XM Lighting Frequently Ask Questions


What is XM Lamp Life?

Lamp life varies depending on various operating conditions. Some key variables are lamp operating positions, duty cycle, line voltage regulation and ballasts operating characteristics.
Rated life is a statistical mean life.
XM400W is rated 6,000 hours based on 10 hours on 1 hour off duty cycle.
Shorter duty cycle will affect lamp life and performance.

Economic Life:

Economic life refers to the hours of operation during which a lamp is designed to provide optimum light output and color quality as well as lowest replacement cost. Economic life describes actual lamp life better than rated life because rated life does not account for the lumen depreciation and color shift that occur as lamps age. The economic life of lamps is generally 60% to 70% of the lamp rated life.

Rated Life:

Rated, or average (median), life for metal halide lamps is a value of lamp life expectancy based on laboratory and field tests of representative lamps, operating on approved ballasts, with a burn cycle of at least 10 hours per start. The average life is determined when 50% of traditional metal halide lamps initially installed are still operating.