Securing IoT-Devices by moving to guest if?

Hi,

I have integrated several LifX-bulbs into my home network.
I used to have them connected to lan if via a separated wifi SSID - reason I did this is the controlling devices (several smartphones), that are connected to the lan if, need to acces the bulbs.
Now I am thinking about moving the bulbs to guest network - is it feasible to have the smartphones within lan if controlling the bulbs within guest if? If yes, how could that be achieved?

Best,
ssdnvv