Looks like a nice modern system. Time to switch? One factor I've learned here, immature age- will have paired parallel branches or growth nodes, mature enough will have alternating growth nodes(you've probably seen this as you have torn up a nice big bud to enjoy.

Other factor will be your finishing height. The space available for finishing. Your plants will double in height(approximately) you'll need room for your light to be far enough away to avoid burning them, further at 600 than 400.use your hand to see how close you can be.

Having fun yet? You will I bet.