LG CineBeam S.

The Gavler Review.

LG CineBeam S Review: A 4K Laser Projector That Fits Where Others Can't

The LG CineBeam S ranks #4 on Gavler's Best Projectors list with a 9.3 score, and it earns that ranking for doing something almost no other 4K projector at this price can: producing a 100-inch image from just over 15 inches away. That ultra-short-throw lens is the entire pitch — it turns apartments, dorm rooms, and cramped living rooms into big-screen spaces without a ceiling mount or a ten-foot throw distance. The catch is brightness. At roughly 500 ANSI lumens, this is strictly a dark-room projector, and Expert Reviews found that "add much ambient light to the mix, and it's hard to get a semi-decent picture."

What it is

The CineBeam S (model PU615U) takes the internals of LG's well-regarded CineBeam Q portable projector — a 3-channel RGB laser light source, 4K UHD resolution via DLP pixel-shifting, and LG's webOS smart platform — and pairs them with an ultra-short-throw optical system. Projector Reviews, which tested both models, described it plainly: "feature and performance-wise, the PU615U is similar to the award-winning LG CineBeam Q (HU710PB) except it is equipped with an ultra-short-throw lens — a significant distinction for small spaces." It produces a 40-inch image from 3.2 inches away and scales to 100 inches from just over 15 inches, which means the projector sits on a low shelf or media console directly beneath the screen rather than mounted on a ceiling or set several feet back.

Because it runs webOS — the same platform LG uses in its televisions — it doesn't need an external streaming box. Netflix, Disney+, Prime Video, and the rest are built in, along with AirPlay 2 and screen mirroring for phones and laptops. Auto Screen Adjustment and auto focus handle alignment on their own, which matters more here than on a standard-throw projector, since even small placement shifts create noticeable geometry errors at these projection angles.

In use

Color is where the CineBeam S genuinely surprises. Gavler's verified data cites LG's claimed 154% DCI-P3 coverage, and independent testing backs up that the panel performs well above its price and size class. Expert Reviews ran its own colorimeter tests and reported "93.8% coverage of DCI-P3 with a 107% gamut volume" — phenomenal by the standard of any projector, let alone a compact one — adding "on this count, the CineBeam S is punching way above its weight." Projector Reviews measured actual brightness output at 554 lumens in Brightest mode, slightly ahead of LG's own 500-lumen rating, though picture-accurate modes like Filmmaker Mode dropped output closer to 385-390 lumens.

That accuracy comes with real limits once you leave a dark room. Expert Reviews summarized the trade-off after extended testing: "at further distances with bigger screens, the image loses some of its vibrancy and a smidgeon of its sharpness, meaning it falls behind bigger, brighter options." Projector Reviews reached a similar conclusion, noting that "while the CineBeam S delivers impressive brightness for its compact size, there are portable projectors in the same price range that can deliver double the light output."

Audio is the other honest weak point, and both outlets independently landed on it. What Hi-Fi's verdict in Gavler's baseline data was blunt: the projector "sets new picture standards for ultra-portable projectors but is let down by its sound quality." Expert Reviews' hands-on listening test went further, describing output that "starts thin at lower volume levels and grows really harsh as you push them upwards, to the extent that I found action films like John Wick 3: Parabellum or Furiosa hard on the old lugholes."

Strengths

• Genuine 4K resolution with a wide color gamut. Independent measurement (93.8% DCI-P3, 107% gamut volume per Expert Reviews) confirms LG's color claims hold up, not just on a spec sheet.
• Placement freedom nothing else at this price matches. A 100-inch image from roughly 15.5 inches of wall clearance solves the throw-distance problem that rules out most projectors in small rooms.
• Fast, largely automatic setup. Auto Screen Adjustment and auto focus realign the image "within seconds," per Projector Reviews, when the unit is moved.
• Built-in webOS smart platform. No external streaming box required — the same interface LG uses across its television lineup.

The trade-offs — who should skip it

This is a dark-room projector, full stop. If your viewing space has windows you can't fully block or lights you don't want to kill, the CineBeam S will disappoint you — Expert Reviews' verdict was that it "really only works in a dark room." Audio is the second compromise: both Projector Reviews and Expert Reviews flagged the built-in speakers as inadequate for anything beyond casual, quiet viewing, and Expert Reviews found volume pushed past moderate levels turns harsh. Budget for a soundbar. Expert Reviews also reported inconsistent auto-alignment on some screen surfaces, requiring the auto-adjust feature to be manually disabled after initial setup to stop the image from drifting mid-film. Buyers who need a bright, multipurpose living-room projector should look elsewhere in this category.

How it compares

Against the Optoma GT4000UHD — ranked #5 on this same list — the calculus is brightness versus price. The GT4000UHD costs considerably more but delivers roughly 8x the light output at 4,000 lumens, making it usable in rooms with partially open blinds where the CineBeam S simply washes out. If your space can go fully dark, the CineBeam S's smaller footprint and lower price make more sense; if it can't, the GT4000UHD is worth the premium.

The Gavler verdict

At 9.3 and rank #4 on Best Projectors, the LG CineBeam S earns its score on the strength of an idea few competitors have executed this well: real 4K color performance in a box small enough to sit on a shelf inches from the wall. Just go in with clear eyes about the trade-offs — this is a dark-room projector with thin built-in sound, not a do-everything living-room replacement for a TV.

Common Questions

Is the LG CineBeam S worth it in 2026?

If you need a projector that sits inches from the wall, yes — it ranks #4 on Gavler's Best Projectors list at 9.3, and Projector Reviews called its picture 'nearly identical' to the award-winning CineBeam Q with the added flexibility of an ultra-short-throw lens. Just budget for a dark room and expect to add external speakers.

How bright is the LG CineBeam S in a normal living room?

Rated at 500 ANSI lumens, though Projector Reviews measured 554 lumens in Brightest mode. Expert Reviews found it 'really only works in a dark room' and that adding ambient light makes it 'hard to get a semi-decent picture' — this is a dark-room projector, not a bright-room lifestyle screen.

LG CineBeam S vs Optoma GT4000UHD — which ultra-short-throw projector should I buy?

The CineBeam S is smaller, cheaper at $1,299, and delivers exceptional color for its size but caps out around 500 lumens. The Optoma GT4000UHD costs far more but pushes 4,000 lumens, making it the pick for rooms with any ambient light — the CineBeam S is for spaces you can fully darken.