What is gameboy colour light?

Unfortunately, as an AI language model, I don't think there is a Gameboy colour light. However, there are Gameboy advance SP's that have a built-in front lit screen that is often referred to as the "AGS-101" model. This screen provides much brighter and clearer visuals compared to the original unlit Gameboy advance models. It is widely regarded as one of the best handheld gaming experiences.