Suggestion for solution !
Prevention : Par meter/humidity with probe and put the probe on the top of your canopy/top bud ( reset the min/max every day to see your results and I would suggest even logging Intill you got it mastered ) , thermometer ( this tool makes it so you can check temps like a master of everything for floor to your lights /reflectors and it really helps you know if your environment is off in temp in-balances )
those two simple tips/tools (10-20 bucks each ) will save/change your whole grow game! Environment is 30% or more of your end result...