LEDwholesalers GYO2009 3-Piece 400 Watt Hydroponic 6-Inch Cool Tube Grow Light Set Ballast Works with both High Pressure Sodium (HPS) and Metal Halide (MH) bulbs (MH bulb NOT included) Automatically detects type of bulb installed and adjusts itself accordingly 6-inch Air Cool Tube with removable extended reflector Fits all standard 6 air vent and exhaust fan system (NOT included) to any grow tents UL-listed, CE certified