Extra light suggestions? (LED grow)

Currently running a Mars Hydro 300, which is working pretty well in veggie but I can already tell it wont be nearly enough for how much room/how many plants I can run. I was thinking about adding an Apollo 400 or maybe another Mars panel. Any thoughts? I heard mixing HPS with LED gives some pretty sweet results so that's what I'm leaning towards. Still wish we had prices in canada like you do in the us I've only been using amazon as it's the cheapest and most reliable I can find, but has a pretty bare selection

Grow space is 2.5'x3'x about 5', with 5 plants one a few weeks older than the rest with more training, she's getting a little harder to handle LST wise