Is there anyone using a orbit lighting unit 2x150mh plus 2x130pc and could tell me what ou think about it. I ordered one for my 110 gal. tank which i have 270 watts. My tank size is 48x30x18. I hoping the tank will be bright enough.
If you tank is 18" high yes it will be bright enough for sps. If your tank is 30" high then you need to go with 250w or place the light loving species at the top of your tank.
Same ballast, just in a different place. Don't think a ballast mounted inside a fixture or outside a fixture has a great impact on the strength of the bulb.