What is Day Lighting

Horace He

Last Updated: December 26, 2023

What is Day Lighting

Day lighting is the practice of utilizing natural sunlight to illuminate indoor spaces during daylight hours. It involves the strategic placement of windows, skylights, and other transparent elements in a building’s design to maximize the entry of natural light. The goal of day lighting is to reduce the reliance on artificial lighting, resulting in energy savings and a more sustainable approach to lighting design. By harnessing natural light, day lighting not only reduces electricity consumption but also creates a visually stimulating and productive environment for building occupants.

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To achieve effective day lighting, several factors need to be considered. The size, location, and orientation of windows and skylights are all important in optimizing the amount of natural light entering the space. South-facing windows are ideal for maximizing winter sunlight while minimizing direct sun exposure during the summer, while north-facing windows provide relatively even, natural light without causing glare or unwanted heat gain.

East- and west-facing windows are beneficial for daylight penetration in the morning and evening, respectively, but may require additional measures to control glare and excessive heat gain during the summer months. The design of shading devices, such as blinds or shades, can help regulate the amount of light entering the space and prevent discomfort.

Day lighting not only offers energy and cost savings but also has positive effects on human well-being and productivity. Studies have shown that exposure to natural light can improve mood, increase alertness, and enhance cognitive performance. It also provides a connection to the outdoor environment, creating a sense of comfort and connection to nature.

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