LG HU70LS Review – LG’s 4K PJ is smarter than the rest

This WebOS-powered long-life LED projector wants to replace your LCD TV. Steve May wonders if he’s looking at a home cinema game-changer. Read our LG HU70LS Review.


4K HDR LED projector with smart hub integration

One of LG’s more conventional 4K models, alongside ultra-short-throw laser options

Optoma UHD51; BenQ TK850

THE LG CINEBEAM HU70LS is smarter than the average 4K home theatre projector… in every sense.

Most obviously, it’s far more presentable. Rather than reflect the boardroom style of its peers, the case is trendy white with sharp lines and discreet vents left and right of the offset lens.

And at just 3.2kg, this Cinebeam is a relatively easy model to ceiling mount, although most users will simply place it on a coffee table as and when they want to use it.

It’s also smart in the connected sense. The HU70LS is built around LG’s much-liked WebOS smart TV platform, here in its v4.5 iteration. A familiar fixture on LG’s flatscreen TVs, it offers much of the same functionality. So is this the bigscreen beamer we’ve all been waiting for?

Simple setup

Connectivity is good enough. To the rear are two HDMI v2.0 inputs, one of which is ARC enabled, plus two USB ports, a digital audio optical output and headphone jack. Ethernet is available, offering a wired alternative to Wi-Fi and Bluetooth.

Getting up and running is a doddle, although a lack of image shifting (beyond digital keystone correction) means you’ll want to be as square-on as possible. Zoom and focus adjustment controls are manual.

The throw is reasonable and will suit the average living room, with a ratio of 1.2-1.5:1 and a 1.25x zoom. To cast a 100in image, you’ll need around three metres from lens to screen. LG insists a display up to 140in diagonal is possible, although that might be pushing it a bit, at least in terms of overall brightness.

The remote control is an all-white derivation of the Magic Remote familiar from LG’s smart TVs, bolstered with backlit buttons, which is a nice touch. It comes with dedicated shortcuts for Netflix and Amazon Prime.

In use, the experience is definitely more smart TV than conventional projector, which immediately makes it a slicker proposition than most rival home cinema PJs.

Calling up the WebOS interface reveals a familiar launchbar with web browser, photo, video and music players, plus a file viewer for connected USB devices. An input menu offers a quick click to HDMI and USB sources.

You can also connect your smartphone to the projector via Bluetooth to play music through the LG’s integrated sound system – although, to be honest, listening to Biffy Clyro via the HU70LS is only marginally better than eavesdropping someone else’s headphones.

As you might suspect from its compact size, there’s no conventional lamp onboard. Instead the HU70LS uses an LED light engine. This has the benefit of instant on (and off), and I was just as swiftly impressed. The HU70LS is bright enough to be used in rooms with even quite high levels of ambient light – it’s rated at 1,500 Lumens, but this seems to undersell its performance, and colour impact is pronounced. Chroma accuracy is said to be around 92 per cent of the DCI-P3 colour space.

The projector takes a fresh approach to LED, combining red, green and blue diodes with a fourth so-called Dynamic Green LED, which is used to boost image brightness and contrast. This four-channel application is a significant step up from conventional RGB LED devices, and pays dividends onscreen.

And given that this LG is built around an LED light engine, there’s no need for a colour wheel, and consequently, there’s no characteristic rainbow effect. Pictures are clean and coherent, without irritating colour fringing seen around areas of high contrast. LG also says the technology is not subject to age discolouration.

Another benefit of the LED engine is longevity. With a working life of 30,000 hours, this projector should see you through a complete showing of The Irishman, including credits, and remain essentially maintenance-free during its lifetime.

Mirror image

The projector boasts 4K resolution, courtesy of Texas Instruments’ crafty (and not native 4K) DLP mirror flipping technology, as well as HDR10 support, although the value of the latter is negligible. As is nearly always the way with projectors, the HDR experience is never comparable to what we’re used to seeing on flatscreen TVs, not least because there’s no precise pixel control.

