I have tried the UVL (formerly URI) Super Actinic R bulbs in both the 39W T5HO and 54W T5HO configurations.

Not having the best of luck with the 39W version. They start out well, but after a few months, they dim considerably and lose a great deal of intensity. T5HOs are theoretically supposed to last 2 yrs - I usually retire mine after a year -

I am overdriving them with 54W Advance ballasts - but I have used this same type of ballast with Aqua Medic Ocean Blues and TRU Actinic 03s w/o incident.

I have read that others overdrive these same bulbs with (60W) Icecap ballasts.

Overdriving undoubtedly cuts their usable lifespan, but from ~24 months to <6?

Anyone else have any issues with these bulbs or am I just 'lucky'?