How should daylight be used in tropical interiors to avoid glare and heat gain?

• A. Direct sunlight through large windows with no shading.
• B. Use diffusers, light shelves, clerestory shading, high-reflectance surfaces, and exterior shading.
• C. Only artificial lighting.
• D. Opaque walls to block all daylight.

Answer: (B)

In tropical interiors, daylight should be brought in and distributed without creating glare or adding excessive heat. The best approach combines softening and redirecting natural light with strategies that block or cut down the hot sun before it enters the space. Diffusers, light shelves, clerestory shading, high-reflectance surfaces, and exterior shading work together to achieve this.

Diffusers soften direct sunlight so it spreads evenly, preventing harsh hotspots and eye-straining glare. Light shelves bounce daylight up toward the ceiling, increasing distribution deeper into the room and reducing the need for artificial lighting while minimizing glare at eye level. Clerestory shading lets in daylight from higher windows while blocking the lower-angle sun, keeping interiors bright but cooler and less prone to glare. High-reflectance surfaces help distribute the available light more evenly by reflecting it rather than absorbing or concentrating it, which reduces the intensity of direct brightness. Exterior shading intercepts sun before it hits the glass, cutting down both heat gain and glare at the source.

In contrast, letting direct sun pour through large windows with no shading, relying solely on artificial lighting, or using opaque walls to block daylight all fail to balance illumination with comfort and energy use in tropical climates.