First, the high and low frequency of the electrodeless lamp
Any illuminating lamp without a filament electrode is an electrodeless lamp. In fact, the microwave lamp is also in the category of an electrodeless lamp. There is no filament electrode inside the microwave lamp, it is a 2450MHz microwave to stimulate the sulfur inside the bulb body. Sulfur is directly excited to emit very strong white visible light after microwave excitation. Sulfur does not pollute human living environment, so microwave lamps are not only mercury pollution, but also no UV pollution and phosphor pollution of phosphors. It is a true green light source. At the same time, the spectrum of the light of the microwave sulfur lamp is very close to the spectrum of sunlight, and it is the most similar daylight illumination. This kind of lighting with true sunlight is a cornucopia cash cow for planting farming. The removal of filaments from lighting is a major advancement in lighting technology and certainly the direction of human lighting. The lamp without the electrode does not have the loss of the filament. The life of the filament is naturally prolonged. At the same time, there is no ablation of the sputtered filament residue to contaminate the phosphor, which seriously affects the luminous ability of the phosphor to cause the light decay of the energy-saving lamp. This is the induction lamp ratio. One of the reasons for the decline in energy-saving lighting. Why is there a debate about the high and low frequencies of the electrodeless lamp? Where is the development of the electrodeless lamp? Is it the direction and not the detour? The high and low frequency of the electrodeless lamp is judged from their working frequency. The operating frequency of the high-frequency electrodeless lamp is 2650KHz, and the working frequency of the low-frequency electrodeless lamp is between 150K and 300KHz, and more 230KHz is selected. The reason for the high and low frequency difference is very simple: the 2650KHz high frequency electrodeless lamp has great technical difficulty, and there are more difficulties in design and production. The use of 150K ~ 350KHz low-frequency electrodeless lamps is relatively easy in technology, and there are ready-made 150K ~ 350KHz power supply circuit chips can be used. So what are the technical difficulties that are difficult to solve in high-frequency induction lamps?
Second, the technical dilemma of high frequency electrodeless lamps
1. The luminous efficacy of high-frequency electrodeless lamps is too low, generally within 70LM/W. As far as I know, the efficacy of high-frequency electrodeless lamps has not exceeded 72LM/W. Even when it reaches 72 LM/W or more, this light effect is also peculiarly low compared to sodium lamps and metal halide lamps, and is far lower than some high-efficiency fluorescent lamps with filaments.
2, high-frequency electrodeless lamp because the temperature inside the cavity is very high, its heat dissipation is not easy to solve, the power does not dare to do too much, generally does not exceed 165W. There is a claim to make 200W, but the luminous flux of it has not been increased by physical testing, and it has no practical significance. In this way, the power of the high-frequency electrodeless lamp is too small, and the luminous flux is not high, and it is not suitable for use in many occasions, so its application range is limited.
3. The EMC index of high-frequency electrodeless lamps is difficult to reach the standard. There are two transmission paths for electromagnetic interference: one is radiation and the other is conduction. The question is how can these two transmission channels completely block it and make the leakage of electromagnetic waves smaller to meet the increasingly strict EMC index? ?
4, the life of high-frequency electrodeless lamps, especially the long-term gap between the life of the high-frequency power supply and the propaganda is too large, it is impossible to reach 60,000 hours of service life. Can it be achieved in 20,000 hours? I see it hard.
5, the cost of high-frequency electrodeless lamps is still relatively high, and the external form is small. In particular, it is very demanding on the installation of the street lamp, and the heat dissipation capability of the casing is extremely high. Otherwise, the electrodeless lamp cannot work normally for a long time. In essence, the heat of the high-frequency electrodeless lamp is quite powerful.
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