A flat luminaire with dimensions 1.2 x 0.2m is mounted in a ceiling. The fixture has an opal plastic plate at the bottom, and can be considered ideal diffused. On a wall in the room there is a picture with dimensions 0.4m x 0.4m, as shown in the figure. The measurements apply from the midpoint of fixture and picture. The luminous flux of the light source is 6200 lm. The luminous intensity normally from the bottom of the luminaire is 1400 cd. a) Determine the luminous flux going out of the luminaire. What is the luminaire's efficiency?

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