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The GrowLite Real Red 1000W Double Arc High Pressure Sodium Lamp optimizes the red end of the light spectrum. The red light put out by the GrowLite Real Red 1000W Double Arc High Pressure Sodium Lamp encourages plants to grow taller and flower as harvest approaches. The GrowLite Real Red 1000W Double Arc High Pressure Sodium Lamp putsd out 127,000 initial Lumens and is rated to last 20,000 hours. Warning: This lamp can cause skin burn and eye inflammation from short wave ultraviolet radiation if outer envelope of the lamp is broken or punctured. Do not use where people will remain for more than a few minutes unless adequate shielding or other safety precautions.