Question 1

What's 60°, 90°, and 120° beam angle?

Accepted Answer

Beam angles of 60°, 90°, and 120° are among the most common angles; indeed, they were the three primary light distribution types utilized in floodlights in previous years. These angles correspond to a relatively broad illumination coverage and generally fall into the "medium" or "wide" beam angle categories. In addition to these, angles of 15°, 30°, and 45° are also frequently encountered; consulting NEMA beam angle charts reveals that these angles correspond to "narrow" beam angles, which are more typically suited for sports field lighting. In the context of industrial high-bay lights and floodlights, the 60°, 90°, and 120° angles are categorized based on their respective illumination coverage areas. A 60° beam angle produces highly concentrated light; consequently, the light emitted by the fixture forms a relatively small spot on the ground or the illuminated surface, resulting in comparatively high brightness. When applied to industrial lighting, this angle is well-suited for warehouses with high ceilings; however, due to the concentrated nature of the light, the ground surface is prone to exhibiting alternating patches of brightness and shadow—a phenomenon known as uneven illumination. Conversely, a 120° beam angle produces dispersed light, making it suitable for warehouses with lower ceilings. Given its wide beam angle, which results in significant lateral light emission, this configuration is prone to causing glare; therefore, it is not necessarily advisable to install such fixtures at the lowest possible height. The 90° beam angle strikes a balance between the two aforementioned extremes, representing a moderate choice that effectively optimizes both brightness and illumination coverage.

Question 2

What's beam angle and field angle?

Accepted Answer

If you consult the IESNA Handbook, you can find relevant information. On the polar coordinate diagram of the intensity distribution, you can see the beam angle and field angle labeled. The beam angle corresponds to the angle at which the intensity drops from the central peak to 50% (i.e., the half-peak intensity), while the field angle corresponds to the angle at which the intensity drops from the central peak to 10%. The former has a narrower range and is used to determine whether a luminaire is spot or flood, which is the “beam angle” we often refer to. The field angle represents the overall visible spread of light, including the softer outer halo or spill light.

Question 3

What is beam angle chart?

Accepted Answer

The beam angle refers to the range of light emitted by a luminaire, which affects factors such as illuminance, coverage, and glare. NEMA classifies beam angles into seven categories based on their size, known as NEMA types, which correspond to: very narrow, narrow, medium narrow, medium, medium wide, wide, and very wide. When users refer to beam angles using vague terms such as “narrow,” “medium,” or “wide” rather than providing specific angular values, we need to understand the beam angle range the customer prefers in order to select the appropriate lens. The beam angle chart below illustrates the relationship between angular size, NEMA type, and corresponding descriptions.

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LED Street Light

High Mast Light

Led Flood Light

Solar Flood Light

LED High Bay Light

LED Tunnel Light

LED Garden Light

Led Bollard Light

Solar Street Light

LED Traffic Light

LED Canopy Light

Lighting Accessories

Smart Systems

Simulation Design

Smart Financing