Most MEAN WELL LED drivers have an input AC range that is higher than 240VAC. This allows them to cope with minor power surges, or spikes in the AC line without any trouble.
You can easily request approval documentation, and compliance certificates for your MEAN WELL power supply by completing the Approval Document Request Form.
In some of the MEAN WELL LED driver data sheets you will come across the description “Constant Voltage + Constant Current mode output”, or "Constant Current Mode LED Driver.