Lighting help?! Anyone?

Alright guys, I am lost here. I'm planning my room now and I'm looking at a 1k watt. But I've read some folks use HPS for vegging and then MH for flowering. Is that better than just running HPS all the way through? And if so, would it be alright to just the swap bulbs? Maybe 2 plants max at the same time, so it wouldn't hurt me to swap bulbs. Just need some insight on the topic. Thanks in advance.

Go HPS for flower and MH for veg...If you are going to swap bulbs then get a digital ballast. As for the amount of plants, just make sure they fit under the light, but if you are going to use that much electricity you better make it worth it and grow more than two at a time!