If I may offer a suggestion here, having worked in the movie industry for a number of years now, I have a slightly different approach you might take. Speaking of changing the color of the light, instead of getting a new booklight, have you thought about trying a light gel? Which is to say, the transparent colored pieces of plastic that movie people use to put in front of lights to make different colors? I am sure you could get them at a hobby store, or even perhaps an office supply store. You could try to find mostly transparent ones with just a little bit of color, cut a small square and tape over the light source. That way, you spend next to nothing and you can absolutely control the color of the light to your liking......
Just a thought.