I want to create an RGB LED setup that can light up a large (6feet by 4feet) canvas somewhat evenly.
I'm thinking a strip of LEDs along the top of the canvas with some diffusion would do most of the work with maybe some more underneath (along the bottom) so shadows wouldn't be so heavy.
I'm not really looking for perfectly even lighting, just enough so that a white canvas, in a normally lit room, would appear to be different colors (red, blue, purple etc..).
All of the LEDs would be the same color, so I wouldn't need to address each one differently. Just one master color control to rule them all.
Is this controllable from a single Arduino + a power supply? Or would I need as many outputs as I have LEDs? How many LEDs would it take to color an area of wall in a lit room? Is going one main strip above and a secondary (less LEDs) strip below a reasonable way to go?
It would basically be lighting a canvas that will be painted on in a performance situation, so the painters hands would be on the canvas. So a single source would cast big shadows underneath them (which could be nice some of the time, but not all).