ALR vs CLR Projector Screens: What the Terms Mean

ALR and CLR are often used together in UST marketing. Here is the useful distinction—and what matters more than the label.

ALR: ambient light rejecting

ALR is a broad category label for projection surfaces designed to reduce the effect of unwanted ambient light while reflecting useful projector light toward the audience.

CLR: ceiling light rejecting

CLR typically emphasizes rejection of light arriving from above, which is especially relevant in living rooms with ceiling lights.

Why the distinction blurs for UST

UST listings often describe the same directional material as ALR/CLR. What matters is compatibility with the steep UST light path.

Do not compare acronyms alone

Compare gain, viewing angle, screen structure, compatible projector geometry and independent measurements where available.

Vividstorm's terminology

The S PRO P merchant listing describes its surface as UST ALR/CLR lenticular technology.