I was depressed when I bought a Zhongshan LED fluorescent tube
This is a true story
One day, QQ message sent a message about cheap LED fluorescent lamps. The price was very low. Out of curiosity, I decided to buy one and have a look. What kind of lamp is it? After some inquiries, we sell finished products and spare parts, the price is not more than 20 yuan
It cost 30 yuan to send express. It can be seen from the express note that the piece was sent from Zhongshan.
Start to power on, first test the electrical parameters: voltage is 220v, power is 18w, PF=0.56, current is 146ma, energy saving effect is not good
Test luminous flux; about 1220
It happened to be on for a while, but not for a while. To reflect the truth to the supplier, he said it was impossible, only to see it for himself.
So I started to repair it myself to see if it could be done well. Disassemble the LED fluorescent lamp and check that the plug is snapped and opened immediately. Look at the internal structure:
1. The power supply is very small. It is wrapped in ordinary insulating paper. There is a small IC that is actually bonded. The structure is simple, similar to the resistance-capacitance power supply. It is found that there is a virtual soldering.
2. Aluminum substrate: 2835 lamp beads, 88 pieces, 44 strings * 2 parallel. Output voltage up to 138v
3. PC cover: very thin
After repairing the LED fluorescent tube, I want to light it for a long time to see how the luminous decay is?
Put it into the bracket and test the illuminance of 351lux by the way
On the first day, the light is normal
The next day, it was normal in the morning, but the brightness was suddenly dimmed at noon, and it replied after a while. Repeated 3 times in a row. Suddenly the left side dimmed and flashed, and the entire LED fluorescent lamp went out and never turned on again. Tell the seller the situation and leave a message on QQ, but there is no response. The author is very depressed.
There are many LED fluorescent lamps like this on the market. In order to reduce costs, there are endless troubles. Try to reduce costs as much as possible, resulting in poor security. Output 138v, which is very dangerous. Reduce the LED lamp beads, use the power of the lamp beads to the limit, and shorten the life of the led. The power supply is extremely simple, making the LED fluorescent lamp unreliable. The so-called 2-year warranty is a lie and lies. "Cheap is not good" is the truth. Consumers enlarge their eyes, learn more about led tube knowledge, and choose a good tube.
