Unfortunately, It’s unlikely that that setup will work reliably.
if the Hue bulbs are connected via a Hue Bridge (the only officially recommended method), then they form their own mini network and are not visible to your other zigbee devices
Yes. The only officially recommended way to use Hue devices with SmartThings is by using a Hue bridge.
There are several reasons to use the bridge.
Other Integrations
There will be a number of other integrations available to you which you may want to take advantage of.
Use of Hue Scenes
you will be able to activate scenes created with the official Hue app, which at the present time offer many features not available in the smartthings scenes feature. Even just the ability to blink the lights. The easiest way to access scenes from the Hue app is through the following custom edge driver or IFTTT, but there are other ways as well.
[ST Edge] Philips Hue LAN [BETA] (3rd Party Driver, Not ST Native)
Not using the Bridge can mess up your zigbee network
the most important really is …
if the Hue bulbs are connected without a Hue bridge, they are unreliable repeaters.
Hue Bridge
Lightbulbs connected to a hue bridge are repeaters–but only for other devices attached to the same bridge. They essentially form their own mini network. So they won’t help with nearby sensors.
Zwave bulbs
Zwave lightbulbs like those from Linear and aeotec typically are repeaters – – but only for Z wave. These can actually be very useful in some specific use cases like getting zwave signal down basement stairs or across a garage.