This new lamp cord extension allows you to mount your Hydrofarm remote ballasts as far as 30 feet away from the lamp reflector, especially useful for greenhouse applications or when lamps are mounted on light movers. 15 foot length, attaches to 15 foot lamp cord included with Hydrofarm remote ballasts. Heavy 16/3 guage 600V construction, patented Lock & Seal for water tight connections. UL Listed.