I am curious to see who uses T5 lighting. I have read that they don't need to be replaced until after a couple of years. I been using T5 for 6 months now and would like to know when I should think about replacing. My VHO's were every 6 months.
My guess would be that's to sell more bulbs, or their bulbs aren't up to par.Hagens website recommended replacement after 6-8 months. Of course that might have been to encourage the sale of more bulbs, who knows.