Is this just for appearance in FW, plants, FO saltwater or reef? I am also going to assume you mean 250-300 watts, not wpg. If you build a canopy, and wire together however many weather proof type A sockets, a couple computer fans, this will be the cheapest I have found. There are some twist fluorescent bulbs that are 6500K being sold at walmart now, that also are 42W each.