EE - Illumination

A 100 candela lamp emits light uniformly in all directions and is suspended 2m above the center of a working table which is 3m square. Calculate the illumination at each corner of the table.

At what distance from a wall will 40 Cd lamp provide the same illumination as 80 Cd lamp located at 4 m from the wall?

An office, 17 m x 8m wide is lighted by 8 lamps and each lamp has a luminous intensity of 200 Cd. Allowing an absorption loss of 4,000 Im for the reflectors, walls, and ceiling. Calculate the average illumination on the working plane.

A light source has an illumination of 100 footcandles (fc), what is the illumination in lux?

For indoor lawn tennis, what is the recommended level of illumination for tournaments in foot-candles (fc)?

What is the total flux emitted by a lamp having an intensity of 50 candelas?

A room measuring 16m by 8m is to be illuminated by 8 lamps with an average illumination of 72 lm/sq.m at floor level. If 40% of the total light emitted is absorb by the walls and ceiling, calculate the mean spherical candle power required for each lamp.

A certain light source produces an illumination of 800 lux on surfaces. Find the illumination of 800 lux on surfaces. Find the illumination on that surfaces if the distance to the light is doubled.

A road is illuminated by two 500 candela lamps placed 6.1 meters above the center line of the road and 18.3 meters apart. Find the illumination produced on the surface of the road at a point on the center line midway between lamps.

What is the burning hours that should be used in the design consideration of incandescent bulb?

How far from a 150 Cd light source would a picture have to be placed so as to receive the same illumination as when it is placed 12m from an 85 Cd light source?

A room with dimensions of 72 ft x 36 ft x 13 ft requires 50 footcandles, maintenance factor of 0.7 coefficients of utilization of 0.46 and RI of 4. Calculate the required lumens output of the lamps.

A light source located 2.75 m from a surface produces an illumination of 528 lux on the surface. Find the illumination if the distance is changed to 1.55 m.

A floodlight emitting 25000 candelas in the center of its beam is aimed at 60 degrees to a point on the ground 20 meters away. The illumination of the point is,

A uniform light source gives 2500 lm and is suspended 3.2 m above the center of a horizontal floor, 4m square. Find the illumination in lux at a point on the floor directly below the light source.