Beam Angle Recessed Lighting Layout

Admin 1:35:00 AM
As we discussed later a method to get the required number of light units to create a recessed lighting layout for a specific area or room by using the wattage method and spacing calculations to get the exact placement using a simple formula. Today we are going to use a method to get the most uniform recessed lighting layout based on the light beam angle, beam angle is the angle of the generated light from the light fixture.

beam angle Recessed Lighting Layout


As you see the light out from the recessed can take a cone shape, forming a circle on the floor or the area surface, that became more narrow as you go upward. In that circle light has high intensity at the center and decreased gradually going out from the middle, and the ceiling height is an effective factor on the light circle diameter, as the ceiling height increases the light circle diameter increase. From a practical point of view the light circle diameter slightly more than the ceiling height, but If you want to avoid the time we can consider them equal.

The intensity of the output light also depends on the type of the bulb that produce the light. We need to get proper recessed lighting layout that creates a uniform light pattern over the area you need to light, to get that you need to properly space the recessed lighting. So recessed lighting placement depends on the distance between the light source and the area surface.

We have to be aware about the work plan, when calculating the recessed lighting placement to get the ideal recessed lighting layout, the work plan for general lighting is a virtual plan approximately 2.5 feet above the floor,where activities done, so light beams should intersects at that plan level and for task lighting the work plan is the area surface.

Now we will apply the beam angle recessed lighting layout method to light a room with 10 foot ceiling, 16 feet length, 12 feet width.

So, the light beam circle produced from each recessed fixture is about 10 feet, the working plan is about 2.5  foot from the floor, at this level the circle diameter will be decreased to approximately 7.5 foot, then subtract two feet from the remaining diameter to allow light circles to overlap, now we get the space between each recessed can of 5.5 feet.

Divide the length of the room by the determined space to get the number of recessed cans in the long row, and repeat this step for the width.

16 feet/5.5 feet =2.91        you need 3 can lights in the length row.
12 feet/5.5 feet =2.18       you need 2 can lights in the width row.

The layout will be as shown below

Recessed Lighting Placement 6 units

This method gives you the most even recessed lighting layout, but ignored the most important spacing rule " the distance between recessed lights, double the distance at the end " and dose not identify the bulb output wattage. So, clearly the wattage method is more better.

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