2 Photometry (18 points) Fixtures A and Fixture B are 2'x4' two-lamp fluorescent luminaires. Their candlepower distribution is as shown below. Find the illuminance levels at point a and point c. Show units and calculations. 800 150 Fixture A Fixture B 600 200 120 200 5 f 7 ft 200 2 ft 400 a GO 2.5 mt 500 3 ft 3 ft Point a: Fixture A Fixture B Fixture A + B luminous intensity distance from luminaire angle of incidence 0 illuminance Point c: Fixture A Fixture B Fixture A + B luminous intensity distance from luminaire angle of incidence e illuminance