Make sure your lighting system meets IESNA and NYC codes. Achieving the exact specified values is not feasible, but a lighting design is satisfactory if the variation is slight. When specifying a lighting system, design engineers aim for the illuminance values established in the IESNA Lighting Handbook. Illuminance levels for each location are not arbitrary they are established by industry organizations such as IESNA (Illuminating Engineering Society of North America). In the case of New York City, meeting the lighting efficacy requirements of the NYC Energy Conservation Code is also important. The concept of illuminance describes lighting delivered per unit of area, and it is typically measured in foot-candles (lumens per square foot) or lux (lumens per square meter). The purpose of lighting calculation is to reach a suitable illuminance level for the intended application. For the calculation procedure they consider the project’s location, indoor or outdoor, as well as environmental conditions like temperature and dirt. Lighting designers use the photometric data of proposed fixtures as a starting point. Like in any building system design, the optimal capacity can only be specified with an adequate calculation procedure. A well-designed lighting system provides just the right amount of light for its intended application: less lumens yield poor performance, but more lumens represent wasted energy.
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