A lighting circuit comprising - a first array comprising a first string of series-connected semiconductor light sources and a separate second array comprising a second string of series-connected semiconductor light sources; - a shared array comprising: - a shared string of series connected semiconductor light sources; - a first rectifying diode arrangement (RH, LH0) coupled between the shared string of series-connected semiconductor light sources and the first array; and - a second rectifying diode arrangement (RH, LH0) coupled between the shared string of series-connected semiconductor light sources and the second array; characterized in that: - the first array, the second array and the shared array are matched with respect to their respective forward voltages; the lighting circuit further comprises: - a first driver arranged to drive the first array and the shared array, wherein the first rectifying diode arrangement (RH, LH0) is further connected between the first driver and the shared array; and - a second driver arranged to drive the shared array and the second array, wherein the second rectifying diode arrangement (RH, LH0) is further connected between the shared array and the second driver. - a first array comprising a first string of series-connected semiconductor light sources and a separate second array comprising a second string of series-connected semiconductor light sources; - a shared array comprising: - a shared string of series connected semiconductor light sources; - a first rectifying diode arrangement (RH, LH0) coupled between the shared string of series-connected semiconductor light sources and the first array; and - a second rectifying diode arrangement (RH, LH0) coupled between the shared string of series-connected semiconductor light sources and the second array; characterized in that: - the first array, the second array and the shared array are matched with respect to their respective forward voltages; the lighting circuit further comprises: - a first driver arranged to drive the first array and the shared array, wherein the first rectifying diode arrangement (RH, LH0) is further connected between the first driver and the shared array; and - a second driver arranged to drive the shared array and the second array, wherein the second rectifying diode arrangement (RH, LH0) is further connected between the shared array and the second driver. - a shared string of series connected semiconductor light sources; - a first rectifying diode arrangement (RH, LH0) coupled between the shared string of series-connected semiconductor light sources and the first array; and - a second rectifying diode arrangement (RH, LH0) coupled between the shared string of series-connected semiconductor light sources and the second array; - the first array, the second array and the shared array are matched with respect to their respective forward voltages; - a first driver arranged to drive the first array and the shared array, wherein the first rectifying diode arrangement (RH, LH0) is further connected between the first driver and the shared array; and - a second driver arranged to drive the shared array and the second array, wherein the second rectifying diode arrangement (RH, LH0) is further connected between the shared array and the second driver.