However, Gilles Vandewalle at the University of Liege, Belgium, and his team have been experimenting with blue and orange lights and believe their testing shows that the orange light affects the part of the brain related to alertness and cognition more than the blue light.
We will let you read both articles and let you make up your own mind. Personally, I like blue, so that one gets my vote. Whether it actually works better than orange, I don't know. I'll let them battle it out.