{"id":18452,"date":"2025-03-21T15:39:47","date_gmt":"2025-03-21T07:39:47","guid":{"rendered":"https:\/\/sunmelighting.com\/?p=18452"},"modified":"2025-03-21T15:39:47","modified_gmt":"2025-03-21T07:39:47","slug":"%d1%87%d1%82%d0%be-%d1%82%d0%b0%d0%ba%d0%be%d0%b5-%d1%83%d0%b3%d0%be%d0%bb-%d0%bb%d1%83%d1%87%d0%b0-%d0%b2-%d0%be%d1%81%d0%b2%d0%b5%d1%89%d0%b5%d0%bd%d0%b8%d0%b8-%d0%b8-%d0%ba%d0%b0%d0%ba-%d0%b5%d0%b3","status":"publish","type":"post","link":"https:\/\/sunmelighting.com\/ru\/what-is-a-beam-angle-in-lighting-and-how-to-choose\/","title":{"rendered":"\u0427\u0442\u043e \u0442\u0430\u043a\u043e\u0435 \u0443\u0433\u043e\u043b \u043b\u0443\u0447\u0430 \u0432 \u043e\u0441\u0432\u0435\u0449\u0435\u043d\u0438\u0438 \u0438 \u043a\u0430\u043a \u0435\u0433\u043e \u0432\u044b\u0431\u0440\u0430\u0442\u044c?"},"content":{"rendered":"

Beam angle is a simple metric that helps you optimize the light coverage inside your house or building. Any modern lighting work involves beam angle and light spread calculations. Beam angle is often used in lighting work, but few people know its details and uses.<\/p>\n

So here is a detailed guide to help you understand all about beam angle in lighting<\/a> and choose the perfect beam angle for your needs.<\/p>\n

What is beam angle?<\/h2>\n

Beam angle measures the dispersion of light from a light source (such as a light bulb). The larger the beam angle, the more scattered light there is, but the intensity of the light is also lower. Conversely, the narrower the beam angle, the less scattered light there is, but the intensity of the light is higher.<\/p>\n

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This light intensity is usually measured in lumens. Lumens per square meter are called “lux<\/strong>” and lumens per square foot are called “foot candles<\/strong>.” The total lumens needed to light a room will vary depending on the type of light and the size of the room.<\/p>\n

Examples:<\/h4>\n
1. What does 120 beam angle mean?<\/h5>\n

120 refers to the angle of the fixture. A 120\u00b0 angle is a wide beam angle for a bulb that can cover an entire room if the ceiling is high enough.<\/p>\n

2. What does narrow beam angle mean?<\/h5>\n

Narrow beam angle refers to bulbs with a beam angle less than 30\u00b0. However, there are more detailed categories of beam angle, such as spot angle or narrower beam angle.<\/p>\n

3. Common beam angles<\/h5>\n

There are two ways to refer to beam angle. One uses degrees, such as 10\u00b0, 60\u00b0, 120\u00b0, etc. The other uses terms, such as narrow beam angle, spot angle, wide, wider angle, etc.<\/p>\n

The terms and standards for beam angle are not universal, but the NEMA classification is the most commonly used. NEMA is the National Electrical Manufacturers Association, the largest association of electrical equipment manufacturers.<\/p>\n\n\n\n\n<\/colgroup>\n\n\n\n\n\n\n\n\n\n\n
Beam Angle (\u00b0)<\/th>\nNEMA Type<\/th>\nDescription<\/th>\n<\/tr>\n<\/thead>\n
10\u00b0 \u2013 18\u00b0<\/td>\n1<\/td>\nVery Narrow<\/td>\n<\/tr>\n
18\u00b0 \u2013 29\u00b0<\/td>\n2<\/td>\nNarrow<\/td>\n<\/tr>\n
29\u00b0 \u2013 46\u00b0<\/td>\n3<\/td>\nMedium Narrow<\/td>\n<\/tr>\n
46\u00b0 \u2013 70\u00b0<\/td>\n4<\/td>\nMedium<\/td>\n<\/tr>\n
70\u00b0 \u2013 100\u00b0<\/td>\n5<\/td>\nMedium Wide<\/td>\n<\/tr>\n
100\u00b0 \u2013 130\u00b0<\/td>\n6<\/td>\nWide<\/td>\n<\/tr>\n
130\u00b0 or more<\/td>\n7<\/td>\nVery Wide<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Why is beam angle so important?<\/h2>\n

Beam angle helps determine light coverage; the larger the angle, the greater the coverage, and vice versa. To fully cover the floor of a 40\u00d740 square foot room, you would need one 60\u00b0 lamp centered on a 34-foot-high ceiling, or two 60\u00b0 lamps 10 feet from the center of a 17-foot-high ceiling.<\/p>\n

Proper light spread calculations allow you to achieve a fully illuminated<\/a> room using the fewest fixtures.<\/p>\n

Low or narrow beam angle lighting can also be a stylistic choice for accent or mood lighting.<\/p>\n

How to measure beam angle?<\/h2>\n

Here is a simple trigonometric formula to calculate beam angle (beam spread).<\/p>\n

Angle = 2* Tan-1 [Beam Spread \/ Light Distance]<\/strong><\/p>\n

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Beam spread here is 50% of the total light output; any light outside the concentrated center is called “spill light” or “beam field.”<\/p>\n

The beam angle of a bulb is calculated using precise instruments in a controlled environment. The average consumer does not need to calculate the angle; they can check the bulb’s packaging or the manufacturer’s website. This section is only for informational purposes to help you better understand the correct beam angle.<\/p>\n

Beam Angle Selection Criteria<\/h2>\n

Now that you understand the importance of beams and the difference between narrow and wide beam angles, we can move on to selection criteria. To choose the best beam angle for your building, consider five factors.<\/p>\n

1. Building Type<\/h3>\n

There are two key building types when considering beam angle:<\/p>\n