Lego LED Flashlight




About: i like to make stuff, including(but not limited to) dangerous things

I got bored one day, so I made this. It is very bright. This is my first instructable, so give me feedback.

I made this before I made the instructable, so it might not be clear.

If you want me to start selling them on ebay, let me know.

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Step 1: Get Your Legos

you need several things for this light

-a 2x6 lego brick
-a 2x6 matching lego panel
-small flexible insulated wire
-electrical tape
-1 superbright LED (white is nice, but you can get a color to match a brick)
-a switch (i used a small toggle switch from RadioShak)
-3 LR1130 button cell batteries.

reccomended tools

-needle nose pliers
-something to make the holes in the plastic for the LED and toggle switch

Step 2: Prep the Brick

use needle nose pliers to rip the inside of the brick out.

then, using any method, make two holes in the ends of the brick. the hole for the LED should be small, and steadily make it bigger, until the LED fits snugly in the hole.

make a hole for the switch, just larger than the threads. put the switch in, and screw on one nut(or two). dont make it too tight.

Step 3: Electrical

IMAGE 1 - get two of the LR1130 button cell batteries. stack them, top to bottom. place an insulated wire, ends stripped, on top and bottom. DONT USE BARE WIRE! YOU RISK SHORTING ALL OF IT, AND RUINING YOUR LIGHT! wrap it in electrical tape

IMAGE 2 - on the left should be the stack of two batteries from image 1. run the wire coming from the top of the two to the bottom of the third. run another wire from the other end of the battery, and wrap it in electrical tape.

IMAGE 3 - very messy, so here is what you do:
1) run a wire from one of the switch terminals directly to the LED.
2) run one end of the battery pack you made to the other terminal of the switch, and the other end of the battery pack to the other LED connection.
3) flip the switch. if LED does not light, check wires to make sure there are no wires crossed anywhere. if still no light, swap the battery pack connections around so it is reversed from how it was. LEDs only light in one direction.
4) when all is correct, fit it all inside the lego brick. the batteries only fit if they are not all stacked.

Step 4: Finishing Touches

get the 2x6 lego panel you had. snap it in place. test it quick to make sure it still works. sometimes it won't stay closed on its own(mine didn't). if yours doesnt stay closed, you have two options:
1 - tape (so you can replace batteries)
2 - glue (you wont be able to replace batteries, but it looks nicer.

Step 5: Some Quick Tests

its done! i did some brightness tests

IMAGE 1 - the lego LED light is on.
IMAGE 2 - this is the Lego LED light and a mini maglite shining at a wall from 1.5 feet away. the LED is the light on the left
IMAGE 3 - once again, the Lego LED light and the mini maglite, STARING DIRECTLY AT THEM from 10 feet away. the Lego LED light is on the right here.


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    95 Discussions


    3 years ago

    It's a really fun project to turn common household items into flashlights and other useful things. LED flashlights in general are very versatile, and you can afford to be creative with them. We will always be in need of flashlights, so this is one item that will never lose it's value. Thanks for the idea, it's something I'll have to look into making this weekend.


    10 years ago on Introduction

    I made one of these a little while ago out of one of those special edition gold 2X4 bricks from a long time ago, it works great and is holding up well, but I wish it was a 2X6 or 2X8 so everything would fit better like yours.

    and I have to know, where did you get that sick autodesk multi tool?

    1 reply

    4 years ago

    You should start selling it on eBay. For Rs. 100.00


    6 years ago

    I want one!


    8 years ago on Step 3

    Just a note, in order to get the most life out of the led and batteries you might want to consider the addition of a load resistor, LEDs don't "need" them like a lamp does but it helps sustain the life, i'd say 100 ohms is plenty


    8 years ago on Step 4

    For the closure on the bottom, you could try to fit a sort of hinge or hinges and an outside closure that looks nice, so you don't have to rip it off the glue or continue to re-tape it. But i realize that might be difficult, considering the fact of the thin plastic and the likely chance that it would break. Other than that, love this! i made one for my lego-loving nephew, he LOVED it!

    That is way nice, Jonna Bu me some mors Lego monday and Ty it out, got a cheap light, chop chop. And a small camera batteri. Want to remove the upper 2, and put in on/ off y/r .what a nice idea you got


    8 years ago on Step 3

    With an LED one "leg" will be larger so knowing that you know which is the positive side, long leg is positive. XD


    8 years ago on Introduction

    Its very cool, could i add a comment to something that is already good, it may make it even better?

    Instead of the toggle switch,which could accidentally be turned on in your pocket, could you not with the aid of a craft knife, carefully cut off one of the lugs or posts on the top of the brick, then with the aid of a dremel, cut a clearance hole for the post to slide through. Then on the inside of the brick, mount a miniature PCB switch with a long shaft on it (often found in consumer electronic equipment on panel buttons) glue the switch in place with a hot melt gun and then glue the log/post onto the shaft of the switch (cutting the shaft to length so the lug/post sits on the same level as the rest. So from the outside it looks like a standard brick, apart from the LED.

    What do you think?


    9 years ago on Introduction

    this is great, i made it and it works perfect tanks for posting!


    10 years ago on Introduction

    what you could do is get a rechargeable 4.5 volt battery and put a charging plug in the circuit ? it might work if somebody does it tell me i would love to see it


    Reply 10 years ago on Step 1

    of course not! your preference man, be creative and original!


    10 years ago on Introduction

    This is interesting. I would modify it though: Use a metal casing (durability) Use a top-mounted button (switch might get torn off, etc.) Red light (I would imagine using something like this when checking settings on a camera in the night, and red light is less detrimental to night vision) Protect LED (it's fragile, if it breaks that's it)