Recessed Lighting

General Lighting
General service "A" bulbs (in recessed fixtures) provide wide light distribution. "R" and "PAR" bulbs concentrate light. Coverage per fixture is based on providing 15 to 25 footcandles of light. In rooms with darker color use higher wattages.

Number of fixtures needed in a given area: consult ALA showroom experts for manufacturer's literature. The "spacing ratio" number must be multiplied by the fixture's mounting height above the lighted area (tabletop, floor, counter, etc.) to give the maximum spacing for even illuminations.

Fixture Trim

"A"Bulb

"R"Bulb

 

75w

100w

150w

50w

75w

150w

Cone

Baffle

Lens

Diffuser

25

20

25

20

40

30

35

30

50

50

55

45

15

10

--

--

30

25

--

--

65

60

--

--

 


Wall Washing
Use the chart to choose the desired light level. Find the spacing (S) for the fixtures. For the required number of fixtures, divide the length of wall by spacing (S). Place the fixtures the same distance from the wall as (S). Example: For Medium Light Level with wall washers with 100W "A" bulbs, five fixtures are needed to wash a 10-foot wall.

Lamp & Wattage

Spacing(s) for
Medium Level
(15-20 footcandles)

Spacing(s) for
High Level
(30-45 footcandles)

100W "A"

2 ft.

--

150W "A"

4 ft.

2 ft.

150W "R"

3 ft.

2 ft.


Accent Lighting
Use the chart to select a bulb for the size of beam desired to accent the subject. Light levels range from 20 to 60 foot-candles at the center of the beam. Example: A 2-foot. mounting distance, a 50W "MR-16FL" bulb will cast an 8 x 3-foot beam.

Lamps aimed 30 degrees from vertical.
(L) & (W) indicate where candlepower drops 50% of maximum.

Distance from Wall (D)

Lamp
Selection

Beam
Length (L)

Beam
Width (W)

2 Feet from Wall
(8 ft. Ceiling)

50W PAR-36 WFL (12V)

5 ft.

2.5 ft.

50W MR-16 FL (12V)

8 ft

3 ft.

75W R-30 SP

4.5 ft.

2 ft.

75W R-30 FL

Wall Bottom

7 ft.

3 Feet from Wall
(10 ft. Ceiling)

75W PAR-38 FL

5.5 ft.

2 ft.

25W PAR-36 NSP(12V)

2 ft.

1 ft.

50W MR-16NSP (12V)

2 ft.

1.5 ft.

50W MR-16 NFL (12V)

5.5ft.

3 ft.

75W PAR-38 SP

3 ft.

1.5 ft.