The Ice Bulb is very cheap and simple to make and the result looks amazing. This instructable will be to basic for a lot of people here, but surely someone will find it a fun project.
Parts:
Balloon
LED
Wires
Battery
Tape
View the video
About the pictures: My camera is not able to replicate all the light from the LED. Therefore you will see some large patches of solid white. This is not how it looks in real life. Trust me, it looks a lot better.
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Signing UpStep 1: Attach wires to LED with tape and stuff it inside the balloon.
Stuff the LED inside the balloon but keep the wires on the outside.
Now is a good time to test that the LED actually works. You do not want to find out that it is faulty after it is frozen inside the ice...





































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In theory, the salt water would act as a support for the balloon, preventing the flat-side that is inevitable when putting it directly on a plate.
If the salt content is high enough, the average freezer won't get cold enough to turn it to ice, but the plain water inside the balloon will.
Just don't let your hands dabble in the sub-zero salt water for too long or I would imagine it to have unhealthy consequences.
As an added bonus, in the rare case that you may want to make many of these, if the salt water is put in the freezer in advance, or just left in from the previous balloon, it would freeze the balloon *much* faster, seeing as how cold water leeches heat ~25 times faster than cold air does.