Old T5HO Bulbs

[jcali10]

Do old bulbs contribute to BBA? Mine are one year old, and I've been having issues with BBA in my 50 for months now. I've also altered my fert dosing regime at the start of the problem. I went from PPS Pro to EI, and I was also testing my NO3 and PO4 regularly and if those parameters were in the target range, I would only dose Potassium (K2SO4) and CSM+B.

I guess this is where LEDs have a major advantage. Longevity without diminished PAR output.

[Aaron]

Why not switch back to PPS if that was working for you?

[jcali10]

I may do that. I've always found PPS Pro pretty easy to do. I prefer a regime that requires daily dosing.