All our DIY-M-KITs are dimmable
Remove the black rubber cap on the driver and use a small screwdriver to turn the relatively deep laying screw to the left to dim down. Put the cap back on, the thing will be lost quickly.
Left Turn: 50% - 700mA - (25W per CXB3590)
Right Turn: 100% - 1400mA - (50W per CXB3590)