I have switched over to Timber COB leds but I used to run a thunder 600w HPS for many years. The ballast had a setting beyond 100% called “super lumen” which was supposed to be 115% power. It is sort of like having an amp that goes to 11...very “spinal tap” but to some it might be overkill. You will not notice much of a visual difference between 100% and super setting but there are bulbs made to run at this slightly higher wattage, namely the Eye Hortiluxe Super HPS.
I’ve tried several brands of HPS and MH bulbs but the eye hortiluxe super HPS was the only one that would last on “super“ setting without burning out. The extra wattage does help push slightly larger flowers but it is at the expense of the bulb working harder and fading faster. I went through three lumatek 600w HPS in one year even after dropping the setting back to 100%. Tried using metal halide bulbs too which fared even worse; had one burn out in a month. So if you use the right kind of bulbs the super setting is pretty good but it will burn out bulbs faster and throw slightly more heat.