Just noticed these replacement LED bulbs for T8 fixture but not all that much cheaper than the whole light. And only 30 watts total.
http://www.samsclub.com/sams/t8-15w-5000k-2-pk-2-pack-t8-led-lamps/prod18920266.ip?navAction=push
http://www.samsclub.com/sams/t8-15w-5000k-2-pk-2-pack-t8-led-lamps/prod18920266.ip?navAction=push