YOKIS dimmer modules are connected to the mains supply (230Vac) and are able to dim loads connected to this type of voltage; dimming of lamps provided with transformers/converters with 230Vac on the primary and 12Vdc-18Vdc-24Vdc on the secondary is permitted provided that these transformers/converters have a primary that, when dimmed, produces load dimming on the secondary, i.e. they are dimmable converters. Some transformers/converters on the market have pre-set inputs for connecting adjustable dimmers (e.g. 0-10V, 1-10V, DALI); the YOKIS dimmer cannot be connected to these types of inputs.