This research looked at how natural light affects working conditions in office buildings in Dhaka, Bangladesh. They studied eleven office buildings and focused on one in detail. They found that the inner areas of the office didn't have enough light for work. To fix this, they suggested using something called light shelves as part of the building's design. These shelves were tested at different heights and angles to see how they could make the office brighter without needing too much electric light. The goal was to make the office spaces better lit and more comfortable for office work while also saving energy.