So I'm looking at upgrading my 150w Coralife DE fixture to a 250w of any kind and I want to understand all of my options. What are the advantages to running a Single End bulb versus a Double End bulb? Most of you you guys, you know who you are 8) , who have pro tanks all run SE as far as i can tell. My best guess is that SE offers more options as far as fixture. Seems like large, horticulture style fixtures are popular. Please let me know why you choose SE over DE or vice versa.