LED CASE STUDIES

City of Denver LED Traffic Lighting Retrofit

The City and County of Denver began to retrofit pedestrian and traffic signals in 1996. This effort involved replacing incandescent lights with high efficiency light-emitting diode (LED) lights. The LED signals have a lifetime of 100,000 hours and consume 14 watts of electricity or less. Also, they are brighter than typical incandescent traffic lights.

The retrofit of red traffic lights and orange pedestrian “Don’t Walk” signals resulted in annual labor and material cost savings of $360,000. Energy savings from replacing the red traffic lights alone amounted to $250,000 annually. Denver netted even more savings with $500,000 in rebates from the local utility.

The City will receive another $96,800 in rebates from Xcel Energy in 2002 as it completes the replacement of more than 13,000 green traffic signals. Yellow LED signal specifications are being finalized and retrofits will begin in 2002 as well.

Toyota Connection

By installing fluorescent fixtures instead of using HID (High Intensity Discharge Lighting) TMMK saves 147 watts per fixture. TMMK has approximately 7000 fixtures in the plant. This saves enough energy to run 7900 36” color televisions.

	During breaks, lunches and in between shifts all of TMMK’s process area lighting is shut off.
	Overhead lighting is wired to motion sensors and will shut off automatically when no movement is detected for 30 minutes.
	TMMK has installed motion sensors in all office areas so lights will turn off automatically and Team Members are turning off computers, printers, and copiers daily, to reduce electricity usage.

Old Style Lighting Fixture 368 Watts

New Style Lighting Fixture 221 Watts

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