Hello, I am very new to growing aquatic plants. Recently, I saw a 48" 55 watt, 4 bulb full PC hood made by Perfecto for $219 -- bulbs included (My local pet store sells them). It is not a retro-fit. What I am wondering is why this brand of PC is so cheap? I have seen PCs with the same specs for $500 or so. Has anyone had any experience with this brand of PC? Thanks, Jim