2 – Luminaire spec and visual check
When the uniformity (Uo) is < 0.4 (minimum) customers experience shadows and contrasts. This can cause dark spots on walls and vitrine, having difficulty recognizing the products.
Products behind the vitrine are difficult to recognize due to daylight reflections. The right position of the lighting can reduce the reflections. When unified glare rating (UGR) of luminaire is >22(maximum) customers experience the lighting as uncomfortable. This can also cause disturbing reflections on the glass.