Heat dissipation
The poor heat resistance of LEDs is well known and will inevitably lead to problems with the life of the wick. The design of existing LED lamps is often difficult to achieve heat dissipation. In a field where heat dissipation is very demanding, it uses very inferior passive heat dissipation methods, and most of them are air-cooled or even closed air-cooled. Like some luminaires, a plastic sleeve is added between the drive plate and the aluminum heat sink to increase the reliability of the insulation. It is also necessary to heat the silicone to improve the heat dissipation capability. The T8 lamp tube is still closed, and the wick can only rely on air convection heat transfer to the aluminum tube on the back of the lamp for heat dissipation. Generally, the internal temperature of such lamps will be seventy to eighty degrees. And if you take into account heat dissipation, weight is a problem; taking into account the weight, heat is difficult to guarantee, which is a dilemma in the existing design, there is no feasible standard.
2. Life expectancy
LED wick life decreases exponentially with increasing temperature; electrolytic capacitor temperature decreases by half for every ten degrees of increase; MOS temperature increases, internal resistance increases, loss increases, temperature increases (constant current mode), and eventually burns out . Of course, the domestic manufacturers did not give the life of the specific LED lamps. The propaganda only mentioned that the LED wicks lasted for 100,000 hours, but the LED life bottleneck was in the system driver board, and the LED wicks were not damaged, and the system driver had been hung up.
In addition, the light decay of the LED is very serious, so the life of the luminaire should also take into account the visual experience, that is, how long after the brightness of the luminaire is reduced to a visually dark degree, it can be considered that the life is up, the customer will consider replacing the luminaire. This life is not given by the manufacturer (or no way to give it), but it is very important.
In addition, the existing LED household lighting is mostly limited by volume, and it is difficult to do very well in terms of protection. In areas with large voltage fluctuations and severe interference, the existing low-power design is a test.
The most important thing is, whether the life of LED is directly proportional to the life of the company. If the LED lamp for 10 years is broken, it will be broken in 2 years. If the company has closed down half a year ago, will the user take this risk?
3. Weight
In the spiral type of luminaire, the weight of the fluorescent lamp is only a fraction of that of the LED luminaire. Since there is no problem with the heat sink, the weight of the fluorescent lamp is negligible for the lamp holder, but the weight of the LED is a serious problem for the lamp holder. The test, especially the 7.8W screw interface LED lamp, its weight is very dangerous, which merchant has considered this?
4. Price
A typical LED driver board can last only 5 years (home) at 70 degrees Celsius, far from the "concept" of LED wicks for 10 years. Therefore, compared with fluorescent lamps of the same brightness, even if the fluorescent lamp has a life of only one year, the 1W1 fluorescent lamp is much more cost-effective than the 1W10 LED. Especially when the LED lamp is damaged, the wick is not broken, but the whole lamp is replaced. One count is because one tenth of the drive board has to discard the remaining nine tenths of the lamp (the wick and the heat sink account for most of the cost of the entire lamp), if every manufacturer does not recycle it. Customers will not like such products.
Although LED lamps have so many shortcomings, LED technology is also constantly improving. I believe that one day LED technology will become more mature, and replace incandescent lamps and fluorescent lamps, and enter our homes!
Water Purifier Pressure Sensor
Shenzhen Ever-smart Sensor Technology Co., LTD , https://www.fluhandy.com