looked at the bulb an no markings other than this:F15t8/D nothing about wattage at all. its only 16 in long not sure if that helps at all. i realize it will be a long time for anything to happen even if it does. but is ther anything i can do that might help them. im not even too concerned if they get very bog or flower etc. just using this as a chance to see what happens. they were jsut seeds i found in a 20 bag so no money lost if they dont work. thanks all