Fix blinking LEDs with a motion sensor (when off)

Yes, that could be the cause depending on the electronics.

If you want to waste power? The better solution is to use another sensor.

The blinking, however, might also be caused by an induced current within the wiring. I had the case where I had a ceiling LED light would blink randomly when turned off, another one was always slightly on even when the switch was off. This was caused by long adjacent wires within the wall.

The LED were requiring so little power to turn on, that the coupling of the cables within the walls was enough to actually trigger the lamp to turn on. This problem probably does not happens with better quality lamps.

As suggested, try with a higher power lamp, and try with another LED lamp and observe if the behavior is similar.

This is common with sensors that are not listed for use with LED’s The sensor is drawing a tiny amount of power to power the electronics, this s just enough to cause a glow and sometimes flashing. You have 2 options use higher wattage lamps like you have tried to prove the sensor was working OR find an LED compatible sensor. I use motion sensors that work with LED’s you will find many of the led type need a neutral so they power the electronics with out drawing current through the lamps this is causing the flashing.