So I want to build a rainbow projector. I've decided this

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>>1145549
I have a few things around the house already. A few different lights, a prism, the lens from an old rear projection tv, and a concave mirror. I don't think any of my light sources will work.

>>1145549
I really don't think you can do it on a DIY budget. Possibly at night, but not during the day.

>>1145552
It will be a halloween display so it will only be up at night. It would be fine to just project on my house. I do own a home theater projector but I'd rather not use that and I'm not sure it would be very bright.

>>1145553
I'm thinking fog machine, and hope the night isn't windy. Maybe dry ice with a fan as an alternative - you're going to need something for the rainbow to show up on.

I have no idea if this will work, but perhaps some sort of large semi-transparent projection screen could work as well. Set that up and project the rainbow onto it, and you could build it as large as your budge affords.

>>1145555
I figured it would just show up on the front of my house.

>>1145556
oh, well that's pretty small scale compared to what I thought you were going for.

Honestly, I'd just look for high-power LEDs of the appropriate colors, arrange all of that into a rainbow lamp, and shine that up the side of your house. It'd be easier than trying to position a prism properly with a bright enough light source to show up how you want it to.

A fine water mist with light shining at the correct angle?

>>1145549
You mean your asshole doesn't already project rainbows?