Shoppers do not measure lux. They do notice being dazzled.
Discomfort glare comes from a bright source inside the normal field of view. A shallow fitting with a bright reflector puts the LED almost at the ceiling plane, visible from halfway down an aisle. Doubling the lumens of that fitting makes the problem worse, not better.
Recess the source and darken the reflector. A deep reflector creates a cut-off angle below which the source is simply not visible; a gun-black or matte-black finish stops the reflector wall itself from becoming a secondary bright surface.
Deeper reflectors and darker finishes cost some efficiency — a portion of the light is absorbed rather than redirected. That is the price of a comfortable room, and it is why comparing two spotlights on lumens-per-watt alone tells you almost nothing about which one you want above a jewellery case.
Ask for the cut-off angle, the reflector finish options and a sample you can install in a mock-up ceiling at the real mounting height. We would rather send the sample.
Send us the room and the ceiling and we will tell you what we would specify and why.
