LED lenses are used to adjust the LED light for ease of use. Since the light emitted by the LED has high straightness but does not spread, it is diffused by passing through the LED lens to suit each application for lighting. The shape of the lens varies depending on the application and the number of light sources.
Lighting using LEDs as a light source is being introduced in many places other than home use. It is incorporated into the equipment together with the LED lens to support a wide range of applications.
Usage of LED lens
LED lenses are often built into luminaires that use LED light sources. Due to its excellent cost performance, LED lighting is becoming popular in a wide range of locations such as store lighting, residential lighting, advertising lighting, street lighting, stage lighting, outdoor lighting, flash lamps and measuring instruments.
In addition to the large number of LED lighting used in hotels, showrooms, and museums, LED lighting and LED lenses suitable for special purposes such as exhibitions have been introduced.
LED lens principle
The LED light has high straightness, and it is difficult to use it as it is because the front of the LED is strong and bright, especially when the LED element is placed on the board. Therefore, we use an LED lens to adjust the light and give it a spread according to the LED.
According to DZOptics, the shape of the LED lens, etc. varies greatly depending on the shape of the LED light source package. Inexpensive flashlights and the like use so-called LED packages of ordinary elements, and have high forward straightness. For lighting LEDs, packages covered with dome-shaped transparent resin are often used, and they have wide directivity. Called the Lambert light distribution, the center is bright and gradually darkens as you move away. The lens shape is designed by simulating the illuminance distribution from the LED light source using the illumination optical design software.
The light that has passed through the LED lens is refracted, condensed or diffused and hits the irradiated surface. Since the impression of light changes greatly depending on the distance from the LED light source, the distance to the LED lens and light source is determined by the desired light distribution.