The Nanolux MaxPar DE HPS 1000W Lamp is one of the most popular lamps of its type to deliver high-intensity 2100 umols, supplemental lighting in greenhouse crop production. 25-30% MORE EFFICIENT THAN SINGLE-ENDED HPS LAMPS Nanolux MaxPar HPS lamps deliver greater energy savings AND a greater return on equipment investment within the first months of operation in varied garden applications. Replace the DE lamp in your Nanolux complete fixture approximately every 9-12 months of use.