[klaus777]

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.

 

[klaus777]

I have also read that after 2 years the output is reduced by 20% so I guess if the system can be sustained at 80% output there should be no problem. Given that information I will be replacing mine. My system is already lower light than I would like to have.

 

[klaus777]

I don't suppose anyone has seen an intensity vs. time chart anywhere?

 

[klaus777]

Jeff, let me know how the giesemann bulbs works for you. Those are what I was looking at for replacements myself.