Hello fellow LED'er.
I checked out the sanlight Q6W specs and it looks like it's perfect for what you're doing and has the adequate footprint for up to a 3x3 scrog. So, you're good there.
If you'd like some height on the girls, simply raise the light upwards and allow them to purposefully stretch a bit. When you're happy with their height, lower the light back to normal to start forming your tight internode spacing. I do about the same thing so I have something to train and can open them up way better. I'm presuming that's what you're looking for too?
Anywho, hope this helps and good luck getting that height๐. Cheers. Throw me a PM if you'd like to talk supplements to help rapid growth, if you're not already using them.