@Solla-topee With all due respect, telling a consumer to look for or change a compatible light fixture is not an appropriate solution or suggestion. TP-Link needs to be transparent about this...

I ended up finding the answer myself. Apparently, TP-Link neglected to make this clear on this HS220, but this only works with a single light bulb. I came across Amazon reviews sharing this after...

I had HS200 installed on this very light switch, and I loved it. It's a dining room light witha ceiling fan with 4 lightbulb sockets. Because I wanted to save on electricity, I replaced my HS200 with...