10/16/2026
A brighter room doesn’t always need a bigger window.
Window size matters, but so does Visible Transmittance (VT) — a rating that indicates how much visible light passes through a window system.🪟🔆
A higher VT generally means more daylight enters the space. But the right number depends on more than brightness alone. Window orientation, glass selection, room depth, privacy needs, and glare all shape how that daylight actually feels.🏠🩷
That’s why VT is most useful as part of a larger design conversation, not as a number to maximize on its own.
When reviewing window options, ask two questions: How much daylight does this room need? And how will that light behave throughout the day?
Save this for your next window or glass review.📄