Effect of Naked and glaring lights on efficiency

According to Vastu rooms should have low glaring and covered lights because high glare bulbs are said to reduce human efficiency & efforts. This is a common thinking that we even feel irritated while exposed to glaring sun or light for long hours but we don realize its effect on our well-being capability. Naked bulbs should always be covered in rooms as they can also lead to other problems, here are enlisted some problems arise from naked bulb and uncovered lights: http://www.vaastu-shastra.com/glaring-and-naked-lights-affect-efficiency.html