![]() ![]() ![]() ![]() ![]() Alternatively for 100 fc calculate number of luminaires. Check predicted footcandles against recommended levels in table. Planning to use 30 luminaires and 2 lamps per luminaire. 48 (graph - reflectances, room cavity ratio 3). Coefficient of Utilization for this luminaire =.20 (on table for cavity ratio 1.2, % floor reflectance = 30, % wall below work plane = 10% Room cavity ratio = 2.9 ceiling cavity ratio = 0.0 (recessed lamps) floor cavity ratio = 1.2 (i.e.Zonal Cavity Coefficient of Utilization Calculation Planning to use 30 luminaires in five continuous rows to provide uniform illumination.ĬALCULATING THE COEFFICIENT OF UTILIZATION LUMINAIRES ETC. distance between lamp rows center to center = 8'. Lamps are replaced as soon as they burn out. Total space including fully recessed luminaires (ceiling) and walls, is cleaned every 19 months. Room is air-conditioned and kept very clean (clean conditions needed for experiments). Working plane - work tables are 3.0 feet above floor walls between luminaire and work plane 50% (0.5).Cornell University Ergonomics Web DEA3500: Ambient Environment: Zonal Cavity BASIC DATAĮxample: Designing lighting for a laboratory ![]()
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