At present, there are many products of LED lights in different forms. The following is a brief introduction of various products.
(1) LED lamp cup
LED lamp cups are mainly used to replace light sources such as PAR lamps and energy-saving lamps used in downlight lighting. There are currently two main combinations. One type adopts low-power LED arrangement, usually with low power, low luminous flux, and low cost. The other adopts high-power LED arrangement, whose luminous flux can meet the requirements of actual use, but heat dissipation needs special attention. Usually aluminum metal material is used. To manufacture the heat dissipation structure. Figure 1 lists the typical structure of the two combinations.
In order to better meet the requirements of lighting use, usually high-power LED lamp cups also need to be optically designed, and each LED can be independently optically designed [as shown in Figure 2(a)], or overall optical Design [as shown in Figure 2(b)].
Due to the different design methods of LED lamp cups, the product forms are relatively diverse, and it is impossible to list them one by one.
The driving voltage of the LED lamp cup should be paid attention to when using it. At present, many products can be directly connected to the mains.
(2) LED bulb
LED bulbs (Figure 3) are mainly used to replace incandescent lamps and energy-saving lamps. The LED bulbs currently used in lighting are made of high-power LED chips. In order to prevent glare, the shell is usually made of frosted glass or acrylic. Similar to the LED lamp cup, most of the heat dissipation currently adopts an aluminum heat dissipation structure. LED bulbs can be directly driven by the city electricity, most of the products have a wide voltage input, which can be input from 90V to 260V.
(3) LED fluorescent tube
There are two main methods for LED fluorescent tubes (Figure 4). One uses low-power devices, which uses more LED particles and lower cost, but the overall illuminance level is lower. The other uses SMD power devices. The LED particles are small and the illuminance level is high, but the requirements for optical design are very high, otherwise the light distribution control is poor, and the glare problem is serious.
(4) LED flood light
With its light structure, LED floodlights have greater application prospects in landscape lighting. There are currently two types of products, one uses a combination of power chips [as shown in Figure 5(a)], and the other directly uses a single high-power chip [as shown in Figure 5(b)]. The performance of the former is relatively stable. , The single high-power product has a relatively large structure and is suitable for small-scale light projection. The latter can reach high power and can be used for long-distance large-area light projection, but it is difficult to dissipate heat.
(5) LED street lights
There are two types of LED road lights in Figure 6, one is using a combination of power chips, and the other is directly using a single high-power chip. There are two driving voltages for LED street lights, one is 12V/24V low voltage, mainly for solar lighting, and the other is grid voltage for direct power supply. At present, low-power LED solar street lights are the focus of their use. With the breakthrough of LED technology and lighting technology, LED street lights will gradually develop to high-level road lighting. At present, the technology of LED street lights is still maturing, the main problem is that the light distribution can not well meet the requirements of road lighting. The current light distribution method of LED street lights mainly adopts the method of LED direction fixation and lens light splitting, which requires high precision in design and production.
(6) LED tunnel lights
LED tunnel light Figure 7 has two types of products, one uses a combination of power chips, and the other directly uses a single high-power chip. The biggest feature of LED tunnel lights is that they can easily realize dimming control, combined with the characteristics and requirements of tunnel lighting, can save energy to the greatest extent. LED tunnel lights are currently unable to provide sufficient brightness for the entrance lighting, and are mainly used in the middle section of the tunnel lighting.