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Terminology

ALR vs CLR Screen: What Is the Difference for UST?

ALR and CLR are often used inconsistently. Focus on the optical behavior, projector geometry and room rather than the label alone.

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NothingProjector Classic PET Crystal ALR screen promotional image supplied by the site owner
Promotional image supplied by the publisher. It shows an 84-inch label; the current fixed-frame product listing we reviewed advertises 100–150 inch options, so verify the exact size/variant on the merchant page.

ALR means ambient light rejecting. CLR is commonly used to mean ceiling light rejecting. In UST marketing, the terms can overlap because many UST screen structures are designed to reduce light arriving from above while accepting light from the projector below.

Why the label is not enough

Two screens can both carry ALR or CLR language and still behave differently. Ask about projector compatibility, gain, viewing cone, surface structure and which directions of ambient light the screen is designed to manage.

For UST, geometry comes first

Do not buy a long-throw ALR surface simply because it says “ambient light rejecting.” UST requires a screen designed for steep-angle projection from close to the wall.

Use the room as the test

Map windows, ceiling fixtures and seating positions. If the strongest unwanted light comes from above, ceiling-light rejection is relevant. If light is entering from a large side window, the screen's broader directional behavior becomes more important.

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Keep researching

How ALR works

Understand directional light control.

Bright-room screen guide

Apply the concepts to a real room.

PET crystal vs Fresnel

Compare two UST screen structures.