Which bulb colour is good for studies?

iam doing edexcel examination. i always had used white colour for my studies. would it be a good idea to use some other coulor for a change. if you have any suggestions. please post to me.Which bulb colour is good for studies?The white is the best of all, it will keep you at the best study mood.
Which bulb colour is good for studies?
blue
Which bulb colour is good for studies?
If you do your work under pink light, you will feel extra peaceful!
I've read from an article that says that for an optimum studying environment, light from your table lamp should be orange, and your background light(room light) should be white. No harm trying it out =)