MH and HPS during flower????????//

Currently I am 3 weeks into flowering with 400 Watt MH. I just added in 2 100 watt HPS into the flowering room.
Is this good or bad?
Should I go with one or other?
I also put these hps lights to the sides so it gives the undercanopy buds more light. Is this the right thing to do?

yes both lights together are best scenario.