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ENERGY EFFICIENT INVESTMENTS INC.
Nashua South High School
ECM 1- LED Lighting
The schools currently utilize a combination of T8 and TS fluorescent lighting. EEI proposes replacing the
existing fixtures with new LED lighting. EEI performed a detailed survey of the interior and exterior spaces
in order to identify opportunities in which we can improve lighting quality, reduce maintenance costs, and
save energy.
The existing lighting demand (kW) per fixture, hours of operation, fixture quantities, and recommended
retrofits are based on the physical inspection and site visits conducted by EEI in 2018. As a result of the
survey and analysis, EEI has developed a high efficiency lighting upgrade project that will provide the
schools listed with new LED fixtures with controls, resulting in guaranteed annual energy savings and a
reduction in electrical demand.
LED type lighting provides significant illumination, has longer life expectancy, increased savings in electric
consumption, and provides dimming capabilities. Also, by standardizing all fixtures will reduce future
maintenance requirements.
LED fixtures in a school environment have an estimated life of more than 20 years. There is significant
maintenance savings when LED fixtures are used due to their longer lifespan.
All light energy eventually converts to heat. The conversion to LED fixtures will reduce the building’s
lighting energy intensity (kW/sq. ft), therefore impacting the HVAC heating and cooling loads. Converting to
LED lighting will eliminate 3,270 mmBTU waste heat annually. The reduction in lighting waste heat will
increase the HVAC load during heating season, approximately 13,998 therms annually. Conversely, the
HVAC load will decrease in the cooling system, approximately 65,325 kWh annually. The net HVAC utility
impact is an increase in cost of approximately $4,199. This increase in cost has been subtracted from the
energy savings for the ECM.
Install (3,860) LED 2x4 and 2x4 retrofit fixtures with Spacewise control and wireless dimming capability
Install (260) LED high bay fixtures with Spacewise control and wireless dimming capability
Install (642) LED recessed can fixtures
Install (2,947) LED tubes and (1,644) LED drivers
Install (193) LED lamps
Install (47) LED round decorative fixtures
IPMVP Option A, Retrofit Isolation with Key Parameter Measurement, has been chosen for this ECM. This
option has been chosen because the only parameter changing in the implementation of this ECM is the
fixture input wattage. EEI will use current transducers to measure a20% sample of the fixture input wattage
before and after ECM implementation.
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