Where you put the light in a display cabinet matters more than how bright it is, and almost everyone puts it in the wrong place.
The instinct is to fix the light at the top of the cabinet against the back panel, tucked out of sight. Do that and the beam runs straight down the back board. It lights the back of the cabinet beautifully and leaves everything on the shelves as a silhouette, because the objects are lit from behind rather than in front.
So our master Indian artisans set the lights at the head of the cabinet but forward - just behind the top rail, in front of the shelf line - so the beam falls down onto the fronts of what is displayed. The objects are lit on the face you are looking at.
The second decision is the shelves. Timber shelves stop light dead at the first one. Glass shelves let it pass, so a single set of lights at the head reaches the bottom of the cabinet. That is why every shelf here is glass and not one of them is solid.
Both decisions have to be made before the carcass is built, because the wiring runs inside the timber. Neither can be added afterwards without cutting into a finished cabinet.