Since HID lamps "season" and suffer from LLD (Lamp Lumen Depreciation) the lighting scheme usually has to account for the lower end performance of the lamps. See Lamp lumen chart. This means that when new lamps are installed they over-light the area for the first few thousand hours of operation, and then provide the proper amount of light for a few thousand hours. After that, for more than half their rated life, they provide inadequate light. The E-Series stabilizes the light output of the lamps, reducing the luminosity of a new lamp to minimize over-lighting, and improving the luminosity of the lamps for the majority of the lamp's life. In addition, the life of these lamps exceeds the rated life by up to 40%! The E-Series compliments existing EMS systems. Where EMS systems save money by turning your lights off whenever practical, the E-Series saves you money when the lights are ON!

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