In reading posts I see some that mention switching the ballast from HPS to MH to match the bulb. I have an ipower dimmable 1,000w HPS MH but I don't see any knobs or switches except for the dimmable option. So I'm hoping I have one that doesn't need switched when I change the bulbs, but would sure like someone to tell me that's correct. Or tell me where the switch is, lol.