Rob got it right.
Although a near transparent planer, as an emissive source WILL illuminate the environment, it will be a... best description I can give is "flat" light. It will light up the area of effect, but it will be almost as good as rendering in 3delight with no lights or cameras... a flat, barely shadow casting result. Best concept is to just arrange them in a manner that they will not cast all sorts of funky reflections... however, if you want to go with a pretty psychedewlic result, you can use different color palettes per plane, and let them irridize all over reflective/metallic surfaces