For those who don't want to commit to installing an LED ring on their printer, I have found this lamp to work really well for illuminating the print bed:
http://www.amazon.com/gp/product/B00EUSPBK2
And it serves double-duty as an emergency/power outage light source.
LED Lamp
Re: LED Lamp
This lamp is pretty good too: http://www.ebay.com/itm/141286843933