Are light movers worth the money? and if so why?
LIGHT MOVER, (Noun) a motor system to keep your lights moving in order to provide better light coverage and distribution to your plants.
I need more data on what data you need? 9 x 4 room
They use more power.... I don't see a need for them, just another way to waist $$$
The data needed from you (for example):
Size of a grow room. Answered.
Other data that would be useful would be information on your light set up.
If you have 2 400/600w HPS lights, then no, you would not need a light mover.
If you have one 1000w HPS in a room that size, then no, you would not need a light mover.
If you have one 250/400/600w HPS, then yes, a light mover would be ideal in that grow space.
I speak from experience or I don't speak at all.
instead of a light mover how about buying another light