Zigbee, ZWave repeater

It depends on the type of switch. Most smart bulbs do not recommend using them with a switch that cuts all power to the bulb. This can shorten the bulb life significantly. These bulbs are intended to be kept always on power even when they are “off”.

As long as a bulb is drawing power, even if it looks like it is off, it will still act as a repeater if it is capable of doing so. If you cut the power completely, it cannot repeat.

For discussion of the best switches to use with smart bulbs, see the following: