I run 5 3590 cree at 50% they kick ***.. I had 8 t5's the cobs blow them out of the water. at half the watts at the wall. Not cheap it's a $500 light. But will pay for it's self in time.
Don't use 1 15 gal pot for 1 plant . 2x2screen is just big enough for 1 plant in a 5 to 7 gal pot.Just veg it longer to fill the screen. I scrog 4 plant in a 5x5 area.in 7 gal pots. I can average 4 to 5 Pounds every run with 4 plants. I use 1 screen
To early to transplant you risk root damage when removing from cup if you do it to soon. These plants can spend another two weeks in these cups. Explosive growth will happen if you let them root bound a little before you transplant. They need to harden over before transplanting.