A luminaire comprising: - a lighting arrangement comprising an LED (D L) wherein an on or off state of the LED (D L) is controlled by a lighting control signal (S L), and an LED lighting driver comprising: - a switched-mode power supply comprising: - an inductor connected to the lighting arrangement, wherein a current (I 6) through the inductor defines a current (I 2) through the lighting arrangement; and - a primary control system adapted to maintain a current (I 6) through the inductor and lighting arrangement within a predetermined range using a switching regulator (T B, D B); - a supplementary control system adapted to: - receive a supplementary control signal (S SUP) indicative of a desired off-on transition of the LED (D L); and - in response to the supplementary control signal (S SUP) indicating a desire to switch the LED (D L) to an on-state, override the primary control system and alter the current (I 6) through the inductor to a predetermined level; and a lighting control system adapted to output the lighting control signal (S L) and, in response to the current (I 6) through the inductor being altered by the supplementary control system (S SUP) and reaching the predetermined level, control the lighting control signal (S L) so as to switch the LED (D L) to an on-state, characterized in that the lighting arrangement further comprises a bypass transistor (T L) connected in parallel with the LED (D L), wherein the bypass transistor (T L) is adapted to control a current flow in the LED (D L) based on the lighting control signal (S L). - a lighting arrangement comprising an LED (D L) wherein an on or off state of the LED (D L) is controlled by a lighting control signal (S L), and an LED lighting driver comprising: - a switched-mode power supply comprising: - an inductor connected to the lighting arrangement, wherein a current (I 6) through the inductor defines a current (I 2) through the lighting arrangement; and - a primary control system adapted to maintain a current (I 6) through the inductor and lighting arrangement within a predetermined range using a switching regulator (T B, D B); - an inductor connected to the lighting arrangement, wherein a current (I 6) through the inductor defines a current (I 2) through the lighting arrangement; and - a primary control system adapted to maintain a current (I 6) through the inductor and lighting arrangement within a predetermined range using a switching regulator (T B, D B); - a supplementary control system adapted to: - receive a supplementary control signal (S SUP) indicative of a desired off-on transition of the LED (D L); and - in response to the supplementary control signal (S SUP) indicating a desire to switch the LED (D L) to an on-state, override the primary control system and alter the current (I 6) through the inductor to a predetermined level; and - receive a supplementary control signal (S SUP) indicative of a desired off-on transition of the LED (D L); and - in response to the supplementary control signal (S SUP) indicating a desire to switch the LED (D L) to an on-state, override the primary control system and alter the current (I 6) through the inductor to a predetermined level; and a lighting control system adapted to output the lighting control signal (S L) and, in response to the current (I 6) through the inductor being altered by the supplementary control system (S SUP) and reaching the predetermined level, control the lighting control signal (S L) so as to switch the LED (D L) to an on-state, characterized in that the lighting arrangement further comprises a bypass transistor (T L) connected in parallel with the LED (D L), wherein the bypass transistor (T L) is adapted to control a current flow in the LED (D L) based on the lighting control signal (S L).