Control direct view, reflected glare and high-angle brightness before a fitting reaches the ceiling or wall.
Direct view is only the first test
A recessed source can still produce high-angle glare from a rear seat, and a hidden strip can reflect in polished metal, leather or a glazed control screen. Review all seating positions and likely head heights, not only the centre line.
Shielding beats lower output
Dimming a visible source reduces light but does not change its contrast against a dark ceiling. Deep regress, baffles, louvres and careful aiming often produce a more comfortable result while preserving useful illumination.
Check the pause scene
Glare is often most obvious when a small number of lights remain on during pause. Commission this scene after dark adaptation and verify that viewers can move safely without staring into a bright aperture.
Good cinema lighting gives the room exactly enough information—and no more.
A practical specification sequence
Define the visual intent and the scene in which the light will operate. Confirm the fitting, driver, control method, circuit and physical access together. Build a representative mock-up where the detail is sensitive, then commission the final level from every seating position with the projection system running.