The following is the short FAQ for this topic. It’s very briefly discusses the three most popular options and gives one or two examples of devices for each. At the end of this post is a long FAQ that goes into much more detail.
why you can’t just use a regular switch
You should not use any wall switch that cuts the current to any smart bulb on a regular basis. This is true whether it is a smart switch or a dumb switch.
It’s OK if you just have a power outage once in a while. But if you are using a wall switch to regularly cut the current to a smart bulb, then the “inrush” current that happens every time you turn the switch back on can, over time, damage the radio inside the bulb. This will make the bulbs wear out much sooner. If you read the user guide for your Hue bulbs you will see that they are designed to be on power all of the time.
In addition, there is the problem that every time the power to the bulb is turned off, the bulb cannot hear the next “on” command from the network.
And you definitely don’t want to combine any dimmers that changes current levels to the switch with the smart bulb as you will likely burn out either the bulb or the switch or both. 
So instead, we want to find a switch that can send a instruction directly to the bulb without cutting the power to it. Or a switch that can send an instruction to the SmartThings hub and then the SmartThings hub can send the instruction to the bulb.
That gives you four basic options.
- Smart Switch Cover. This is a battery powered device that fits over the regular switch so you can leave the regular switch on all the time but you will still have buttons on the smartswitch cover that can turn the lights on and off.
At the time of this writing there are two of these that work well with SmartThings: the Nortek/Linear/GoControl zwave smart switch cover and the Sylvania Lightify zigbee version.
https://www.amazon.com/SYLVANIA-Smart-Dimming-Switch-Formerly/dp/B0196M620Y
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In .June 2019, Lutron introduced a new zigbee switch cover for use with the Phillips hue bridge that would be very intuitive for guests. It’s unknown as of the time of this writing if it will work directly with SmartThings as well, but it works very well as a parallel means of control if you have a hue bridge and the bulbs you want to control are connected to that bridge. Like the other two, it is battery operated and fits over the top of the existing switch. No wiring required.
Lutron Aurora dimmer for Hue lights (Z3-1BRL)
- A mains-powered switch which has a zwave radio inside but is not wired to Control the light fixture.. These used to only be found in auxiliary switches, but now there are several models which have a parameter setting to disengage from control of the current so they can work very well for control of smart bulbs also. The switch will send a message to the hub and then the hub will send a message to the bulbs. (Note that you cannot use the GE add on switch for this as it does not have a radio.) These look exactly like a regular switch.
As @Bry noted in another thread, the 2019 Inovelli model is designed specifically for this.
Physical switch for smart bulbs? - #2 by Bry
Zooz has also added this feature to many of their models.
Once the switch is installed, you can use the official smartlights feature to have the bulb “follow” the switch.
Note: If the smart Bulb is on the same circuit branch then you will have to hardwire it to always have power. Check your local township, but in most places this is still acceptable in terms of the safety code. Do be aware that if you have to hardwire the bulb, you will not have any way of turning it off if your home automation system is not working. This is one reason that some people prefer The smart switch covers, because then you can just lift up the battery operated device and use the original switch if needed.
- use a battery operated switch. many people prefer to just leave the original switch in place and either put a child safety lock on it or a box cover over it and then put a battery operated switch next to it. Again, the battery operated switch will send a message to the hub and hub will send a message to the bulb. This is a fast and easy solution and typically costs less than the other two options, so it just comes down to the aesthetics. You can see a full list of the battery-operated switches that currently work for this purpose in the buttons FAQ. Read each product description carefully as some other mains powered and some are battery powered.
Many people use a battery powered switch as a parallel means of control for their smartbulbs, so it could even just be the Hue dimmer switch. There are also some battery operated switches like the Cooper “anyplace” Z wave switch which look exactly like their regular switches. So you will have quite a few choices for style and function.
If you are in the US, The Smartest House has introduced a new battery-operated rocker switch which is a simple choice for this:
Or check the FAQ for more options.
- Use a zigbee green energy powered switch that communicates with the Hue bridge
Phillips recently announced a new line of partners who will have wall switches that don’t get wired into the mains but also don’t need batteries. They work just like the existing hue tap switch (the round one), but look like regular wall switches. This will be a good solution for those who are afraid of the batteries running out on the option three devices.
The one in the US can operate either as a single rocker which looks just Like a regular rocker switch, or is two skinny rockers side-by-side. Both are available in many colors, including black and brown.
Much more discussion
The following long FAQ has much more detailed discussion about all of these options if you want to read more. 