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The lumens for a NEW 400W
Metal Halide would be around 36,000 Lumens… although
the initial lumen output of a Metal Halide fixture may be quite high, metal
halide fixtures are known for their poor lumen maintenance. The average 400w
Metal Halide fixture emits only 65% of its initial lumens by the time it hits
Mean lamp life (40% of total lamp life or 8000 hours) and as low as 40% of its
initial lumens by the end of lamp life.
1000 Watt Metal Halide Lose
50% Even Faster…1000WMH lamps are rated for a life of around 11,000 hours. So
in keeping in the characteristics of metal halide they would
produce the light output of a 400 WMH lamp in roughly 5,000 to 6,000 hours of
use. This means that you are only getting 50% of the output from your
1000WMH, but you are still burning 1058 watts. You are getting 1/2 the
light for 100% of the cost of operating the fixture.