How to Calculate the Amount of Necessary Lamps

Know how many bulbs you must use per square meter is always a recurring issue, both for those who are going through a reform at home and for professionals. As each room presents several variables (Windows, chosen color for the walls, etc.), it is advisable to call a lighting designer to perform this task. But it is also possible that you even make that calculation, and we’ll teach you how.

How to Calculate the Amount of Necessary Lamps

Understanding Lumens and Watts

Have you read about the difference between lumens and watts in our blog, but it’s worth remembering quickly.

The measure in Watts refers to the amount of energy consumed by the lamp, while the lumen is a measure of the brightness. The LED is the lighting that consumes less, getting between 4 and 19W depending on the lamp, while an incandescent can consume up to 200W.

The luminous efficiency of a lamp is measured by the amount of lumens for each Watt consumed. Thus, the smaller the number of Watts and lumens, more efficient is the lamp.

How to Calculate the Amount of Necessary Lamps 1

Amount of light

The amount of light is measured in lumens and lux. While the first is related to the intensity of the light, the second reveals the amount of light per square meter.Almost all the lamps bring the lumens value described on the packaging.

Get to work

Some environments like offices need a bright lighting, while in others it should be smoother, as in a room. So the amount of lux is usually different for every room. To facilitate, the average light used-without taking into consideration other variables – is the following:

  • Kitchen: 300 lux.
  • Kitchen countertop: 750 lux.
  • Room: 300 lux.
  • Bathroom: 300 lux.
  • Living room: 300 lux
  • Service area: 200 lux
  • Dining room: 200 lux
  • Office: 300 lux

Then, measure the width and length of the room, and multiply a value by another.The result of this account is measured in square meters (m ²), first value we need.

How to Calculate the Amount of Necessary Lamps 2

To know the value of lux a lamp, it is necessary to calculate the value of lumens per Watt of the product: this is the second value that we will need. If you want to use more than one type of lamp, it will need to make an account for each one of them.

Dividing the value in m ² of the environment by the number of lux, you discover the amount of necessary lamps for the environment.

For example, if your choice is a LED lamp 10W, with 800 lumen luminous flux (lm) and efficiency of 80lm/W, for a kitchen with 5 m you will need 5 times the average amount of lumens, 1500. The lamp has 10W and 80 lumens for W, which is equal to 800lm. By dividing the value of lumens necessary for lm/W lamp (1500/800) find the value of 1.875, which means that it will take two lamps to illuminate the environment.

How to Calculate the Amount of Necessary Lamps 3

Watch variables

The values of lumens that we here are the default values, but each environment has different lighting needs. Walls with dark colors require more light, as well as high ceilings, so round up results. Offices, closets and bathrooms also need more brightness, unlike bedrooms, living and dining rooms. In environments that need to be more enlightened, complement the project with luminaires or spots in places that require more light.

Lighting Designer in Rio de Janeiro

It is important to remember that these tips may not represent the environment you want to illuminate. Because of this, indicated is always count with a professional to get the best possible lighting.  According to Incredibleflashlight.com, the PD LED account with lighting designers that can help you with this task, and with the best LED light bulbs to illuminate your House the consuming the least amount of energy possible. Contact us and schedule a visit to our consultants to start your LED lighting project .

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