 Solar dials are still used for lighting stairwells and car parks, and in some cases local authorities may request them for street lighting, though this is rare.Solar dials are often found in the rural United Kingdom , but as these fail they are sometimes replaced by a photocell, usually on a new lantern and sometimes with a whole new column.More recently, digital sunrise/sunset tracking time switches have appeared on the market, but these are generally too expensive for large scale use in street lighting and have not been adopted for this purpose, except in a few rare instances.