Disclosed is a lighting system and a method to change the internal light source of the lighting system, wherein maintenance and aesthetic considerations make it necessary to access the internal light source solely from the front of the lighting system without moving or removing a sign face. The method includes applying a first negative voltage to a gate causing a dynamic balance state. The root fixture and the tip end fixture are provided as separate transportable units. Then, a lateral acceleration proportional and derivative term of the estimated lateral acceleration is determined and roll angle reduction is implemented when the lateral acceleration PD term exceeds a first threshold.