ECM: Lighting

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L5. Convert Exterior Lighting Fixtures

Description

In developments where mercury vapor, incandescent, or halogen exterior lighting fixtures illuminate exterior areas such as grounds or parking lots, substantial savings can be realized by converting these fixtures to high pressure sodium (HPS) or metal halide lighting. In addition, the color quality of both types of lighting is much better than that of mercury vapor lamps. In some cases, such as porch lights, compact fluorescent lamps may be the most appropriate replacement for incandescent lighting.

Applicability

• Developments with mercury vapor, incandescent, or halogen exterior lighting

Types

• Metal halide
• High-pressure sodium vapor (HPS)

Considerations

• An experienced lighting professional should convert the fixtures. and may be able to provide additional lighting consultation.
• While energy efficiency is lower, “white” or “indoor” types of HPS lamps have better color quality than the “outdoor” types.
• Low pressure sodium lamps are not recommended because all colors appear yellow or gray under these lamps.
• Recommended light levels should be maintained after conversion.

Performance/Economics

• HPS and metal halide lighting is twice as efficient as mercury vapor lighting, four times more efficient than halogen, and eight times more efficient than incandescent lighting.

Resources/Links

Energy Conservation for Housing – A Workbook, HUD, September 1998. Pages 7-133 through 7-136 address converting exterior lighting fixtures.

Energy Performance Contracting for Public and Indian Housing: A Guide for Participants, HUD, February 1992. Pages 27 and 28 address lighting upgrades using performance contracting.

Consumer Guide to Home Energy Savings, American Council for an Energy Efficient Economy, 1999, ISBN 0-918249-38-4. Pages 177 through 178 address converting exterior lighting fixtures to energy efficient HID and halogen lighting.

Lighting. Part of the U.S. Department of Energy's Consumer's Guide. Learn about lighting design, controls, types, and maintenance.