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![]() ![]() ![]() Calculate s/Hp for within-row and between-row spacing of light fixtures.Divide the number of fixtures per row by the row length (120 feet in this case). Determine spacing between fixtures in each row (Dj in Table 11.8).Divide the number of rows by the width of arena (60 feet in this case). Determine spacing between rows of lights (D2 in Table 11.8).Divide total number of lights by the number of rows. Calculate the number of fixtures in each row if the arena is provided with two, three, or four rows of lights.Fewer fixtures are not necessarily better if light uniformity will not be adequate. Divide total arena riding area (7200 square feet in this case) by light fixture illumination area (square feet per lamp from Table 11.7) for each lamp type. Determine the total number of fixtures needed.Each option is assigned a letter-number (A1 through J3) for identification during the example discussion.Ĭalculate fixture number and spacing needed: Options, calculations, and results are provided in Table 11.8.Try only the larger wattage metal halide lamps because the low-wattage lamps illuminate a rather small area for this application.Try all three high-pressure sodium wattage fixtures with reflector and refractor and because of less light output with only a refractor, try only the two larger watt lamps.Evaluate all four types of HID fixtures featured in Table 11.7 (high-pressure sodium and metal halide, both with and without reflectors) to see if one offers superior application to the other three.Four rows of lights are also considered and would need to be evaluated for wider arenas.Ĭhoose various lighting options to evaluate: ![]() This relatively small 60-foot-wide, but standard, arena size will consider two or three rows of lights parallel to the long sidewall of the building.Need uniform light with s/Hp of no more than 1.8 with designs to 1.0 desirable to minimize shadows.Minimize shadows to reduce light and dark patches that may be unsettling to horses. Provide at least 20 footcandles of light 30 foot-candles for bright interior (Table 11.1).For a riding arena the floor is the important light plane so if lamps are mounted under the 16-foot-tall truss and the fixture height is about 2 feet, then distance Hp is 14 feet.Mount light fixtures on truss bottom chord. An arena of 60 feet by 120 feet has 7200 square feet of riding surface area. ![]() |
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