1. Ultra-clear glass: Pursuing ultimate transparency
Core objective: Maximize light transmittance and minimize color distortion.
Principle: By significantly reducing the iron content in the glass (the root cause of the greenish tint in ordinary glass), the absorption of light is decreased. Its surface remains smooth.
Light transmittance: Generally above 91.5%, high-quality ultra-clear glass can reach 92%-93% (ordinary float glass is usually around 89%). This means that it can allow the maximum amount of light to pass through, with almost no color difference. The image display is extremely clear, transparent and has a "crystal" feel.
Disadvantages: The surface is smooth and will produce strong specular reflection and glare under strong light (such as sunlight or spotlights), which will interfere with viewing.
2. Anti-glare glass: Pursuing a comfortable visual experience
Core objective: Eliminate specular reflection and dazzling glare, and enhance visibility in complex lighting conditions.
Principle: Through methods such as chemical etching or physical spraying, a fine and rough structure (unevenness) is formed on the surface of the glass. These structures break down the concentrated specular reflected light into soft diffuse reflection light.
Light transmittance: It will inevitably decrease. The light transmittance of high-quality anti-glare glass is approximately between 89% and 91%. This part of the lost light is precisely scattered by the surface microstructure.
Advantages: It greatly reduces reflection and glare. Even when there is a strong light source behind, the content on the glass can still be clearly seen (such as museum display cases, picture frames, electronic photo albums). The surface has a texture, a soft touch and is not easy to leave fingerprints.
Important Note: Understanding of "Light transmission"
Many people believe that the higher the light transmittance, the clearer it appears. This is correct under ideal laboratory conditions. However, in actual usage environments, the interference of ambient light is the primary issue.
A piece of ultra-white glass with a light transmittance of 93% but severe reflection may look like a mirror under the light, and nothing behind it can be seen at all.
A piece of anti-glare glass with a light transmittance of 90% enables you to clearly see the content from any Angle and under any light.
Therefore, the choice of which type of glass to use does not depend on the tiny difference in their absolute light transmittance values, but entirely on your application scenarios and primary needs:
Choose ultra-clear glass: When you need an ultimate sense of transparency and color fidelity, and can strictly control the ambient lighting to avoid direct or reflected light from the viewer's eyes. For example, home aquariums and indoor isolated display cabinets.
Choose anti-glare glass: When your equipment or exhibits may be in a complex lighting environment (such as beside a window or in a room with multiple lights), and eliminating reflections, enhancing visibility and viewing comfort are your top priorities. For instance, wall-mounted picture frames with lights, display stands facing Windows, and electronic screens that require long viewing periods.
Summary: The absolute difference in light transmittance between ultra-clear glass and anti-glare glass is not significant (about 2%-4%), but the optical properties (reflective or not) resulting from this are vastly different. Anti-glare glass sacrifices a small amount of absolute light transmittance in exchange for better visual clarity and comfort in actual environments.
