Try starting with a lower kelvin lamp like maybe a 14K to increase your light levels. If you want to change to 250w you are going to have to find a way to get rid of the increased heat that the new 250w lamps are going to add. On your PC's I would go with an actinic and a 10K. And remember PC's work but lose lighting levels every 8 to 10 months. MH does the same. Buy a cheap light meter and check it every three months. If you like the blue look, try 150w DE 12k Reefflux lamps. I am sure you will get plenty of ideas today as people chime in.