The CBC science show had an interesting segment on the health impact of LED lighting and the importance of red light from visible to IR. You can listen to it at this link.
Scroll down to the segment titled
LED lighting is bright, efficient, and perhaps a problem
This part of the segment is the first 10:30 of the 18 minute audio clip. Since we are probably not going back to incandescent lighting, the scientist does offer an alternative that many of us already enjoy.