This was exactly my train of thought when swapping from LED to T5, in the grand scheme of running a reef tank it's not that much more money to swap bulbs once a year and it's a small price to pay for having a tank which still wow's you every time you walk in the room.It does cost to change bulbs every 12 months which is a pain but its an expense of our hobby if you want healthy corals. Fwiw my bulbs are nearly 14 months old and still kicking ass :D. I will be changing them very soon though.
I'm loving that I made the swap :) and I only went with a 6x54w sun power