I am looking to set up a 400-400-400 MH for a 180 gal tank. Can anyone refer me to a really cheap place where to get the ballast and sockets? If I get these as the only light sources and use 10K bulbs, how can I turn on and off the lights so they have a certain sunrise/sunset effect? I think turning them on all at once would produce photo shock? I thought about putting a pair of actinics 48" (one in front and one in back), but with this much lighting I think I could do without. I have heard that you should place MH with the bulbs parallel to the water surface and perpendicular to the front and back glass. Is this true? What way should the socket face (back or front)? If this is true, why is it that all the pre-made hoods for sale in all the NO places have the bulbs parallel to the water and the front glass?? Any suggestions?