alberto - if you have me build the canopy for you (we have already talked about this a little), ill install the lights into the canopy for you if you bring them with you when you come to pick it up. i would go with 250 watt lights if i were you - assuming you are planning SPS. the 150 watters may not be bright enough at the bottom 2/3 of the tank for stoneys. 400 watters will give you more of a heat issue than you want - unless you plan on running a chiller. talk to frederick at coralreefbazaar.com, he will give you a great deal on retrofit kits that will fasten directly to the inside of the canopy.