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    • Denggle > Lighting News >

    Prioritize Photometrics In Outdoor Lighting Retrofits

    Prioritize Photometrics In Outdoor Lighting Retrofits

    Source： ledsmagazine 15 Jan 2019
    Outdoor Lighting

    Too often, people involved in lighting retrofit projects make assumptions. One of the biggest is that a one-for-one replacement of an outdoor pole light will create an acceptable result. Unfortunately, this is not always straightforward.

     

    In a new construction project, a photometric plan is typically drawn up. However, since many lighting contractors do not have the capability to handle photometric designs in-house, if they expect to replace fixtures on a one-for-one basis, they are unlikely to spend the time on photometrics. On those rare occasions they do incorporate the plan into a project, they rely heavily on lighting manufacturers to execute it for them. Lighting specifiers and installers are often pitched by LED lighting manufacturers claiming to provide this service as a value-add, but it can create delays with the project; or, depending on the experience level of the designer, photometrics can be rushed, resulting in a less-than-optimal design.

     

    It’s well established that replacing a 400W metal-halide (MH) area light fixture with a 100–150W LED fixture will result in crisper and brighter illumination, so many contractors skip the photometric process and start installing as quickly as they can in order to move on to the next project. This mistake not only can negatively impact your bottom line but it can do the same to a customer’s overall satisfaction.

     

    Before diving in to how delivering photometric plans can both enhance your business and improve customer relationships, it is important to understand some of the basic elements of a photometric design.

     

    At its basic level, a photometric design is a simulation of a lighting plan that can give the user a 2D and/or 3D view of the illumination provided by installing new LED lighting. It gives installers and specifiers the ability to determine what configuration of lighting fixtures will produce the best illumination for the outdoor application. The photometric design involves calculating both horizontal and vertical illuminance (brightness). Think of the horizontal measurement as the amount of light that lands on a horizontal surface, such as across the parking lot. The vertical measurement is the amount of light measured on a vertical surface such as a building wall. The measure of illuminance that we all know and use each day is called foot candles (mainly in the US) or lux (outside the US). One foot candle is defined as 1 lm/ft2.

     

    Other important elements of a proper photometric design include BUG ratings, foot-candle ratios, optics, CCT, tilt, orientation, and roll.

     

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