1. The wiring of the bulb switch is wrong, and the zero line is connected to the switch, resulting in that the live wire is still connected to the bulb after the lights are turned off, causing the bulb to be slightly bright.

2. The neutral line is charged, and the neutral line current is too large, which will cause the light bulb to be slightly bright after turning off the lights.

3. There is an indicator light inside the switch, and there is still a weak current after turning off the lights, which causes the light bulb to be slightly brighter after turning off the lights.

4. The light source patch of the light bulb is of poor quality, resulting in light leakage, which leads to the light bulb being slightly brighter after turning off the lights.

Second, the light bulb purchase precautions

1, when buying a light bulb, pay attention to the size of the area and the floor to avoid the light bulb brightness is not enough because of the large area.

2. There are many kinds of light bulbs on the market at present, and the wattage determines the power of the light bulbs. The greater the wattage, the higher the brightness and the greater the power consumption, so you can choose according to the size of the space when purchasing.

3, pay attention to the size of the lamp cap of the light bulb, so be sure to determine the size of the lamp cap before buying, so as not to use it after buying it, which will be more troublesome.

Pay attention to the lumen number of the light bulb when buying it. The higher the luminosity, the stronger the light source.

The light bulb is slightly brighter after turning off the lights for the above reasons. I hope it helps after reading it.