By Craig DiLouie
Complex lighting fixtures Controls is edited by means of Craig DiLouie and written for engineers, architects, lights designers, electric contractors, vendors, and development proprietors and bosses. complex lighting fixtures controls, indicated by way of learn because the "next monstrous thing," at the moment are mandated through the ASHRAE/IES 91.1-1999 power ordinary, the root for all nation strength codes within the united states, and have gotten the norm instead of the exception in new building. This booklet offers in-depth information regarding the main traits, applied sciences, codes, and layout concepts shaping using today's lighting fixtures regulate structures, together with dimming, computerized switching, and worldwide in addition to own regulate.
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Complex lights Controls is edited by means of Craig DiLouie and written for engineers, architects, lighting fixtures designers, electric contractors, vendors, and construction proprietors and executives. complex lights controls, indicated via study because the "next enormous thing," at the moment are mandated by means of the ASHRAE/IES ninety one.
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Extra info for Advanced Lighting Controls: Energy Savings, Productivity, Technology and Applications
The actual energy savings to be achieved depend heavily on specific application factors such as glazing area and design illuminance. In most cases, savings of 30 percent or more of the lighting energy used in daylight-controlled areas can be achieved. If the entire space is uniformly skylighted, these savings can accrue on the entire lighting load. More commonly, they apply only to the perimeter zone of a vertically glazed installation. Note that the amount of energy to be saved by a daylight harvesting system does not increase dramatically when the minimum output level available from the dimming system is less than about 25 percent.
Large-area waveform control gear or voltage reduction equipment may be well suited for such applications, although the limited dimming range of voltage reduction gear may be too restrictive in some cases. Perimeter-zone applications are more design-sensitive; proper photocell selection and placement are critical. Several techniques are being employed to help assure that photocell input is proportional to 34 Advanced Lighting Controls the amount of light on tasks in the space. No single technique is best for all applications; each application must be evaluated individually, and for that reason, designers should ask manufacturers to supply a calibration procedure for the particular type of application.
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. A similar approach can be accomplished through reliance on multiple-level ballasts, where code permits. A solid-state phototiming device also is available for outdoor applications (Figure 1-10).