Bi-level Exterior Lighting Requirement

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Bi-level exterior lighting required


Most commercial building energy codes require that exterior lighting be turned OFF when not in use via a time- or daylight-based control. Now a growing number of codes based on ASHRAE/IES 90.1-2010 require that exterior luminaires that remain ON after normal business hours, must have the lighting power reduced during that time.

The approach basically requires that lighting power be reduced automatically during a certain time of night, and that light and power subsequently be raised and lowered based on whether the lighted area is occupied. This involves using an occupancy sensor that changes the lighting state from a low (typically 30- to 70% of rated power, but can be even lower) to a high setting. The approach is compatible with any light source having typical use in exterior lighting applications.

An example of how effective and important bi-level dimming can be for outdoor lighting is a car dealership. Dealerships owners desire the perfect quality of lighting to showcase their inventory on the lots and the right amount of lighting 24 hours a day for safety. See this short animation that highlights a car dealership lot to show bi-level control in action using the D-Series LED Area luminaires by Lithonia Lighting®.

The D-Series LED Area Size 2 luminaires are an efficient selection for automotive applications, suitable for replacing 1000W metal halide fixtures. The average automotive lot with 100 luminaires using 1000W metal halide lamps can spend approximately $4,000 a month in energy costs alone. With the ultra-efficient, D-Series LED Area Size 2, that cost could be slashed by about $800 to $900 a month. With available optics created specifically for automotive dealerships, the Size 2 bathes inventory in bright, consistent light and turns the front row into an outdoor showroom.

Simple and straight forward, bi-level dimming control offers the ability to dim luminaires when little to no traffic on the lot is expected. Using a time clock or other device to establish pre-determined dim periods, bi-level dimming allows significant energy savings to be realized while still providing lot-wide illumination for security purposes. ROAM® wireless outdoor lighting management system allows nearly unlimited control of a parking lot’s light levels. With this advanced feature, the light levels of individual luminaires can be controlled or zonal lighting patterns can be established. Also, the ROAM system offers the ability to control multiple lots from a single location, and it will even monitor luminaire performance and send alerts if maintenance is required.

Camelback Toyota in Phoenix, Arizona is using a ROAM system to reduce energy consumption and maintenance costs. Read about how this dealership is reducing its outdoor lighting energy consumption by 20 to 50% and even boosting lamp and ballast life by at least 25%.

Demonstration projects by the U.S. Department of Energy and the California Lighting Technology Center (CLTC) indicate energy savings potential for bi-level dimming to range from 30 to 75%. For example, CLTC found 40% energy savings with bi-level HID wall-packs versus uncontrolled HID wallpacks. Another 30% in savings was realized after switching from HID to LED as the light source.

Acuity Brands is making the integration of lighting and controls easier by bringing several of the most trusted and innovative brands under one roof. View the entire portfolio of lighting and controls and read more about our complete lighting solutions for every application.



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