ALR is the broader term
ALR means ambient light rejecting. It describes screens engineered to favor projector light while reducing the effect of unwanted room light. The important part is direction: a surface cannot intelligently identify “projector” photons. It works through optical geometry.
CLR is usually a directional subset
CLR is commonly used to mean ceiling light rejecting. In UST rooms, that usually refers to a layered or structured surface that accepts steeply rising light from the projector and rejects more light arriving from above.
Why labels are not enough
Two screens can both be marketed as ALR while using different structures and having different viewing cones, gains and rejection patterns. Check throw compatibility and optical orientation rather than buying on the acronym alone.
For UST projectors, geometry is the deciding factor
A UST projector normally sits below the image and directs light upward. A compatible lenticular-style screen is built to send that light toward viewers. Put the same material upside down or pair it with the wrong throw geometry and performance can change dramatically.
How the NothingProjector Black Series is positioned
The current merchant page calls the Black Series a 95% ALR/CLR screen for UST projectors and lists 0.6 gain. That places it squarely in the directional-screen category where room-light control and projector placement need to be considered together.
Want to judge the material in your own room?
The sample is intended to let you inspect the Black Series material before committing to a full screen. Check current stock, price and refund terms on the merchant page.
View the A4 sample ↗