I want to know the cost of a kit to build an 8 foot by 8 foot LED cube.
If you look you can find kits, e.g http://picprojects.org.uk/projects/lc/index.htm Modify to suit your needs. L
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The cost is dependent on the number of LEDs in the cube and hence the complexity of the hardware to control them. If you had one per 6" then that would be 16 x 16 x 16 LEDs which comes out at 4096 LEDs. Controlling that many, especially if they're RGB LEDs would not be easy (to say the least). The cost - LOTS, plus many, many, many hours wiring the thing up.