400 watts versus 360: Only about 10% stronger lighting. Not much difference. A flowering switch just turns on more red LEDs. If they were on from the start it probably would not hurt anything. I read one paper about using PAR meters with monochromatic LEDs that claimed the amount of light was more important than the spectrum. Which suggests you might want to leave the flower switch on all the time. The Higrow lamp will use 10% more electricity.
I really wish Amazon would make these folks stop fraudulently claiming 1000 watts or 2000 watts when they really are 400 watts or whatever drawn from the wall. If they want to claim their lamp is more efficient than others, they should list the PAR rating or at least lumens and color temperature.