Most led beads are built-in lenses, and very few have no lenses.

       The lens is divided into concave lens, plane lens, convex lens and general lens. The material of the lens is composed of potting glue. A few high power shapes will be added. Lenses are generally made of epoxy resin, silica gel and PC.

       The function of the lens is to help the LED chip spread or gather the light more evenly.

60 degrees and 90 degrees refer to LED lights. Diffusion angle, we usually say that 60 degrees is full angle, while the angle marked in the lamp bead specification is generally half angle, that is, the actual divergence angle of 60 degrees is 60 * 2, that is, 120 degrees, and the divergence angle of 90 degrees is 180 degrees.

      The difference between 60 degrees and 90 degrees is that the light at 60 degrees is more concentrated. The front light intensity is higher and the brightness is higher when viewed by the naked eye. The 90 degree diffusion surface is wider than 60 degrees, the plane angle of view is larger, and the light is brighter. To be soft, relatively speaking, the 90 degree angle light intensity made by the same chip is lower than the 60 degree angle, and the naked eye feels that the brightness is lower, but the actual total luminous flux of the two is the same, that is, the luminous flux is the same, and the small angle light intensity is higher. Low light intensity angle.

     In practical application, taking the display screen as an example, the display screen used on the highway needs a small angle, so that the front light intensity is high and the visible distance is long, while indoor use requires a large viewing angle, wide front light intensity and softer difference. That's the difference.