New Lighting techniques, equipment and more efficient light sources present the lighting designer with the tools to meet the challenge of the ever-changing requirements of the merchandizing world and the spiraling cost od energy. A well-designed lighting installation provides sufficient light in the right place at the right time. A lighting installation that satisfies the cirteria for efficient design enables the occupants to see easily confort, allowing them to perform thier work efficiently, with minimum visual strain, and thus reduscing the effects of visual fatifue.