when to switch from MH to HPS with autos

Was wondering what day I should switch to the 400 watt HPS for my autos. They still have a bit but was wondering if I could get a timeframe to do so that would be optimal.

No need - autos will work well with either light. I use LED's and get awesome dank.

The HPS has more lumens tho. Wouldn't that make it more beneficial during the flowering?

Yeah - more light is better. But you could have run them from day one with autos.

Got it, so basically it comes down to when I want to switch them over. I'll do it when flowering hits then