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It was my boy finding this classic flashlight and asking me to make it works. Replacing the batteries with new ones didn't make it work. Then I took it apart, saw that the bulb's flashing wire had broken. Searching all around (my house) I couldn't find a replacement bulb. Seeing two AA batteries (3V) made me think of replacing it with a white LED. Why not? I have plenty of them around ^_^

Step 1: Parts and Tools

Parts :

  • A classic 2 x AA battery flashlight.
  • A white LED.
  • 2 cm of small cable [18-22 AWG will do]. We need its jacket only.

Tools :

  • Wire cutter.
  • Solder.
  • A small head screwdriver.
  • Hot glue [optional].
  • File [optional].

Step 2: Get the Bulb Base

Take off the bulb from its base. It is small and fragile. You just need to move it left-right-left-right until it get loosen, then pull it out. Clean the whole base using a small screwdriver.

Step 3: Prepare the LED

Bend the cathode (-) of your LED forming 90 degrees from the anode (+) of the LED. Well, for instant, the larger piece inside the LED is cathode and the smaller piece inside is anode. So far I keep remembering LED anode-cathode in this way, because I was once wrong when using longer-shorter pins due to factory's fault. For more confirm, please connect the led directly to 3 Volts battery, it won't light up if you put it the wrong way. Then bend the pin connected to the negative (-) of battery just like the photo above.


Get a small piece of wire, we need its jacket only, any wire whose jacket fit the LED pin. Pull out the wire strands, then put the LED anode (+) pin in it. This is to avoid shorting to the negative base.


Now bend the cathode (-) pin down to the former bulb negative solder pad then smoke it... I mean solder it there :)


We are almost done :)

Step 4: Finishing

I use clear tape to seal the border of the anode (+) pin to avoid short. Actually I intended to fill it up with hot glue to make the LED steady on its new container but at that time I couldn't find one, while the deadline given by my son was expiring that day :D

So.. I lighted it up anyway.



If you have a file handy, clean up the bulb negative contact which will be touched by the sliding switch connecting it to the negative of battery.


A happy Son, a happy Father, and an old stock brand new Flashlight ^_^

very cool ? <br>money saving idea
Thank you ^^
<p>cool very inventative :-)</p>
Thank you ^_^<br>
<p>Nice upgrade tutorial. Thanks Chienline. I am looking for the way to <strong><a href="http://streamlightstingerledguide.co/how-to" rel="nofollow">change the buld for my Streamlight Stinger LED flashlight</a></strong> but it is realy not clear as your article.</p>
Thank you. Just do my best for iBle community ^_^
been needing to do this to my old MAG light' the bulbs are just to dull, but never could figure out if I needed a resistor or not for it thank you very much great ible
Red, yellow or green led has 1.8V forward voltage , yes you need 48 ohm resistor. But for white led, it has 3.3V forward voltage. I am using 2 AA batteries (2 x 1.5 = 3V) so I don't need a resistor. If your battery voltage is more than 3.3V then you need a resistor. Here is a good explanation about led and resistor needed :)<br>http://www.evilmadscientist.com/2012/resistors-for-leds/
<p>You can use it without a resistor but you should use a resistor because without one the LED won't last long.</p>
<p>Nothing better than father overcoming an obstacle to make him &quot;shine&quot; in his child's eye- nice work dad!</p>
Daddy's way of love. Thank you ^_^
Very clever wouldn't have thought of that
Thank you. It is my boy with his deadline make this works :D
<p>Nice upgrade. LEDs make it way more efficient.</p>
Yes it is. Thank you :)

About This Instructable

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Bio: Just an ordinary person who loves #thinking and #tinkering
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