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The choice of tubular light shafts as a practical upgrade for improving daylighting in existing buildings highlights their effectiveness in enhancing natural light without requiring significant structural modifications. Tubular light shafts, also known as light tubes or solar tubes, are designed to capture sunlight from the roof and distribute it throughout the interior spaces via highly reflective tubes. This technology is particularly advantageous for challenging locations where direct window access to daylight is limited.

One significant reason for their practicality is that tubular light shafts can be installed in various building types without extensive renovations. They are smaller and less invasive than traditional skylights, making them suitable for existing structures. This also means they often have a lower impact on the building's aesthetics while still bringing in substantial natural light.

Moreover, tubular light shafts can be designed to minimize heat gain and loss, enhancing energy efficiency. They effectively channel daylight to areas that typically rely on artificial lighting, thus reducing energy consumption and improving occupant comfort.

In contrast, while skylights and operable windows can also improve daylighting, their installation often requires more substantial changes to the building's roof or walls, which may not be practical in certain contexts. Exterior shading devices focus on managing glare and controlling light rather than directly improving daylight access, making them supportive but not primary solutions for enhancing