Need help with differences in lighting

Hi i have a 4x4 tent with 2 2000 watt leds and a 400watt metal halide on a 18/6 schedule
When i switch to 12/12 for flowering, should i switch the metal halide with the high pressure sodium, or should i just leave the metal halide bulb in??


Switch to HPS for flowering, better spectrum for flowering, more light per watt. I grew with MH and HPS for over 20 years.