Cove Design: In cases where luminaires are to be concealed within a field- constructed continuous cove, the specifier must ensure that the cove is properly designed to conceal brightness from normal viewing angles, without obstructing light intended for the target surface.
When lighting building facades with ground-mounted floodlights, three factors are considered:
Setback
The recommended setback is 3/4 times the building height. If a
building is 30 feet tall, the recommended setback is 22.5 feet from the
building. Locating the floodlight closer to the building will
sacrifice uniformity; setting it farther back will result in loss of
efficiency.
Spacing
The rule of thumb for spacing floodlights is not to exceed two times
the setback distance. If the setback is 22.5 feet, the
floodlights should not be placed more than 45 feet apart.
Aiming
The floodlight should be aimed at least 2/3 the height of the
building. For example, if a building is 30 feet high, the
recommended aiming point is approximately 20 feet high. After
installation is complete, aiming can be adjusted to produce the best
appearance. Mounting a full or upper visor to the floodlight can
reduce unwanted spill light.
When using ground-mounted floodlights to light a sign, the
recommended setback is a distance equal to 3/4 the sign height.
For example, the setback distance for a 12 foot by 6 foot sign would be
4.5 feet. Locating the floodlight closer will sacrifice
uniformity while setting it farther back will result in a loss of
efficiency.
