LED is a light-emitting diode, which is a type of diode, which is characterized by emitting light of different colors when the current is forwarded. High power LED is also a kind of LED. Compared with low-power LED, high power LED single power high power LED lamp is a kind of LED lamp with relatively large power, which is generally composed of multiple small LED lamps. , The higher the power of a single LED, the higher the price. Basically, high power LEDs with a rated current of more than 20mA are used, and low-power LEDs are all 20mA. The single brightness of LED is lm (lumens), and the unit of lumens is cd. The production of high power LEDs has expanded the use of LEDs, so that LED lights can be used in more places, such as street lights, car lights, and plant lights.
Classification of high power LED light
High power LED light can be classified according to their parameters. Different reference standards will result in different classifications. Other classifications will not be repeated here. High power LED is an important LED product, and it is an important part of letting LED lighting enter the market and move towards general lighting.
The reason why LED high power is called this is mainly for low-power LEDs. I have summarized three current classification standards:
The first one is according to the power level, it can be divided into 0.5W, 1W, 3W, 5W, 10W…100W, which varies according to the total power of the molded product after packaging.
The second type can be divided into different packaging processes: large-size epoxy resin packaging, piranha-like epoxy resin packaging, aluminum substrate (MCPCB) packaging, TO packaging, power SMD packaging, MCPCB integrated packaging, etc.
The third type can be divided into low-light-attenuation high power products and non-low-light-attenuation high power products according to the degree of light attenuation.
Advantages and disadvantages of design and manufacture of high power LED lights
High power LED is one of the most important means to achieve high luminous flux. There are many advantages and disadvantages of high power LED light. How to make use of its advantages and avoid its disadvantages is the key.
The comparison of high power and standard power LED products has the following advantages:
- Simplify the design process
Due to the need to consider greatly simplifying thermal management, the design process required for standard LED arrays is much simpler than the design process required for high power technology. In our theoretical example, driving a 1W LED requires 350mA current, while six standards LED arrays only require 120mA current. High power technology requires the use of heat sinks and metal core PCB boards to ensure that no efficiency loss, reduced service life, or discoloration caused by excessively high junction temperature is avoided. Standard LEDs require relatively fewer electronic parts than ordinary LEDs, especially resistors, capacitors, heat sinks, and metal core printed circuit boards (MCPCB). The standard LED production process has also been streamlined, so relatively speaking standard LEDs The design, testing, and manufacturing of the product are simpler. The production process is simplified, time and cost are saved, and the time to market the product can be better grasped.
- Cost saving
High power LEDs require thermal management, which greatly increases the cost of LEDs. In the design process, the most expensive addition is the heat sink. Heat sinks are generally made of metal materials with high thermal conductivity. These materials can be relatively inexpensive aluminum, or gold, silver, copper, and other metals with better thermal conductivity and more expensive prices. These expensive materials may cause the cost of high power products to increase by 1 to 10 dollars, and standard LED devices can avoid this cost increase.
Heat dissipation is an important indicator of high power LED light, and the design and manufacture of high power LEDs will not skimp on the cost of this piece. The manufacture of high power LED light uses MCPCB, and MCPCB uses metal materials with good thermal conductivity. Standard LEDs do not require high thermal conductivity and use relatively inexpensive FR4 PCBs, which have much lower heat dissipation capabilities. The cost of MCPCB is high, and its price is 5 times that of FR4 PCB. If the heat dissipation requirements are not high, using standard LED production technology and using FR4 PCB can save 60% of the cost.
- Save space
When the internal space of the equipment is very limited, standard LEDs are usually the best choice. As mentioned above, high power LEDs require additional use of heat sinks and overall cooling technology that takes up more space. The first thing to do is to increase the heat dissipation area, which can dissipate heat through air convection and thermal radiation. The large heat dissipation area can effectively reduce the accumulation of heat, and the volume will increase as the area increases, which increases the design difficulty.
Standard LED arrays usually do not require space-consuming drivers, capacitors, and resistors (these are all required for high power LEDs), thus saving up to 50% of the space. The space utilization of standard LEDs is higher than that of high power space. When the same brightness is provided, the space used by standard LEDs will be much smaller.
Disadvantages:
Because the conversion efficiency of high power white LEDs is still low, the luminous flux is small, the cost is high, the white light is used for a long time, it is easy to change color, and heat dissipation, and other factors. Work lamps, the medium and long-term goal can be the general lighting field.
The development history and application potential of LEDs Since its inception, the “Haitz” law that has increased its brightness by 30 times and the price by 10 times every 10 years has developed rapidly. Ordinary high-brightness white LEDs have reached the level of 100 lm/W in the laboratory, and 50 lm/W high-power white LEDs have also entered commercialization. In terms of monochromatic light, the luminous effects of red, yellow, blue, and green light have also been constantly refreshed. LEDs have become more widely used as new light sources, and have gradually attracted more people’s attention and expectations.
At present, LED applications are diversified in various industries, including indication, display, backlight, lighting, etc. Lighting is the industry with the most potential in many LED applications. With the continuous improvement of LED light efficiency and the continuous reduction of costs, its market share in the entire lighting field will also increase.
By then, the annual energy savings of semiconductor lighting will exceed the annual power generation capacity of the “Big Mac”-the Three Gorges Power Station! In the context of increasing energy shortages, using the energy-saving features of LEDs to develop LED lighting is a positive response to the government’s proposal to build a conservation-oriented society.
Advantages of using high power LED light
High-power LED characteristics and comparison with other light sources. LEDs are well-known as “green light sources”. In the lighting industry, comparing and analyzing it with traditional light sources, some aspects show advantages that are difficult to replace: LED as a light source for lighting has the following advantages:
- Low power consumption: LED lamps that produce the same lumen consume less power than other lamps. For example, LED lamps with a light efficiency of 75lm/W reduce power consumption by about 80% than incandescent lamps.
- Long life: The life of LED products is much longer than other lamps. The life of normal LED lamps is more than 50,000 hours.
- the dynamic control of brightness and color is easy: the brightness can be continuously adjusted, the color purity is high, and the color dynamic change and digital control can be realized;
- Variety of shapes: large LED lights are composed of small LED lights, and LED lights of different shapes and sizes can be produced according to requirements.
- Environmental protection: no harmful metal mercury, no infrared and ultraviolet radiation;
- Environmental protection: The production materials of LED lights are all pollution-free environmental protection materials, and normal LED lights will not produce infrared and ultraviolet rays.
- Color: bright, saturated, pure, no filter is needed, red, green, and blue can be adjusted into a variety of different colors, which can achieve changeable, progressive, and mixed light effects, with excellent color rendering effects. The combination of so many advantages makes us feel that vigorously promoting the use of LED is a very valuable work.
Summary
The use of high power LED light has promoted the development of LED lights and brought LED lights into people’s daily lives. However, high-power LED lights also have some technical bottlenecks that need to be broken through. Although the color rendering of LED lights is high, RA has reached 80, but there is still a big gap from natural light. The heat dissipation of high-power LED lights needs to be further improved, and this performance can affect the life and light attenuation of the LED lights. The luminous efficiency of the LED lamp is still far from the theoretical value, and the heat generation is still relatively large. Although LED lights are still a long way from being perfect, the overall performance of LED lights is already the best on the market. Material technology and production processes are still in technological development, and our pursuit of higher-quality lighting is also progressing. Excellent LED light companies such as MOKOlight are also continuing to work hard.
