Former Guest
Active member
i have looked for an answer and all i can find is that you can run the MH on HPS setting obviously and it explains how the bulbs operate but nothing about if the metal halide bulb would produce less lumens because of it. I'm asking because the hydro store employees told me that i shouldn't do that because of that reason and i need to buy a whole new ballast because they can't get the part to fix it. i can buy the part to fix it eventually but in the mean time, is there really a loss of lumens??