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LG GRU510N

By LG · Smart Projectors · Audio & Electronics · More from LG

  • 4K UHD 3840 x 2160 resolution
  • 5000 ANSI lumens brightness
  • Up to 300 in display size
  • Laser light source up to 20000 hours
  • 3000000:1 dynamic contrast ratio

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Summary

Check your room’s light control before you buy — deep blacks are its weak point, and the accurate picture modes cost more than half the brightness.

Strengths

  • Horizontal and vertical lens shift plus 12-point warping make it flexible to mount.
  • The 20,000-hour laser engine needs no lamp replacements and is rated for 24/7 operation.
  • Color is accurate out of the box, with full calibration controls available.
  • HDBaseT, RS-232C and IP control make it friendly for integrator installs.
  • It is compact relative to other 5,000-lumen-class projectors.

Weaknesses

  • Deep blacks are the weak point; the reviewer calls it painfully evident in a dark room.
  • The accurate Cinema and Expert (Dark Room) modes cost more than half the brightness.
  • HDR presets share low contrast and deliver worse shadow detail than SDR with HDR Effect mode.
  • webOS is limited: no AirPlay, Miracast is hit or miss, and there are no Netflix, Hulu or Disney+ apps.
  • Both HDMI ports are 2.0 rather than 2.1, and input lag measured 173 ms at 4K/60 on the sibling.

Verified specifications

Projection systemsingle-chip DLP with a 0.47-inch DMD and XPR pixel shifting.
Resolution4K UHD (3840 × 2160), 8.3 million discrete pixels via XPR.
Contrast3,000,000:1 dynamic.
Light sourcelaser-phosphor (LD + P/W), rated up to 20,000 hours.
Lens1.6x optical zoom, manual zoom ring settable at 1.6x or 1.0x; throw ratio 1.32:1 to 2.11:1.
Lens shiftvertical ±50%, horizontal ±20%.
Screen size40 to 300 inches; a 100-inch image at 9.4 to 15.2 ft.
Noise26/27/29 dB(A) in Economic, Normal and High brightness modes.
HDMItwo HDMI 2.0 ports with HDCP 2.2, 4K at 60 Hz, plus a Game Mode.
Other connectionsHDBaseT, RS-232C, LAN, IP control, two USB 2.0 Type-A ports, 3.5 mm audio out.
Audiodual 5-watt stereo speakers and Bluetooth sound out with AV sync adjustment.
Smart TVwebOS with a web browser; no AirPlay, Miracast screen share, and no Netflix, Hulu or Disney+ apps.
HDRHDR10 with Dynamic HDR Tone Mapping.
Keystone12-point warping (Advanced Edge Adjustment).
Power100–240 V, 50/60 Hz, built-in supply.
Warranty2 years parts and labor.
Dimensions14.6 × 6.1 × 12.8 in (14.6 × 5.7 × 12.8 in without the leg); product weight 25.4 lb.
In the boxprojector, power cord, remote control with batteries, warranty card and manual.
Full research notes and sources

Brightness and color

Presentation is the brightest but green-shifted and loses subtle gradations in photorealistic images; Cinema and Expert (Dark Room) hold gradations better but measured only 1,651 and 1,536 lumens. Brightness uniformity measured 81% at wide zoom and 84% at telephoto, and the zoom lens costs 7% of the light output. On the Spears & Munsil peacock feather demo, individual barbs and barbules were clearly visible — the 4K detail is real.

Black levels and HDR

This is the projector’s weak point. The ProjectorReviews evaluation found it “struggles at reproducing deep blacks, which impacts real world contrast” — painfully evident in a dark room, much less of a factor with ambient light. But on the sibling, none of the HDR presets delivered anything like the shadow detail of HDR Effect mode with SDR content, and all HDR presets share low contrast. An ALR screen improved contrast only a little. The editor’s verdict on the class: “The HU810 is a home theater projector through and through; this unit is not.”

Connections and installation

LG’s webOS is present but thin: no AirPlay support, Miracast described as “frankly a hit or miss,” and no Netflix, Hulu or Disney+ apps — LG’s own spec block documents only a web browser. There are no analog video inputs at all; no VGA, Composite, Component, RGB or S-Video. Both HDMI ports are 2.0, not 2.1, and ProjectorCentral measured input lag of 61 ms at 1080p and 173 ms at 4K/60 on the sibling, so this is not a competitive gaming projector despite its Game Mode. For integrators, HDBaseT, RS-232C and IP control are on board.

Installation is where the projector earns its keep. The 1.6x zoom gives a 1.32:1 to 2.11:1 throw ratio, and the horizontal and vertical lens shift is rare on DLP projectors at this brightness, backed by 12-point warping that goes beyond standard keystone correction. Two cautions from the review: lens shift is interactive, so moving the image in one direction limits shift in the other, and the shift dials slip with a noise at their limits by design — do not force them. There is no lens memory; zoom, shift and focus are all manual. High Altitude mode is recommended at 3,937 feet and above.

Is it worth it?

This is a 2020 design with an MSRP of $3,999, and the value case is narrow. At roughly $3,000 or below, the combination of 5,000-lumen-class output, 4K, H/V lens shift, 12-point warping, HDBaseT and RS-232 in one chassis is unusual — the review’s competitive survey found no laser peer at this brightness with horizontal lens shift and dynamic tone mapping together. In the $3,400 to $4,000 band, value is weak: the same review would pick a bulb projector such as the Epson 6050UB for a darkened theater because its black levels are significantly better, and ProjectorCentral’s editor independently says the class is not tuned for home theater. Above launch price there is no defensible case — newer RGB-laser and triple-laser 4K units have superseded this brightness, contrast and price point, and LG’s own later AU810PW advertises 97% DCI-P3 against this model’s roughly 70%.

Two practical notes cut in opposite directions. Maintenance is essentially nil: the anti-dust optical engine and 20,000-hour laser are described as virtually maintenance free, rated for 24/7/365 operation, with no lamp replacements — a European database puts 20,000 hours at over 13.7 years of four-hour viewing days. But LG closes the service path to owners: the service manual is only available to authorized technicians, and the unit carries a warning never to disassemble it. Warranty is 2 years parts and labor, while the near-identical BU50NST gets 3 years including the light source — at equal price, the business sibling is the better buy on paper. ProjectorCentral lists the BU50NST as discontinued as of June 2024 and still shows it at $3,399; an AVS Forum poll in May 2022 had it at $2,334. LG’s own support answer calls the GRU510N a specialty item that is not widely available through all retail or online sites, so confirm stock and firm pricing before treating it as a live option. Owner evidence for this exact model is thin — the AVS Forum thread has 21 replies and its last post is from December 2021 — so read the absence of failure reports as a small sample, not a clean bill of health.

Which model this is

This page covers the 2020 LG ProBeam GRU510N, a 4K UHD laser-phosphor DLP projector. LG’s own naming is inconsistent: the product page calls it a CineBeam, while LG’s history page and reviewers call it a ProBeam business projector. The hardware is nearly identical to the LG BU50NST — the only difference is the model number, and the BU50NST carries the longer 3-year warranty — and it is related to the later BU50RG. Do not confuse it with the HU810PW, which is a genuinely different projector. The Amazon listing for this model is ASIN B08PMSTLX1.

Sources

Manufacturer:

Independent reviews:

Owner reports:

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