There is a famous saying: optics is the soul of lamps (not optical is the bullet of LED?). What if a lamp has no soul? Then I have to sell hardware, aluminum plate, lamp housing, LED "breaking jin ~" (Cantonese, meaning by weight).
So the question is, what do we use to shape the soul of LED lamps? LED common optics are lenses and reflectors. What are their advantages and disadvantages? Xiong Da is here with you:
lens
The LED lens is divided into a primary lens and a secondary lens. The "lens" we generally refer to is a secondary lens, that is, a light source such as an LED lamp bead or a COB , and is closely combined with it. Different lenses can be used to achieve the desired optical effect, depending on the requirements.
The main material of the LED lens on the market today is PMMA. It has good plasticity and high light transmittance (up to 93%). The disadvantage is that the temperature resistance is relatively low, only about 90 degrees. The main secondary lens on the market is generally the internal total reflection design (TIR). The design of the lens is transparent in front of the lens, and the tapered surface can collect and reflect the side light. The overlapping of light can achieve perfect light utilization and beautiful spot effect. The TIR lens has an efficiency of more than 90% and is mainly used in small-angle lamps (beam angle <60°), such as spotlights and ceiling lamps.
Figure: LED light passes through the lens path diagram.
Reflective cup
Usually, the LED light source has an illumination angle of about 120°. In order to achieve the desired optical effect, the lamp sometimes uses a reflector to control the illumination distance, the illumination area, and the spot effect.
Figure: The light path of the reflector.
Figure: Reflective cup and main spot, side spot.
Reflective cup material
Metal reflector: It needs to be finished by stamping and polishing process. It has the memory of deformation. It has the advantages of low cost and temperature resistance. It is often used for low-grade lighting requirements.
Plastic Reflector: One-time demoulding, high optical precision, invisible memory, moderate cost, often used in high-temperature lighting requirements for low-temperature lighting. And for export companies, plastic cups are easier to pass the safety regulations, aluminum cups are not easy to pass the safety regulations
The optical effect and application difference between the lens and the reflector:
Figure: The effect of the lens is generally no side spot, the light shape is more beautiful, because the TIR design, the light output efficiency is relatively high. Like the German ERCO, it is more like to use the lens scheme to design the lamps, which can be made smaller!
Figure: Reflective cup application in this case. The effect is pretty! This is not easy to achieve with a lens!
Usually when the TV series is broadcast here, the music rings, and the ultimate problem of good guys and bad guys comes again: Which lens and reflector are better?
This is a mistake that has been wrong. First, you must first understand the requirements. What preconditions do you have and what kind of light effects do you need? Further down, is the realization of such a request, which way is the best solution, sometimes even both, and not only once.
Good optics are good as long as they achieve the desired optical effect. Suitable is the best secondary optics!
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