Looks to me like they have reached their DLI limit or circadian rhythm. Those two light fixtures are a lot for a 4x2. I run a 550 rspec in a 3x3 And I have it turned down to 75%. The red bulb is not the issue, when the DLI is reached they are exhausted.
Look at it like this, you’ve stayed awake for 18 hours, your drinking coffee but it isn’t keeping you awake. You are going to show signs of fatigue right? Your plant is telling you the same thing.
My advice: Use the king led only, raise the light up so it is 24” above the canopy (use their recommendation for distance) and use a 18/6 light schedule. Drink a beer and relax, plants tell you everything you need to know by showing you.
Look at it like this, you’ve stayed awake for 18 hours, your drinking coffee but it isn’t keeping you awake. You are going to show signs of fatigue right? Your plant is telling you the same thing.
My advice: Use the king led only, raise the light up so it is 24” above the canopy (use their recommendation for distance) and use a 18/6 light schedule. Drink a beer and relax, plants tell you everything you need to know by showing you.