In many lighting fields, the use of narrow-angle lenses is always an indispensable optical element. This article will talk about narrow-angle lenses and how to choose the narrow-angle lenses that are suitable for you.
Narrow-angle lenses refer to lenses that can converge light into a narrow beam, usually precision lenses with a beam angle of ≤30°. Such lenses usually have high directivity and high focusing beam angles.
Basic principles
1. Refraction of light
When light passes through a lens, it refracts due to the different refractive indices of the lens materials. Narrow-angle lenses are generally designed as TIR structures, which can direct 100% of the LED side light (usually 30-40% of the luminous flux) to the target area
2. Focusing ability
Narrow-angle lenses can focus light to a smaller point. This is because their design allows light to converge more effectively when passing through the lens, thereby improving the brightness and clarity of the lighting.
3. Beam divergence control
Narrow-angle lenses can more accurately and effectively control the divergence angle of the beam, prevent excessive diffusion of light, and ensure that the light is evenly distributed in a specific area.
Application of narrow-angle lenses in LED lighting
Because the beam angle of narrow-angle lenses is generally less than 30°, they have high directivity and high focusing beam angle, so they have great advantages in precise light control and key lighting. Can be used in the following application scenarios
1. Spotlight
In commercial lighting, spotlights often use small-angle lenses to provide high-brightness and directional lighting, which is suitable for key lighting in stores, galleries and museums, such as product an-series-10mm; 45mm RGBW lens with Narrow beam 5° for color mixing lighting is suitable for spotlights for stage lighting and display lighting;
2. Outdoor lighting
Small-angle lenses are used in LED street lights to effectively control the divergence angle of the beam, ensure uniform road lighting and avoid light pollution, such as 2x2 7degree Narrow Beam、2x6-arrays-8-degree、4x4-lens-16-leds.
3. Medical surgical lights
Precision narrow-angle lenses are key components of modern surgical lighting systems. To ensure compliance with the IEC standard for surgical lighting and provide high cd/lm values, I recommend a 5° small-angle 37.8mm surgical light lens, which complies with the IEC 60601-2-41 surgical lighting standard. It's a good choice!
How to choose a suitable narrow-angle lens?
First, you need to clarify the application needs and determine the specific application requirements, such as indoor lighting or outdoor lighting; secondly, consider the installation space to determine the size of the lens; then determine the material used for the lens (PC/PMMA/glass); compatible LED types and specific beam angles (<15° or between 15-30°). This is the most convenient and quickest way to find a narrow-angle lens suitable for your lighting project
If you are looking for optical devices for dense beam applications, please contact Asahi to obtain the latest product brochures and quotes