Visual or fixture specification check:
Unified Glare Rate UGR = 28
Light uniformity Uo = 0.4
When unified glare rating (UGR) of luminaire is >28
(maximum) occupants experience the lighting as
uncomfortable and blinding.
When the uniformity (Uo) is < 0.4 (minimum)
occupants experience shadows and contrasts, feeling
uncomfortable and have difficulty recognizing faces.
Step 3: Check state of installation