Yeah, you pretty much nailed the problem in your initial post. Different light sources have different amounts of different colours which distorts anything you view in that light, obviously. Everything will be distorted to some extent, even if we can\'t notice it.
You can get most types of various coloured light bulbs and tubes from a home improvement, do it yourself, type store. Even a Walmart, Sears etc will have a fairly good selection, if you\'re in North America. Many better bulbs and flourescent tubes even show you what colours of the spectrum they emit on the side of the box. If they don\'t or if you\'re unfamiliar, the staff should have a decent idea of the colours emitted by most lights they sell.