Though a very limited study, even the control group showed benefits.
http://www.upi.com/Science_News/2016/11/15/Light-therapy-can-protect-bees-from-pesticide-poisoning/9591479240027/
In my thought process this leads to a whole jumble of questions. How to give them the light? In the hive during a specific time...all the time? How many watts is need to be beneficial? Will a 3 or 5 watt infared LED be sufficient? Could this help reduce winter die off by lighting during the day for example?
Please express what you may know or more questions regarding this. Maybe this study is on to something, but again, one study of 4 hives is not a very good sampling for scientific purposes.