Analysis of light tubes in interior daylighting system for building

Badri Narayan Mohapatra, M Ravi Kumar, Sushanta Kumar Mandal


Analysis of vertical light tubes, and diffuser as daylighting system in buildings is presented. The solar light energy is directly addressed to the chosen area of the building with a light tube and diffuser guiding structure. This work highlights illuminance obtained by light tubes in a three storied office building. Field investigation with a scaled prototype, and simulations with HOLIGILM, and DIALux are analyzed. It is observed that light tubes can offer large savings in electricity usage by using natural daylight.


Daylight Optical tube; Illuminance; Light design; Energy saving

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