Do you need an ALR screen for a UST projector?
No — not strictly. What an ultra-short-throw projector needs depends on your room's light, and the screen rule that IS non-negotiable points the other way. Here's the honest version, straight from our compatibility engine.
Do you need an ALR screen for a UST projector?
No — not strictly. In a light-controlled room, a UST projector on a standard matte-white screen works, and our compatibility engine flags that pairing as an advisory note, not an error: it's more susceptible to ambient light — in a dark room it's fine, and a UST-specific ALR/CLR screen is what we recommend once the room is bright. The rule that IS non-negotiable points the other way: a CLR screen bought for a UST projector only images correctly WITH one — put a conventional-throw projector in front of it and the picture will be dim and uneven, which our engine flags as a hard error. And where our data can't check — a projector with no stated throw type, or a screen with no stated material — we say "can't check" rather than pass the pairing. If you're still choosing the projector, both units in our laser-TV comparison are USTs, and everything below applies to them.
What's the difference between ALR and CLR screen material?
Direction. Both classes reject ambient light; they differ in which directions they reject it from. A standard ALR material like the Elite Screens Sable Frame CineGrey 3D ($458 tracked, stated gain 1.2 with a stated 90° half-gain angle) rejects light arriving off-axis — it's built around a conventional projector whose beam arrives head-on from across the room. CLR material — 'ceiling light rejecting', recorded in our catalog as CLR or UST-ALR — is the UST-specific subclass: a lenticular surface of microscopic louvers that accepts the steep up-fired beam a credenza-mounted UST throws while rejecting light from above, where ceiling fixtures live. The Aeon CLR 3 states 0.8 gain; the EPV EF115HUST-DS2 states 0.8 gain with a 160° half-gain angle. That geometry is the whole reason the classes exist — and why the hard rule below only runs one way.
Can you use a CLR screen with a conventional projector?
No — this is the one hard rule of the category. A CLR surface rejects light arriving from above and below by design, and a conventional projector's beam arrives from exactly the angles it rejects: the picture will be dim and uneven. Our builder encodes this as an invariant — CLR-class material plus any non-UST projector is an error, not a preference — and the rule is deliberately asymmetric: a UST on a standard screen merely gives up ambient-light resistance, but a conventional projector on a CLR screen gives up the picture. The buying consequence: a CLR screen is a commitment to the UST category — if you later swap to a conventional-throw projector, the screen goes with it. A standard screen keeps both doors open, at the cost of bright-room performance with a UST.
What does screen gain actually mean?
Gain is how much light the screen returns toward the seats compared with a reference white surface — 1.0 is neutral, higher is brighter on-axis, and the usual price is viewing angle or light rejection. Our catalog's stated spread tells the story: the light-rejecting UST materials sit lowest, at 0.8 (stated on both the Aeon CLR 3 and the EPV EF115HUST-DS2), because a surface that rejects room light gives up some projector light too. High-contrast grey sits between (the Silver Ticket STR-169120-HC, $459.98, states 0.95), and matte white runs 1.0–1.3: the CineTension2 states 1.0, the CineTension3 1.1, and the Sable Frame 2 and Stewart StudioTek 130 G4 both state 1.3. A 0.8-gain CLR screen therefore asks more of the projector's light output — one reason UST 'laser TVs' advertise 3,000–4,000 lumens. And where a maker doesn't state gain, we record the blank instead of assuming 1.0: the original Aeon CLR's gain is exactly such a gap in our data.
Which UST screens do we track?
Three, honestly differentiated. The Elite Screens Aeon CLR at $415.95 tracked is the price floor: 103" 16:9 CLR material in a stated aluminum fixed frame — but its gain is unstated in our data, so you'd be buying it without the one optical number the other two publish. The Aeon CLR 3 at $728 tracked (against a $1,400 MSRP) states its 0.8 gain but leaves its form factor and frame material unstated — the two Elites disclose almost opposite halves of the sheet, which is why we line them up field by field. The EPV Screens EF115HUST-DS2 at $3,271 tracked is the documented one: 115", stated 0.8 gain, a stated 160° half-gain angle, and a stated 5-year warranty — whether that's worth 4.5× the Elite gets its own honest page. Browse the rest in projector screens, pick the projector side with our bright-room guide, and let the builder check the pairing — it enforces every rule on this page from the same normalized fields.