Also, you will need to place the lights near the walls and make sure that the light fixtures are spaced at least 3 inches away from insulation. Lastly, you need to consider the interior painting theme. For instance, if the shades of walls and furniture are lighter, then you may need lesser number of recessed lamps.
But if you have darker walls with leather furniture, then you may need more lamps. The spacing, placement, and arrangement of recessed lights mainly depends on the function that you want them to perform. Here are a few techniques that you could draw inspiration from.
Wall Washing Lights
Here, one wall of the room is completely illuminated with recessed lights. It typically highlights a piece of art or wall hanging on this wall, which is essentially the focal point of the entire room. Such an arrangement lends sophistication to the interiors with minimum efforts and lesser lights.
To install recessed lights using this, determine the spacing area. Divide the entire length of the wall by the wattage setting which is guided for wall washing. For eg, 100 watt is recommended for 2 feet, 150 watts is recommended for 4 feet, and 150 watts is recommended for 3 feet. Once you get the calculation right, install the lights at the same distance.
Another popular technique is the grazing technique. This technique also is used for highlighting a focal point of the room. It may be a wall, a frame, or a fireplace. The process of determining the space between two recessed light fixtures is the same as that in wall washing technique.
The spacing of the lights will vary based on the design that you will choose. No matter what you choose, ensure that you space them in such a way that the sides of one light should overlap with the other. If you're using only down lighting, then maintain at least 25 sq ft of floor distance, between the two lamps.
Techniques that space recessed lights to highlight an area, are totally different. Since these are not related to overall lighting of the room, you can subtly add the lights on the section that you want to highlight. The spacing depends on the subject that you have selected to highlight and wattage of the light bulbs that you are using.
When it comes to highlighting, make sure that the lights are placed at least 3 feet away from the wall. Most of the time, 50 watts and 75 watt bulbs are placed 2 feet away from the wall. But, smaller bulbs like 25 watts are placed 3 feet away from the wall.
According to some experts, another rule to calculate the spacing, is by measuring the height of the ceiling and dividing it by two. The figure that comes as an answer (in feet) is the distance that you would want to maintain between two lighting fixtures. For a lower or drop ceiling, which is typically 6 to 7 feet high, space the lights more sparingly.