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What are the advantages and classifications of LED lamps

Update:25 Aug
Nowadays, LED lamps are accepted and used by more and more people. They are not new lighting lamps, and they are quite different from traditional lamps. Let's take a look at the main advantages of LED lamps:
(1) Energy saving. The energy consumption of white LEDs is only 1/10 of incandescent lamps and 1/4 of energy-saving lamps;
(2) Longevity. The actual life can reach more than 50,000 hours, which is several times or even dozens of times that of ordinary light sources;
(3) High purity, bright and rich colors. Current LED products cover almost the entire visible spectrum with high color purity. ;
(4) Solid luminescence, good seismic performance, firm and reliable;
(5) Dynamic color control, adjustable light and shade, the combination of three primary colors of LEDs can use PWM to achieve color changes;
(6) LED has strong luminous directionality, high luminous flux utilization rate, and small size, which is easy to control the appearance design and light intensity distribution of LED lamps;
(7) LED can be powered by DC low voltage, which is safe and reliable;
(8) The luminous efficiency of LED lamps is high, and the white LEDs currently used in mass production can achieve a maximum of 150lm/W;
(9) Green lighting, free of harmful substances such as mercury, etc.
Although LED lamps have many advantages, traditional lamps have not been completely replaced by them due to the disadvantages of high cost, low luminous efficiency of high-power LEDs, and large heat generation. The price of a set of LED lamps is ten times or even dozens of times that of a set of energy-saving lamps. The luminous efficiency of high-power LEDs above 3W is lower than that of high-pressure sodium lamps, etc., and the energy saving of LEDs can only be compared to lamps within 50W. And it is far inferior to high-pressure sodium lamps in high-brightness lighting above 50W. In addition, especially for high-power lamps, the large heat generation leads to stricter requirements on heat dissipation components for LED lamps, which increases the volume of LED lamps accordingly. Reduces the dexterity of high-power lamps.
There are various classification forms of LED lamps. Let's talk about the three more common classification methods first. First, it is classified according to the type of protection against electric shock, which can be divided into Class 0 lamps, Class I lamps, Class II lamps, and Class III lamps.
Class 0 lamps mainly rely on basic insulation as protection against electric shock. When the basic insulation fails, the protection against electric shock can only rely on the environment. The protection against the electric shock of Class I lamps not only relies on basic insulation but also includes additional safety measures, that is, connecting accessible conductive parts to the protective earth conductor in the fixed line, so that the accessible conductive parts can be Not live (ie equivalent to Class 0 lamps + ground). On the basis of relying on basic insulation, Class II lamps also have additional safety measures, such as double insulation or reinforced insulation, but there are no measures for protective grounding or installation conditions. The power supply used by Class III lamps is safety extra-low voltage, and no voltage higher than SELV (safety extra-low voltage standard) is generated inside the lamp.
Second, according to the power of the light source, it can be divided into low-power lamps and high-power lamps. Low-power lamps generally refer to lamps with light source power less than 0.5W/piece; high-power lamps generally refer to lamps with light source power greater than 0.5W/piece. The last one is according to the application method of lamps, which can be divided into ceiling lamps, down lamps, flat lamps, chandeliers, fluorescent lamps, wall lamps, spot lamps, lamp cups, bulbs, track lamps, contour lamps, and flood lamps (also known as Wall washer lights), point light sources, buried lights, underwater lights, garden lights (including street lights), etc.

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