Lay the lights in the box where you want them to test for fit. Once you've got the lights where you want them, mark the spots on the speaker box. Cut the end of the wire for the LED lights and ...

To demonstrate, Miller points to a set of LED holiday lights that claim on the box to be flicker free. They are 120 Hertz, so their flicker isn't easily visible by just looking directly at them.

The WiZ HDMI sync box can make your WiZ lights dance with movies and music. Image: Signify Jennifer Pattison Tuohy is a smart home reporter who’s been testing connected gadgets since 2013.