Example embodiments relate to light systems with controllable branches of light elements. One example light system includes at least two parallel branches, each branch including a series connection of a plurality of light elements and a switching element. The at least two parallel branches are intended to share a common regulated current source configured for feeding the at least two parallel branches. The light system also includes a control module having a supply input line and at least two control output lights. The at least two control output lines are connected for controlling the switching elements of the at least two parallel branches. The control module optionally includes a galvanic isolation. The control module is configured for controlling the switching elements of the at least two parallel branches according to at least two different control schemes: a first control scheme and a second control scheme.