Use the recessed lighting calculator on this page to calculate the placement and spacing for general lighting in a room. Just select the layout, enter the room’s dimensions, and hit calculate. You can also use the calculator to determine the placement for recessed task lighting above a surface by using its dimensions rather than the entire room.

Select a layout:

Measure the area and enter it here:

Light levels are NOT calculated or suggested. This calculator gives payback time, and both the annual and life-time savings figures for energy, maintenance, and CO 2 production. It calculates Lighting Power Density from area of at least 50 square feet per fixture, and provides the maximum fixtures allowed from a target LPD. Determine what is power consumption of your street light. The first step in designing a solar street light system is to find out the total power and energy consumption of LED light and other parts that will need to be supplied by solar power, such as WiFi, Camera etc. Need to be supplied by the solar PV system.

Length (in inches):

Calculate the distances:

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Street Lighting Calc 2000

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Street Lighting Calc 2019

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Visual lighting calc
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Street Lighting Calc 2019

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Note: You can actually use any format with the calculator – inches, centimetres, or feet. I recommend using inches or centimetres rather than feet because it is more precise.

Obviously this calculator does not cover all of the possible room shapes, layouts, or quantity of recessed lights a room may need. However, it should give you an idea of how to apply the formula for the placement and spacing of recessed lighting.

If you’re unsure where to begin, you can also use our general lighting calculator to help you determine how many recessed lights the room needs.


As an LED light manufacturer, we get several queries from customers like:
  • how many led lights do i need to light a room?
  • how many lumens do i need for living room?
  • how many led downlights do i need per room?
  • how to calculate how many lights are needed in a bedroom?
  • What amount of lumens required per sq ft for showroom?
So, we have come up with LED light Estimator to meet need of all the customers. Use our light requirement calculator to find out maximum led light output (lumen and wattage) required to illuminate your room depending on type, size and specified light level. We have illustrated number of led lights required for your room type with different options of our various LED lighting products in table form. for example, to find number of led lights in showroom or shop, select room type as showroom or shops. Make sure you plan led downlight spacing according to suggested lighting layout.
NOTE: Please choose proper unit of your room area to help us count led lights (Lux and watts calculation) required per square foot/meter/inch. This Lumen calculation formula is using predefined standard LUX Levels required for different room types. Result may defer according to spacing layout of led lights and position from wall.

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