5 hrs before 24 hrs of darkness need help!

About to throw my 3 Trainwreck plants into flower at 6pm the lights will go out for 24hrs, however I want to spray my plants with organocide prior to lights out. Is it ok to do that going into the 24 hr period? Also I would like to add a dehumidifier due to my tent staying around 65 (sometimes higher) to get it down to around 50-55 for flower don’t add it now of after lights come back on?

Camera sucks but here are some pics 3 plants in a 4x4 the pic with no light was from the 20th of Feb. All others today

@Lucc89 if you ever need to spray anything on the leaves do it always at lights out.
You won’t burn the leaves that way.