What is Beam Angle?

A beam angle – also referred to as a beam spread – is a measurement of how light is distributed. On any plane vertical to a light’s centerline, beam angle is the angle between two light rays with the light intensity equal to 50% of the maximum light intensity. The larger the beam angle, the smaller the central light intensity, and the larger the light spot. In general, a narrow beam is a beam angle of less than 20°; a medium beam is a beam angle of 20° to 40°, and a wide beam greater than 40° (Figure 1.5.1).

Fig. 1.5.1 Narrow beam, medium beam, wide beam

Beam angle lamps of different sizes give off dispersed lighting effects differently. Therefore, what needs to be considered in lighting design is to choose the right beam angle according to specific needs. Lamps with a distinctive beam angle are mostly applied to focused lighting, intended to highlight the focal point, such as decorative paintings, artwork, etc.

Related Articles

Leave a Reply


Hassan Usmani

Yeelight Tech Expert & Blogger

Hassan Usmani is a former smart home enthusiast, keen to study the linkage between optics and smart home. Yeelight is his favorite brand. He has published hundreds of blogs used in optics and smart home.

Why Choose Yeelight?

Yeelight, the best smart lighting brand in the world, has successfully shipped over 50 million products to over 200 countries and regions globally. The brand is widely integrated with major IoT platforms, such as Google Assistant, Amazon Alexa, Samsung SmartThings, Apple HomeKit, Razer Chroma, IFTTT, etc. We endeavor to bring you the best lighting experience you may imagine!