Compared with traditional high-pressure sodium lamps, LED lamps are energy-saving and environmentally friendly, with lower cost, and they also have obvious advantages in luminous efficiency and lighting effects, so it is not surprising that they have become standard accessories for solar street lamps, but they are not casual. An LED light source can meet our lighting requirements.
Some accessories in detail should also be carefully considered when purchasing, such as the LED lens that affects the efficiency of light use and luminous efficiency. In terms of materials, there are three types of PMMA lens, PC lens and glass lens, then Which lens is the most suitable?
1. PMMA lens
Optical grade PMMA, also known as acrylic material, is a kind of plastic material, which is easy to process. It is usually completed by injection molding or extrusion, with high production efficiency and convenient design. It is colorless and transparent. Good light transmittance, 3mm thickness can reach about 93%, and some high-grade imported materials can reach 95%, so that the LED light source shows good luminous efficiency.
In addition, this material also has excellent weather resistance, the performance will not change in harsh environments for a long time, and the anti-aging performance is good, but it should be noted that this material has poor heat resistance and thermal deformation. The temperature is 92 ℃, which is used more in indoor LED lamps, and it is used less in outdoor LED solar street lamps.
2. PC lens
The PC lens of the solar street light is also a plastic material. Like the PMMA lens, the production efficiency is also very high. It can be injection molded or extruded according to different needs. The physical properties are extremely excellent, and it has good impact resistance. 3kg/cm, which is 8 times that of PMMA, and 200 times that of ordinary glass.
The material itself is unnatural and self-extinguishing, showing a higher safety index, and excellent heat resistance and cold resistance. In the range of -30 ° C ~ 120 ° C, the product will not deform, and in terms of sound insulation and heat insulation The performance will not disappoint.
However, the weather resistance of this material itself is not as good as that of PMMA material. It is usually necessary to add UV agents on the surface to enhance its performance, which can absorb ultraviolet rays and convert visible light, and will not change color after being used outdoors for many years; One point, the transmittance at 3,mm thickness is about 89%.
3. Glass lens
The glass lens of the LED solar lamp is uniform in texture and colorless. The most notable feature is its high light transmittance. Under the condition of first communication, the light transmittance can reach 97% when the thickness is 3mm, the light loss is small, and the light range It is also obviously more excellent, and it has high hardness, high temperature resistance, and good weather resistance.
But at the same time, the shortcomings of glass are also relatively obvious. It is much more brittle, and it is easy to be broken by impact force. The material is much more troublesome in production than the above plastic materials, and mass production is actually not easy to achieve.
To sum up, it is best to choose PC lens for solar street light LED lamps. Although it is slightly less than the other two in terms of light transmittance, it is sufficient for outdoor lighting, whether in terms of physical properties or chemical properties. On the other hand, they all performed better.
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