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Comparison    Metal Halide  High Pressure Sodium
Warranty 5 Years – No ?’s Lamp – Ballast - Fixture   Lamp – 0-1 Years Ballast – 3-5 Years  Lamp – 0-1 Years Ballast – 3-5 Years
Lamp Hours Replacement  100,000 1 every 15 Years  12,000 1 every Year   24,000 1 every Year
Lumen Failure Rate  10% @ 70,000 Hours  >30% @ 6,000 Hours   >30% @ 6,000 Hours
Lamp Operating Temperature  140 - 200 Degrees F  600 - 800 Degrees F   600 - 800 Degrees F
Amperage Draw  110v 220v 3.5 1.6  110v 220v 9.5 4.6 110v 220v 9.5 4.6 
Watts Used  400w  600w - 1000w 600w - 1000w 
Re-Strike  Yes – Instant  No No 
Flicker / Glare  Low  High High 
Environmental Impact  <10 mg of mercury Over 15 Years  >200 mg of mercury Over 15 Years >200 mg of mercury Over 15 Years