Better to spend a few dollars instead of hundreds if you're looking to build your own lightsaber. This dad shows us all the materials you'll need to do it on your own. All he did was go into a 100 yen shop and bought a couple of items.

He got a transparent manual siphon pump and a mini LED flashlight. Color film and batteries too.

light2.jpg

Disassemble the siphon pump because all you need is the suction tube and the cap.

light3.jpg

Use wire cutters to remove the bits of the suction tube that you don't need.

light4.jpg

Use a box cutter to cut the tapered end of the suction tube. Then close it with the cap.

light5.jpg

Once you're done, take colored film and secure it to the flashlight.

light6.jpg

And then, secure the flashlight into the handle end of the suction tube.

light1.jpg

Done!