Registered Electrical Engineer — Supply & Distribution (China)

Practice session

An open-plan office has dimensions Length L = 20 m, Width W = 10 m (Floor Area A = 200 m²). The target maintained average illuminance is Eav = 300 lx. Recessed LED luminaires with rated luminous flux Φ = 3600 lm per luminaire are used. Given coefficient of utilization U = 0.60 and maintenance factor K = 0.80, how many luminaires (N) are required using the lumen method (利用系数法)?

Loading your practice session…