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(2) Phototube photocell. A periodic checkup should be made every 6 months. The windows should be cleaned and all tubes replaced. Replaced tubes should be checked by a competent tester and discarded if poor. Any extensive maintenance work should be considered justification for replacing with a solid-state type.

(3) Solid-stat e photocell. Failure of this type is denoted by lights being on during daylight. If clean­ing the window does not correct the malfunction, the unit should be replaced. The high repair labor cost usually exceeds the replacement cost.

SECTION III-LIGHT DISTRIBUTION

6-9. Light distribution standards.

Industry standards regulate outdoor lighting de­sign. Luminaires are designed to provide light dis­tributions to meet the design standards by focusing the light into the patterns, beam spreads, or cutoffs as applicable.

6-10. Roadway lighting.

IESNA's Lighting Handbook lists five basic distri­butions. Figure 6-1 and the distribution discussions following have been provided to simplify IESNA definitions.

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