This modular extension features an in-line switch and is not dimmable. You can use a maximum of four shades in any configuration. The Floor Lamp initially comes with 3 shades. Large and small extensions are available to add further flexibility to the configuration options. Although customisable, the height must remain under 1750mm. Please note, either an extension or shade from the kit will be a spare part in the final configuration due to the height restriction.