/Flashlight

   By comparison, a 60-watt household incandescent lamp will produce about 900 lumens. The luminous efficacy or lumens produced per watt of input of flashlight bulbs varies over the approximate range of 8 to 22 lumens/watt, depending on the size of the bulb and the fill gas, with halogen-filled 12-volt lamps having the highest efficiency.