Led Lens

           LED lens is an optical system closely related to LED that helps to improve the light efficiency of LED and change the light field distribution of LED. Other types of lenses such as: lenses for cameras, telescopes, etc., do not belong to the  of this article, this article focuses on secondary concentrating lenses for high-power leds.The material type of LED lens:
                       

                 1.  Silicone lens a. Because of the high temperature resistance of silicone (it can also be over-reflow), it is commonly packaged directly on the LED chip. b. The general silica gel lens has a small volume and a diameter of 3-10mm.
               

                2.  PMMA lens a. Optical grade PMMA(polymethyl methacrylate, commonly known as: acrylic). b. Plastic materials, advantages: high production efficiency (can be completed by injection molding, extrusion); High light transmittance (about 93% at 3mm thickness); Disadvantages: The temperature cannot exceed 80°(thermal deformation temperature 92 °).
                 

                3.  PC lens a. Optical grade Polycarbonate(PC) polycarbonate. b. Plastic materials, advantages: high production efficiency (can be completed by injection molding, extrusion); Slightly lower light  transmittance (about 89% penetration at 3mm thickness): Disadvantages: the temperature cannot exceed 110(thermal deformation temperature 135 degrees).
                   

               4.  Glass lens optical glass material, advantages: with high light transmittance (97%), high temperature resistance; Disadvantages: large volume, heavy weight, single shape, fragile, mass production is not easy to achieve, low production efficiency, high cost. However, the current price of such production equipment is high, and it is difficult to popularize in the short term. Additional glass ratio PMMA, PC material fragile shortcomings, but also need more research and exploration, now can be achieved to improve the process, only through coating or tempering treatment to improve the non- breakable characteristics of the glass, although after these treatments, the light transmittance of the glass lens will be reduced, but it will still be far greater than ordinary optical plastic The light transmission effect of the material lens. So the prospect of glass lenses will be broader.

              Primary lens: Primary lens: is directly packaged (or bonded) on the LED chip holder, and the LED becomes a whole. B.ed chip (chip) theoretical light is 360 degrees, but in fact the chip is placed on the LED bracket to   be fixed and packaged, so the maximum light Angle of the chip is 180 degrees (greater than 180 range also has a small amount of peripheral light)The external chip will also have some stray light, so that   through a lens can effectively converge all the light of the chip and can get different light angles such as 180, 160°, 140°, 120°, 90°, 60°, but different light Angle LED light efficiency has a certain 
                difference. Primary lens is generally used PMMA, PC, optical glass, silicone and other materials. Secondary lens: Secondary lens and LED are two independent objects, but they are inseparable when applied. The function of the secondary lens is to converge the light Angle of the LED light source again into any desired Angle between 5 and 160, and the distribution of the light field can be mainly divided into: round, oval, rectangular. Secondary lens material one Use optically grade PMMA or PC; Glass can be selected in special cases.

From the above LED lens design and production process point of view, seemingly simple LED lens, from the design to the finished product, its requirements for software and hardware are very high, which also caused the price difference of LED lens on the market. From the perspective of the popularity of LED lighting, the lens as a necessary part of LED lighting, the market prospects will be more and more
Yes.