Yes. The only officially recommended way to use Hue devices with SmartThings is by using a Hue bridge.
The following FAQ details five different reasons why using the bridge is better than not using the bridge. Including the fact that you could mess up your zigbee network. (this is a clickable link)
It’s true that if you get some custom code technically you can add a Hue bulb to the SmartThings set up without having a Hue bridge, and there are some members who have done that, but you are opening up a number of potential problems for yourself, including the possibility of lost messages from other devices.
