Two lamps different watts...same height????

Hey all, I have a Q? I have a 400 watt HPS w/hood and a smaller 150 watt HPS w/hood and my question is, Can I place them at the same level or should the 150watt be a little closer to the canopy?

In the pic Im vegging out with a MH and haven't ran the 150wHPS due to heat issues but Im soon to start flowering.