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The METALARC PRO-TECH metal halide lamps were created to fill the need for a safe light source for applications where a protective lens on the metal halide fixture was either impractical or detrimental to fixture design. Please note that metal halide lamps cannot be operated without a ballast. -METALARC PRO-TECH design – glass shroud for containment and UV-reduction -Open or enclosed fixture operation -Universal operating position on low-wattage lamps -Up to 20,000 hours average rated life -Lower maintenance costs -Lower initial luminaire cost -Reduced luminaire dirt depreciation