steamroller
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I am running the TSL 2000. They are 6 months old aprox .How old are your LED lights? I have four Mars SP-3000 LEDs and keep it at 14 inches too :-). My PAR is about 1200 on top. LED lights are suppose to weaken over time. I only had mine for 6 months now and the SP-3000s are operating very well.
Right now they are 16" from highest bud .
With warmer weather my room may get up to 86 so I keep the light safely away .
May turn on AC for daylight and get closer for last couple weeks [week 4 1/2 flower now ].
Many say over 800 is not doing much without co2 ?