T5 fluorescents are great, in the right situation. Don't expect long life out of the lamps and ballasts if the temperature of the area they are in isn't well controlled. They simply will not last in high temp applications where it reaches 85ºF+. I have hundreds of them in a distribution warehouse and they were great at replacing MH fixtures but it is climate controlled @ 75ºF year-round. The rep told me up front about the operating temp limits of the T5 fixtures.
