It’s a two-part sign. The lower part gets anchored to the wall. The upper part is attached to the lower part, but it gets “cantilevered” a bit out into space.
Back view of the lower part:
I later added a PWM motor controller so the LED brightness could be controlled, allowing running them at less than full brightness, to run cooler and extend their lifespan.
Front view of the upper part:
Front view of the upper part:
The assembled, complete sign:
The LED are 24v chip-on-board, aka COB.