The Boys (Amazon Prime. 4K HDR) is notable for some wonderful HDR grading, but it’s difficult to appreciate here, thanks to the PJ’s subdued overall contrast. When Homelander wipes out the Syrian Compound V factory, it’s only his glowing-red heat vision eyes that make a specular impression. Shadow detail is lost in a fog of grey.

Dynamic Contrast adjustments can help, giving images a little more bite, but improvements are subtle at best.

Since their introduction, we’ve noted different visual performances from Tl’s various 4K micromirror devices, and here the faux UHD mirror-flipping doesn’t really convince at all. Test patterns reveal very little fine detail information that would be indicative of a native 2160p picture, and there’s a smidge of grit to its replication.

So in terms of resolution, some might describe what’s onscreen as more akin to HD-plus. That said, the universal impression is of a cinematic presentation, and the sheer vibrancy and solidity of its colours is a treat. This is an obvious advantage of LED. Despicable Me 3 (Blu-ray) is a veritable Skittle bag of rich hues.

There’s the usual selection of image presets for different content types (Standard, Cinema, Sports, Game, HDR Effect, Expert Bright Room and Expert Dark Room), along with five HDR-centric presets. For most content, I found the Standard and Cinema image options did an entirely acceptable job, but if you want to delve deeper you can. ‘Expert’ tweaks include adjustable gamma, colour management and the aforementioned Dynamic Contrast, which can be set to Low, Medium or High.

One more obvious image foible is HD upscaling, which is largely unimpressive. 1080p sources exhibit clear jaggies on verticals, with buildings often taking on the appearance of steps.

Yet when it comes to motion handling, LG’s TruMotion interpolation (available in Smooth, Clear or User modes) does a suitably icy job. It’s worth experimenting to find a setting you like when it comes to sports or broadcast TV, but for movies I’d almost certainly opt to turn it off.

Operating noise amounts to a constant low-level hum, peaking at around 30dB but never too distracting. A dedicated home cinema sound system should cover it up; the HU70LS has that modest audio system of its own onboard, but at just 2 x 3W it’s hardly going to suffice for a movie night.

Flatscreen challenger

Overall LG’s HU70LS is a classy reinterpretation of the home cinema projector, but not quite an essential audition. I love its contemporary form factor and zero-maintenance LED light engine, and it’s very easy to live with.

Don’t buy this beamer for its 4K HDR appellation alone, though. Allow yourself to be persuaded more by its bright-room clarity, vibrant colour fidelity and smart skills. It’s easy to imagine this model replacing a flatscreen TV altogether


8 Total Score
LG HU70LS Review

This slick 4K DLP beamer is compact and solidly entertaining, and ideally suited for bright-room viewing. Just don't expect HDR thrills.

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3D: No 4K: Yes. 3,840 x 2,160 via Texas Instruments’ XPR technology HDR: Yes. HDR10 CONNECTIONS: 2 x HDMI inputs; digital optical audio output; 3.5mm headphone output; Ethernet; 2 x USB BRIGHTNESS (CLAIMED):1,500 Lumens CONTRAST (CLAIMED): 150,000:1 ZOOM: 1.25x DIMENSIONS: 324(w) x 210(d) x 95(h)mm WEIGHT:3.2kg

FEATURES: DLP LED projector; 2 x 3W built-in audio; 30,000-hour claimed LED lamp life; claimed 30dB fan noise; WebOS 4.5 smart platform; Bluetooth audio output; Wi-Fi; 12-1.5:1 throw ratio; TrueMotion motion processing; gamma, white balance and colour management; Dynamic Contrast; Dynamic Colour; HDR Effect; HDMI ARC; MiraCast


LGSL8YG: Still clinging to shop shelves having launched last year, and available at the time of writing for £, this soundbar/subwoofer combi offers a 3.1.2 Dolby Atmos soundstage via upfiring drivers. Use LG’s Bass Blast preset for a dynamic hit.

1. The LG’s 1.25x zoom delivers a 1.2-1.5:1 throw ratio

2. Discreet side-facing vents are used to maintain airflow

Series Navigation<< OPTOMA UHD52ALV Review – Single chip off the old blockOptoma Hz40 Review – Laser-powered HDR PJ for the masses? >>
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