Lutron Caseta are great in standard US homes (I use them in my own house.) 
Unfortunately they aren’t going to work for the case presented in this thread, because they are not Available for 220V. 
For people in countries that use 220 V electrical systems, the usual two suggestions are
- Aurora zigbee. Some models do not require a neutral. However, these can be hard to find and some community members have indicated they only work with some specific LED lights.
Community discussion thread:
Some Aurora AOne Zigbee Devices added to official list (UK for now)
- Zwave Aeotec nano dimmer. A more popular option has been the aeotec nano dimmer, although you may need to add an additional bypass device if the load is too low. These work very well with smartthings and Aeotec does manufacture them for different regions, including North America, Europe and the UK, Asia, and Australia. You just have to make sure that you are getting the model with the Z wave frequency that exactly matches your smartthings hub Z wave frequency.
The aeotec devices have proven to be reliable and seem to work with a wider choice of lamps.
That said, both of those are fairly expensive devices. There are some other less expensive No neutral options from China for 220v. I think coolcam has a model that doesn’t require a neutral, but I don’t remember specifically. There are some others though. if you happen to find a Z wave one, again, remember to check that it matches the frequency of your own hub exactly.
@jelockwood and @csc have both done considerable research into 220V switches that do not require a neutral, and might have more to add.