What the two abbreviations claim
CLR (Ceiling Light Rejecting) stresses overhead fixtures. UST ALR (Ultra Short Throw Ambient Light Rejecting) stresses that the screen is cut for ultra-short throw, light from below. Treating them as one family in a shop is not wrong. It does not make every panel the same.
Where they agree
Neither is a plain white sheet. Both assume light arriving from the bottom edge, and use a sawtooth or lenticular microstructure to swallow or fold away ceiling light. Point a long-throw, ceiling-mounted host at this family and the screen will reject the picture too.
Three questions that still matter
- Optics: lenticular (horizontal teeth), Fresnel (concentric rings), or the CBSP stack NIKOHOME uses.
- Gain and viewing angle: 0.6–0.8 is wider; past 1.2 is brighter and pickier about seats.
- Form: floor-rising, ceiling, drop-down, fixed frame — the optics can be right and the house still has to take it.
How NIKOHOME uses the words
Living-room plans are written as CBSP ultra-short-throw ALR. We do not put a long-throw ALR on a UST host, and we do not sell the three letters CLR as a feature. For gain, read how to choose gain. For the rise, read how to choose a screen.