Recent studies have found that prolonged exposure to artificial lighting can be damaging to one’s physical and psychological health. Whereas providing natural daylight can increase productivity up to 10%.These benefits are more noticeable in official, retail and educational buildings. This paper deals with improving illumination in our work spaces, specially targeting office and educational spaces where illumination lux is as high as 450 and reducing electricity consumption of the building through the use of central illumination in the roof cavity. The developed retrofit would be applicable only in 12-hr working building such as retail, offices, factories and educational spaces. In all these buildings recommended illumination lux is of range 300-450.

Retrofit would be core right through the roof of the building and it would be like a hollow cuboid with its two sides made of a special translucent material and the other two sides concave mirrors facing inside the core. The translucent material opted is polycarbonate after considering all its properties like durability over a long period of time and that it is a natural ultraviolet filter.

Experimental outcomes were taken from a miniature form of a scaled down actual building. The readings were taken using a well calibrated lux meter. The movement of sun was replicated using a Ring Heliodon. By doing the feasibility analysis of the device it was found that this device can work on par with other day lighting techniques. The payback period of this device was around 5 yrs.