1. Knowledge about LED Lens
LED lens are closely linked together with LED
LED lens generally are silicone lens, because silicone is resistant to high temperature (can
lead reflow), which is commonly encapsulated directly on the LED chip. Generally the
silicone lens are smaller, the diameter is 3-10mm. And generally led lens are closely linked
together with LED, which helps to enhance the light efficiency of the LED, and the lens
change the optical system of LED light field distribution.
Classification of LED lens
1. Silicone lens
a. Silicone is heat resistant (can lead reflow), so it is often used directly to encapsulate LED
devices.
b. Generally silicone lens is smaller, which is 3-10mm in diameter.
2PMMA lens
a. Optical grade PMMA (poly methyl methacrylate, commonly known as: Acrylic)
b. Plastic materials, advantages: high efficiency (completed by injection molding, extrusion);
high transmittance (93% penetration at 3 mm thickness); drawback: the temperature should
not exceed 80 ° (heat distortion temperature is 92 degrees).
3PC lens
a. Optical grade material Polycarbonate (referred to as PC)polycarbonate
b. Plastic materialadvantages: high efficiency (completed by injection molding, extrusion); the
transmittance slightly lower (transmittance is about 89% at 3 mm thickness); drawback: the
temperature must not exceed 110 ° (heat distortion temperature is 135 degrees).
4Glass lens
Optical glass material, advantages: rich optical parameters features (optional), high
transmittance (97% transmittance at 3 mm thickness), temperature resistant characteristics;
Disadvantages: bulky mass, single shape, fragile, mass production is difficult to achieve, low
production efficiency and high cost. However, the price of such production equipment is high,
which is difficult to spread in the short term. So most led lens manufacturer would prefer
glass lens. In addition, the shortcomings of glass being more fragile than PMMA PC material
need more research and exploration. Only through the improvement process can now be
achieved, non-friable characteristics can be enhanced by glass coated steel processing,
though these treatments transmittance of the glass lens will decrease, which will still be far
greater than the light transmittance effect of the ordinary optical plastic lens. So the prospect
of the glass lens will be broader
Advantages of LED Lens:

2. 1. Regardless of distance, lampshade (reflector cup) is not much different from the lens; in
terms of uniformity, the lens will be better than the reflector cup;
2. LED lens with a small angle is better than the lampshade, which will shot further. The
lampshade condenser goes through the lens (LED itself will have lens) and then after a time
mask condenser lens, this will waste a lot of light, not as good as condenser at the lens, light-
emitting angle lens is a good deal!
3. In contrast, the lampshade light-emitting uniform point range is wide, but voted luminosity
is bad, the opposite for lens.
4. LED lens seem to be more upscale.
This article is come from:
http://www.chinaphoneparts.com/index.php/knowledge-about-led-lens.htm