scope:

Introduction

Reduction of lighting energy use in buildings through controllable lighting systems to eliminate energy waste is in the national and global interest. Fluorescent lighting systems are typically controlled by means of dimmers and sensor switches to set light levels according to the occupant needs. In addition, national governments concerned with the environmental impact of mercury-containing products are proposing and setting upper limits on mercury dosing levels in fluorescent lamps, often without full consideration for the overall impact on the environment. Mercury depletion mechanisms may increase in controllable fluorescent lamp systems leading to necessary minimum mercury limits for proper function throughout the expected usage life. This paper discusses technical tradeoffs associated with reduced mercury dosing in fluorescent lighting systems and their environmental impacts. NEMA members are committed to providing fluorescent lighting systems that allow lamps to be controlled to save energy while reducing the mercury content in the lamps to the extent that it is technically possible without sacrificing functionality.