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How to Convert a Flashlight to LED

Go green and convert your energy-wasting, incandescent flashlight into a stronger, more efficient LED flashlight.


  • Step 1: Allow the connector to cool and then put the flashlight back together again. If all of your connections are correct, when you turn on the flashlight, your LED will come on. If it doesn't light, the connections may be reversed. Turn the batteries around or rewire your LED. Now you have a brighter, low-energy flashlight.
  • FACT: Incandescent light bulbs convert about 90 percent of the electricity running through them into heat, and only about 10 percent into light.
  • Step 2: Put the LED where the incandescent bulb was. Align the flat side of the LED with the negative connection -- the outside of the metal sleeve -- and solder the positive connection while holding the connector upside down. Allow the solder to pool so that it makes a strong connection to the battery's pole.
  • TIP: Use solder wick to wick away the connecting solder.
  • Step 3: Disassemble the flashlight by unscrewing the top from the handle and remove the bulb. You may need to unscrew the bulb from its base, but in most cases you can just pop the bulb out.
  • Step 4: Use your soldering iron to remove the solder connecting the incandescent bulb to its housing sleeve. Once most of the solder is off, wiggle the wire to break it free of any residual solder and pull the bulb out.
  • : Always wear gloves and safety glasses when soldering.

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