300 watt and a reflector 48. Thinking about adding a mars sp150. In veg I keep the lights pretty close. At 12 in the 48 looks almost like its bleaching the leaves directly below but the 300 isn't. The 48 pulls about 100watts and the 300 pulls 130. Unless it's not light bleaching. This is my first grow with the 48. Last grow only used the 300 and went as low as 9 in with no problems. So now I'm not sure.
You should be fine with what you already have in there.
The leaves look light green instead of dark green under the middle of the 48. Could that be some light bleaching? At 12 in? Or something else.
It could be yes. Slow light burn or light stress causing nutrient issues.
I think you nailed it with the nutes taking time to get there becuase the longer the leaves stay there they start to green up.
This is the video I watched. This guy has some great tips. He made it super easy for me. I love the tip about shortening the power cord for a nice tight fit too.