When the LED ceiling light is turned on first Panasonic and then the fluorescent lamp Junlang with

There are 2 possible causes:

Starting from the working principle of the fluorescent lamp, the starter is an inductive ballast, and the flashing of the starter is actually a repeated on-off circuit, the purpose of which is to make the inductor ballast instantly produce a voltage of more than 600V (self-induced electromotive force), break through the gas discharge between the two ends of the fluorescent lamp, and complete the start of the fluorescent lamp, after the fluorescent lamp is started, because the ballast is connected in series in the fluorescent lamp circuit to divide the voltage, the working voltage of the normal lighting of the fluorescent lamp is about 100V. The starter designed for 220V starter is connected in parallel at both ends of the fluorescent lamp, and the 100V voltage is not enough for the starter to start and keep it quiet. To sum up, since fluorescent lamps are generally not designed to absorb high-voltage pulses, it is inevitable that more than 600V of high voltage will be repeatedly connected to the grid during the start-up stage (of course, the greatest impact on neighboring circuits).

The constant current source (commonly known as the drive) matched with the LED lamp beads, even if the input wide voltage design product (usually marked as 90-260V), the upper limit of the input voltage is 260V, when the power supply voltage is higher (such as the fluorescent lamp start-up stage) or lower than the nominal voltage, the protection circuit cuts off the connection with the power supply, and the voltage returns to the normal range, and the circuit is automatically turned on. If the power supply repeatedly experiences transient high-voltage pulses in a short period of time, the result of the protection circuit is equivalent to the hiccup output of a constant current source. Therefore, when the fluorescent lamp is turned on, there are high-voltage pulses that are repeatedly connected to the power grid for a short time, and the LED lights will also flash.

Personally, I think that I can replace the fluorescent lamp with an electronic ballast (the circuit principle, structure and inductance are different) to eliminate the influence of each other.

The voltage is lower and the light needs to be boosted the moment. It's normal not to worry.

When the fluorescent lamp is turned on, the starter works, causing the voltage fluctuation of the line, so the LED that is turned on first will also flash. At the end of the glow, the fluorescent lamp works normally, the voltage of the line is maintained at a normal level, and the LED does not flash.

It is best to turn on the fluorescent lamp first and then turn on the LED when it is normal. This avoids flickering and also extends the life of the luminaire.