Adding another 1000w 2 weeks into flower?

I have probally way to many plants in my current grow. They are all thriving and healthy and starting to bud. They however are under a 1000w mh. I just repaired an old hps. I put a new ignitor in it. Are there any concerns adding 1000w hps around 3+ weeks into flower? I think there would only be benifits but just though about checking in. Heat will be no problem. Pleanty of fresh vented Alaskan cold air.

Sorry bad post title. 3+weeks into flower.

i think your plants would love it since the mh bulb is the wrong spectrum