Correct calculation of the number of spotlights per room

If you decide to make lighting in the house using spots, one of the main steps that must be performed correctly is to calculate their exact amount on the ceiling. There are several basic calculation methods - according to the formula, through online calculator for calculating room lighting either relying on the optimal value. Next, we will tell the readers of the site Sametrick.ruhow to calculate the number of spotlights in a room.

Content:

Method No. 1 - Generally Accepted Standard
Method number 2 - Formula

Method No. 1 - Generally Accepted Standard

For a long time there is the so-called optimal level of lighting for one square meter of the room. According to the generally accepted standard, at 1 m² need to calculate 20 watts of power incandescent lamps. This method cannot be called the most accurate and recommended, but still if you are too lazy to carry out calculations according to formulas, you can simply rely on these numbers.

For example, if you have a living room 3 * 4 (12 squares), then you need to dial so many spotlights so that their total power is at least 240 watts.

Method number 2 - Formula

You can also find out how many spots are required by calculating the area of a room. The calculation formula is as follows:

N = (S * W) / P;

Where:

N is the required number of spots;
S - room area, m²;
W is the specific power of the light flux, (W / m²);
P is the power of one spotlight.

The first question you have is “where to get the value of W?”. This is a tabular value, which just helps us to choose the appropriate illumination for the room. To calculate the number of spotlights, use this table:

If you decide to install LED bulbs, then use the following values:

We draw your attention to the fact that this formula is suitable only for rude household calculations since it does not take into account the height of the ceiling, its material (suspended, suspended or rack), the type of lighting (primary or secondary), the finish and color of the walls, and other important factors. You can also accept your specific power by choosing brighter or dimmer lights in the kitchen, bathroom or living room!

As an example, we show how to calculate the number of fixtures on the ceiling in the corridor. Take an approximate area of 10 squares. According to the table, the illumination level is taken 1 W (for led bulbs), and we buy spots at 5 watts. Total we get:

N = (10 * 1) / 5 = 2 pieces;

As you can see, according to the calculation, we need 2 spots for normal corridor lighting.

We also recommend watching a video in which the specialist provides the described calculation technology:

Calculation Example

It should also be noted that if the ceiling height in the house exceeds 3 meters, the specific power of the light flux must be increased by 1.5 times in the calculations. We hope that now you know how to calculate the number of spotlights according to the area of a room!

Calculation Example