Those white hairs are pistils and you will want to harvest when most of them are orange to brown.
Every time you move the lights the plants will try to follow. The plant will swivel in orientation to face the light source. People write in asking why their mid-leaves are getting a swirly look. Reason is that they have recently moved the plant or light and the plant is trying to swivel to get as much light as possible. Try not to move them, eh?
Good luck, BigSteve.