Where can I find a rainbow lamp/projector?

Question

Where can I find a lamp/projector that will display a genuine rainbow on a wall? I've only found the ones with the LED lights and I know I've seen the ones that just use white light with angle and reflection...

I'm having a hard time finding one, can you help? Thanks!

Answer 1

Here is one that would use an external light or even sunlight:

http://www.physlink.com/estore/cart/Rain...