NB

2 weeks?

usually if your light is about 10 inches above the tops of the plants - you are OK. After your lights were in use more than 6 months - their efficiency decreases. You can either change the tubes - or increase the time. Or as you suggested move the lights down. I would say that you will see some results in a couple of weeks - because you want to fine tune the light - not ti hit them hard so poor babies will wrap their leaves around the pot.

Good luck

irina

Or you can have AVs like mine. They're the same exact plant, same distance from the light right next to each other, yet one will reach way up and one will lay perfectly flat. Annoying, isn't it...