Well like the title suggests I have a Viper 150W HQI clip-on, less than 3 months use on it, I love it I'm just upgrading to a larger tank and want to move up to a 250W Pendant. Well sell the clip on for 150obo, or trade for the 250W Pendant depending on the age of the unit, age of bulb, type of ballast/reflector I may be willing to throw in some cash or frags or something to make up any difference.