Newbie grower looking for some advice

Greetings!

I currently just set up my grow room and am stoked!!!

I do have a question to the experienced growers out there....

I have a 600w light on a 6 foot light mover floating my light back and fourth on a track over my green babies.

How many plants can I have under this light with it moving?
Currently I have 22 (2 rows of 11) and they are looking beautiful! I was wondering if I should just keep the 600w light going all the way through flowering or if I should switch to a 1000w.

Can I even fit that many plants under one light on a light track mover? Not really sure what to expect and would love the advice from anyone that would know.

I do have plenty of room and pretty sure I won't out grow my space.

Thanks in advance