When to change ATI T5 Bulbs

[Jyetman]

Can't find any information on this topic when to change them out. I have a ATI Blue Plus T5 any advice would be nice thanks.

[powderhound]

I usually replace t5 every 12 months. But it does depend on the fixture you are running them in. They can go longer if actively cooled, or replaced sooner if not

[Mark426]

9-10 months is the average for most. Short photo period then obviously longer. A dimming fixture then 9 months is pushing it. And as said above, the hotter they get the sooner replacement is needed.
I have a dimmable fixture so I replace mine every 8 months or so.