Lighting 101 : 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	25	40	50	15	30	65
Baffle	20	30	50	10	25	60
Lens	25	35	55	--	--	--
Diffuser	20	30	45	--	--	--

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 foorcandles)	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)
	5DW PAR-36 WFL (12V)	5 ft	2.5 ft
	5DW 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
	75W PAR-38 FL	5.5 ft	2 ft
	25W PAR-36 NSP (12V)	2 ft	1 ft
	5DW MR-16 NSP (12V)	2 ft	1.5 ft
	5DW MR-16 NFL (12V)	5.5 ft	3 ft
	75W PAR-38 SP	3 ft	1.5 ft

** 2 ft from wall (8 ft ceiling)
** 3 ft from wall (10 ft ceiling)