600 is a lot of W's!
My first LED was a 300w reflector LED (the ebay ones with the green case) but I noticed, in hindsight, that it wasn't ideal for flowering, like the floodlight great till about this stage then just took an age to heavy up. Maybe you need more deeeep red? Be interesting to see what the next few weeks bring eh.
After a few years trying to water soil with hydro nutes, the only (studied) hydro runs I did were with Canna products and I decided, once learning what was actually needed, that i'd rather be a dirty gardener, gardening.. than a chemist in a lab