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While many luminaires can be adjusted to produce more than one pattern, no luminaire is suitable for all patterns. Care must be used, especially in repair and replacement, to install the proper luminaire for the designed pattern, as specified in manufacturer's literature. Even when the proper luminaire is installed, care must be used to ensure all adjustments have been properly made to produce the desired results.

a. Type I. The distribution of (a) is intended for narrow roadways with a width about equal to lamp mounting height. The lamp should be near the center of the street. The variation of (b) is suitable for intersections of two such roadways with the lamp at the approximate center.

b. Type II. The distribution of (c) produces more spread than does type I. It is intended for roadways with a width of about 1.6 times the lamp mounting height, with the lamp located near one side. The variation of (d) is suitable for intersections of two such roadways, with the lamp not near the center of the intersection.

c. Type III. The distribution of (e) is intended for luminaires located near the side of the roadway with a width of not over 2.7 times the mounting height.

d. Type IV. The distribution of (f) is intended for side-of-road mounting on a roadway with a width up to 3.7 times the mounting height.

e. Type V. The distribution of (g) is circular and is suitable for areas and wide roadway intersections. Types III and IV can be staggered on opposite sides of the roadway for better uniformity in lighting level, or for use on wider roadways.

6-11.

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