I have the same t12 high output light fixtures in my shop and barn that were installed 12 years ago. I have never had a single burnt out lamp. Some have darker ends, but all still work.
I think the newer T-8 tandem light fixtures (have 4 - 4' lamps set as 2 x 2 configuration) are far better fixtures, but i cant seem to replace perfectly good light fixtures just for something new. I have a large supply of extra T12 HO lamps in the shop. The manufacturers gave stopped all production of T12 lamps last year, so when the stocks are gone...there gone forever.
The T-5's burn way quieter than the old high output fixtures (which hum pretty loud).
Im an electrician and install lots of different fixtures. usually i install the tandem T5's and clients are very happy. Very good light output for the $$. If you use 5,000 K or 6,500K lamps, youll get even whiter, brighter light output.
I'm really not impressed with LED lighting options as they stand right now...maybe in a few years.
I have also installed keyless fixtures with 65 watt compact florescent lamps. these have an equivalent 300 watt output. Pros are that its cheap to install and give ok lighting. the cons are they take a few minutes to come fully bright.
hope this helps