Commercial growers using HPS 1000W fixtures as their light source will typically need to 're-lamp' every 16 months or so.  HPS lamps lose their intensity and die over time and should be changed after 10,000 hours of use.  The Philips Master GreenPower HPS 1000W DE lamp is the referenced leader in the industry for high quality and life longevity which makes it superior to other brands of HPS lamps.

The double-ended Philips Master GreenPower HPS 1000W DE lamp is specifically designed for high-frequency electronic ballasts that require a connection at each end of the lamp, thus removing the need for a frame wire inside the lamp.