I'm happy Bruce had success with his lights. IME, I've never replaced a light before it failed (blew), usually in the 1.5 year to 2.5 year range. No BBA problems, no algae problems at all. This experience is consistent with a 20 gallon High (55 watt pc, ahsupply), 50 gallon (72 watt pc, ahsupply) and (10 gallon 26 watt, 2 13 cfls). I haven't used linear t5HO but pc lights are really nothing but linears folded in half.
Wishing I had a pithy quote