Hi buzzed and welcome to the city ........let your plants go dry then pick the pot up make a mental note of the weight....thats dry.....water your plants when they feal they are at the light stage again.....water....that is the easiest way or get a water meter.......laters jay edit if that doesnt make sence sorry im stoned lol.
Another option is to purchase a moisture probe at your local garden shop. They are pretty cheap and rather accurate. Leaving the guess work out of it. Good luck man. gm714
do you wait till all the white hairs turn brown before you harvest or doesnt it matter? notsure when its ready dont want to do it to early or late thanks