Might need a few more. With these strips, one benefit of adding more strips, is you can run them at lower power per strip — lower heat emission — closer to canopy. And at $10/strip...the decision is pretty easy. Remember, lights are food 👠and dealing with excess heat from other high temp lights is costly.
Have a look at my build journal. Start reading over on LEDgardener some of the info on led lights. There are a multitude of build guides for different size of spaces. Lots of very smart people in there too.