Recessed Lighting Placement Calculations

Admin 11:30:00 PM

In this tutorial, you will learn recessed lighting placement calculations by examples but first, you should read  recessed lighting spacing to understand this simple formula, which tells you where to place the light units in your recessed lighting layout.


A room dimensions are 15 feet long (L=15) and 10 feet wide (W=10)
So, total area is 150 square foot and total wattage required for this room=150*1.5=225 watt.
-By using 60W bulbs, you will need four bulbs to effectively light this room.

Recessed Lighting Placement calculations for 4 bulbs

Recessed Lighting Placement four units

  • The distance between bulbs in the long rows =L/N =15/2=7.5 foot.
  • The distance between first bulb and the wall in the long rows =7.5 foot/2 =3.75 foot.
  • The distance between bulbs in the width rows =W/N =10/2=5 foot.
  • The distance between first bulb and the wall in the width rows =5 foot/2 = 2.5 foot.

- By using 40W bulbs, you will need six bulbs to effectively light this room.

Recessed lighting placement calculations for 6 bulbs:

Recessed Lighting Placement six units

  • The distance between bulbs in the long rows =L/N =15/3= 5 foot.
  • The distance between first bulb and the wall in the long rows =5 foot/2 = 2.5 foot.
  • The distance between bulbs in the width rows =W/N =10/2=5 foot.
  • The distance between the first bulb on the wall in the width rows =5 foot/2 = 2.5 foot.

A room dimensions are 16 feet long (L=16) and 12 feet wide (W=12)
So, total area is 192 square foot and total wattage required for this room=192*1.5=288 watt.
- By using 60 W bulbs, you will need five bulbs to effectively light this room.

Recessed lighting placement calculations for 5 bulbs

Recessed Lighting Placement five units
  • The distance between bulbs in the long rows =L/N =16/2= 8 feet.
  • The distance between first bulb and the wall in the long rows =8 foot/2 = 4 feet.
  • The distance between bulbs in the width rows =W/N =12/2=6 feet.
  • The distance between first bulb and the wall in the width rows =6 foot/2 = 3 feet.
  • The fifth bulb should be in the middle (L/2,W/2) =(8,6) foot.

- By using 40W bulbs, you will need eight bulbs to effectively light this room.

Recessed Lighting Placement calculations for 8 bulbs :

Recessed Lighting Placement eight units

  • The distance between bulbs in the length rows =L/N =16/3= 5.3 feet.
  • The distance between first bulb and the wall in the long rows =5.3 foot/2 = 2.66 feet.
  • Bulbs in the middle row are equally spaced apart and from the wall 16/3 =5.3 feet.
  • The distance between bulbs in the width rows =W/N =12/3=4 foot. but remember there is a virtual place in the middle,so the distance will be doubled (2*4) =8 feet.
  • The distance between first bulb and the wall in the width rows =4 foot/2 = 2 feet.
  • Bulbs in the middle row are equally spaced from the wall 12/2 =6 feet.

As you see Recessed Lighting Placement calculations are simple and always tend to Space your fixtures evenly. Once recessed lighting placement exact locations determined, you should find out if they can be installed in these particular locations. You can use a stud finder and determine where the ceiling joist are located. You may have to adjust placement locations to avoid hitting a ceiling joist.

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