Relay vs christmas lights

[TomGeorge]

Hi,

@geppox

Someone in the thread tol me to test a bulb light in parallel with the led strip (therefore on a single output): in this case both lamp and led stripe are off when the relay is open and light on when the relay is closed.

So your problem is identified, leakage through the Triac in the SSR.
In the open position, the lamp resistance is very low and so the majority of the leakage current flows through the lamp and not the higher resistance of the LED strip.

The 1.5mA leakage is not enough to light the lamp.

Tom...