howdy.
neem oil or any other oil or chemical spray will burn leaves if light gets on them. always let yr plants dry before the lights come on.

neem is a slower acting pesticide. stops em feeding, brreding but doesnt knock em down.
try 1 cup a hot chillis diced, topped with boiling water and left to steep overnite. strain concentrate and add to a 500ml sprayer. top up with water.
dont breathe it or get it in yr eyes.
repeat daily for 3ish days.
goes good.