India, April 6 -- The visible spectrum consists of white light which is a combination of seven main colours called 'VIBGYOR' which stands for the colours, Violet, Indigo, Blue, Green, Yellow, Orange and Red. These Colours, depending on the colour and intensity have deep psychological effects on a person's moods and hence have to be used sensibly for creating a good, positive environment. The effect of colours has been explained under Vastu Colours of a House.

In climatology, heat and light are intrinsically linked. Blind belief in looks and sometimes in light has led people to have big windows, resulting in heated-up interiors. Incidentally, one major shift in Indian buildings has been from small wooden windows to large sheet glass windo...