The plants were showing some signs of light stress - tips of leaves turning brown, and some “taco-ing”. I rewired everything this morning and put all the T5 fixtures (four fixture 4 foot on back wall, six fixture 4 foot pointing in from the front, pair of two foot 2 fixture from the sides angled in at roughly 45 degrees) on a separate timer. All the T5s are running 3000k bulbs.
the overhead LED runs from 0500 - 2300 (18/6)
the T5s run from 0600 - 2200 (16/8.)
I’ll start reducing the T5s gradually if I need to. My assumption is this will mimic natural conditions - stronger intensity in the middle of the lighting period as the sun reaches overhead.
closer to harvest (prolly in 2 weeks) I’ll rewire everything again, and put the pair of two foot T5 fixtures on a separate timer and switch out the four 3000k bulbs for 10,000k ones:
Overhead LED 0500 - 2300 (18/6)
Four and six fixture T5s (3500k) 0600 - 2200 (16/8.). This might get adjusted downward over time.
Pair of two fixture T5s (10,000k) 15 min/hr between 1200 - 1600.
I ran the 10,000k bulbs on my last indoor grow at 15 min/hr for much more time, and the plants were scorched so dialing it back this time. Four cycles at 15 minutes each in the middle of the lighting period might be the sweet spot; we’ll see...
I also have a collection of HID lights collecting dust now that were used previously I could swap in:
600 watt CMH/HPS
250 watt CMH/HPS (I have a pair of these)
150 watt CMH/HPS (I have a pair of these)
Never give a retired engineer too much time to think about something - the solution might be needlessly complicated.