There Lumatek MH 400W 240V is a pulse start lamp designed to be used with the electronic ballast Lumatek 400W 240V and is produced using quartz arc tube technology and a specific blend of horticultural gases that creates an optimal spectral output for healthy plant growth. The quartz arc tube allows the lamp to operate at higher internal temperatures increasing color rendering and efficiency. Pulse start technology allows for faster start up and restart times, longer lamp life and increases level upkeep PAR/PPF.