By Craig DiLouie
Complex lights Controls is edited via Craig DiLouie and written for engineers, architects, lights designers, electric contractors, vendors, and construction vendors and bosses. complex lighting fixtures controls, indicated through examine because the "next immense thing," are actually mandated through the ASHRAE/IES 91.1-1999 power usual, the foundation for all kingdom power codes within the united states, and have gotten the norm instead of the exception in new development. This ebook presents in-depth information regarding the most important tendencies, applied sciences, codes, and layout innovations shaping using today's lighting fixtures regulate structures, together with dimming, automated switching, and worldwide in addition to own keep watch over.
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Extra info for Advanced Lighting Controls: Energy Savings, Productivity, Technology and Applications
Daylighting examples assume a design light level of 55 footcandles at work surfaces. S. ——————————————————————————————— Figure 2-3. Operating cost comparisons for private office and open office spaces, using various types of controls. S. Department of Energy. 50 Advanced Lighting Controls tions for occupancy sensors, such as: • Ceiling-mounted controls with 360° coverage • Ceiling-mounted controls with elongated “corridor” coverage • Wall-mounted controls with a fan-shaped coverage pattern • Ceiling-mounted controls with a rectangular coverage pattern Take note of the difference between each device’s sensitivity to minor motion (working at a desk) vs.
In Figure 1-9, for example, each two-lamp ballast controls one lamp in the luminaire where the ballast is housed, and one lamp in the adjacent fixture. Thus, when the ambient lighting level falls below the predetermined minimum, all lamps are activated. When the ambient lighting level increases to a predetermined point above the minimum but below the maximum the “A” ballasts (or “B” ballasts) are activated creating 50 percent lighting output. At such time when the maximum ambient level is achieved, all electric illumination is deactivated.
Typical applications include churches, restaurants, meeting rooms, and multiuse facilities. Variable Output Ballasts Variable output ballasts represent the latest trend in dimming control technology. In essence, waveform dimmer circuitry is made part of an electronic fluorescent ballast. , multiple photocell inputs to a micropro- 32 Advanced Lighting Controls Figure 1-15. System dimmer. cessor that transmits signals to the ballast), the light output of the lamp or lamps controlled by the ballast is adjusted in a predetermined manner.