1 Protective lighting 0.2 175-watt mercury refractor mounted 25 feed high for lighting 8,000 sq. 1 Typical installation based on ratings of clear mercury lamps. 2 Distance between lamps should not exceed 5 times mounting height. System plans and layout Specific factors affecting overall performance of lighting systems are room size and height, color of walls, ceiling and equipment, type of lamp and luminary, and lamp height and spacing. Generally speaking, most luminaries can be suspended from 7 to 10 feet above the floor in poultry buildings.
Interior surfaces can have from medium to average reflectance values.
Lamp and luminary height and spacing is related to the uniformity of light to be obtained. If the lighting level is to be higher than 10 foot-candles, the lamp spacing should be limited to its mounting height. With either, the distance of outside lamps to walls should be no more than one-half the distance between lamps. A typical problem can serve to illustrate how the data can be applied. Let us assume that we must plan a lighting system for a 20 x 40 foot egg handling room with light colored walls and ceiling.