Ch. 13

• front light 30-40 degrees
• light a surface behind

• o Uniform vs. Non Uniform
• o 30 degree angle best
• Minimizes shadow
• Minimizes reflection
• No shadow from viewer

• o Limit UV and Visible radiation
• o Limiting light and heat
• § Evaluate daylight exposure
• White paint is good
• § Evaluate electric light exposure
• filter
• May need UV filter
• Lower footcandles
• § Evaluate duration of exposure
• Remember warmer light is better at lower levels
• Reduce the level and length for success

spacing criterion, is the center to center distance between luminaries (provided by manufacturer)

mounting height calculated by subtracting 30” from the room height or source of light as in the case of a pendant fixture.

• o If a room has 10’ ceilings with recessed fixtures that are used as general ambient lighting how far apart the fixtures should be mounted to create even light levels around the room.
• Wall height=10’
• Mounting height= 7-6” (10’-2’6”)
• Spacing Criterion= 1.5 (provided by the specs)
• Space apart= MH (7.5) x SC (1.5) = 11’-3” (11.25)

• o When spacing fixtures out from the wall, they should be placed parallel to wall and placed parallel to wall and places aprox. 1/3 the height of the wall
• § Ex: If the wall is 10’ high the fixtures would be placed aprox. 3’ out

• o Square rule is used for spacing fixtures side to side: centers of fixtures should be closer than or equal to distance from wall (see above) (remember Mrs. Cox’s drawing on white board)
• § Ex: The fixture place at 3’ from
• wall should be space no more than 3’ from each other.

• o Spacing is similar to individual unit
• o Mock ups are the best test

• o Fluorescent tube lamps work well but not uniform along the full height of the wall
• o Use only on walls from 8’-10’ tall