I'm looking for a source for one of those "holographic" (as they call them sometimes in ads) image projectors, like were popular back in the 90s with small key-chain laser pointers that had filters to project hearts, smiley-faces, etc... but I'm looking for one that will project a square grid pattern and can accept a beam power of up to 8 Watts at 445nm without cooking the poor pattern filter Would like to know a) what those pattern filters are properly called, and b) where they can be purchased inexpensively. Thanks!