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Outdoor Lighting: Safety & Savings
Light Up the Night
Outdoor lighting presents a unique problem: there are few walls and no ceilings to reflect light back to your eyes. However, there are outdoor lighting solutions that can get the brightness you want while saving you money. One way to improve your outdoor lighting is to aim and position your lighting fixtures on buildings or other exterior surfaces (low gloss or rough surfaces minimize glare).
Bulb Basics: About Efficiency
HID: Light With Might
|Efficacy (lumens per watt)||Lifetime (hours)||Color Rendering Index||Color Temperature (K)|
|Mercury Vapor||25-60||16,000-24,000||50 (poor to fair)||3200-7000 (warm to cold)|
|Metal Halide||70-115||5,000-20,000||70 (fair)||3700 (cold)|
|High-Pressure Sodium||50-140||16,000-24,000||25 (poor)||2100 (warm)|
*Source: Department of Energy, Energy Efficiency and Renewable Energy, “Energy Savers: High-Intensity Discharge Lighting.” (July 19, 2011)