The Philips goLITE BLU is a compact and portable energy light which produces blue light like a clear summer sky. This particular light therapy is known to naturally help increase your energy level whenever you need it and help fight winterblues.
I bought the Philips goLITE a few years ago and have only ever used it sporadically, thus not a reliable experiment. I’ll find a way soon to conduct a measurable experiment with it.
Here’s a review by ERB Reviews.