Lenovo L27i-4B Monitor Review UK (2026) – Tested & Calibrated

I’ve measured response times that manufacturers claim are “1ms” but actually hover around 6-8ms in practice. I’ve seen IPS glow marketed as “perfect uniformity”. And I’ve tested panels where the HDR badge means absolutely nothing beyond a checkbox on the spec sheet. When Lenovo sent over the L27i-4B for testing, I wasn’t expecting miracles at this price point. But what I needed to know was simple: does it do what it claims without the usual budget panel compromises that make you regret the purchase three weeks in?

But here’s the thing. For office work, web browsing, and watching videos, it’s perfectly usable. I spent several weeks using this as my primary work display, and after the first day, I stopped noticing the pixel structure. Your brain adapts. If you’re coming from a 24-inch 1080p monitor, the extra screen real estate for having multiple windows open side-by-side is genuinely useful.

The 100Hz refresh rate is a nice touch at this price point. It’s not a gaming-focused 144Hz or 165Hz, but it’s enough to make mouse cursor movements and scrolling feel noticeably smoother than a standard 60Hz office monitor. Windows feel more responsive when you drag them around. It’s one of those things you don’t think you need until you try it.

The viewing angles are properly good. I can sit off to the side or stand above the monitor and colours don’t shift to that washed-out grey you get with TN panels. This matters if you share your screen with colleagues during meetings or if you don’t sit perfectly centred at your desk.

Colour reproduction is solid for the price bracket. Lenovo claims 99% sRGB coverage, and my colorimeter measurements backed that up (98.7% sRGB coverage, 103% volume). Out of the box, colours look natural enough for general use. Reds are properly red, blues don’t skew purple, and skin tones in video calls look normal rather than jaundiced.

The contrast ratio is where IPS shows its limitations. I measured around 980:1, which is typical for this panel type. Dark scenes in films or games look more grey than black, especially in a dim room. There’s also visible IPS glow in the corners when viewing dark content. This isn’t a defect – it’s just how IPS works. If you want deep blacks, you need a VA panel or OLED, and those cost considerably more.

The 4ms claim is optimistic. Real-world grey-to-grey transitions average 5-7ms, which is standard for budget IPS. You’ll see some ghosting in fast-paced games like Call of Duty or Apex Legends, but it’s not egregious. For single-player RPGs, strategy games, or office work, it’s completely fine.

Let’s be honest about what this monitor can and can’t do for gaming. The 100Hz refresh rate is a step up from 60Hz, and you’ll notice the difference in smoothness. But the response time isn’t fast enough for competitive gaming. Playing Valorant or CS2, I could see ghosting on fast camera pans. It’s not a dealbreaker for casual play, but if you’re trying to rank up in competitive shooters, you want a proper gaming monitor with sub-3ms response times.

The input lag measured at around 12ms, which is perfectly acceptable. I didn’t notice any delay between mouse movements and on-screen action. For console gaming at 60fps or less demanding PC titles, this is more than adequate.

There’s no HDR here, and honestly, that’s fine. Budget monitors that claim HDR400 support are usually worse than proper SDR displays because they lack the brightness and local dimming to make HDR look good. Lenovo made the right call skipping the HDR checkbox feature.

The colour accuracy is the monitor’s strongest point. After calibration, I got the Delta E average down to 1.9, which is excellent. But out of the box, it sits at 2.8, which is still acceptable for non-professional use. If you’re editing photos for print or doing colour-critical work, you’ll want to calibrate it properly. For everyone else, it’s fine as-is.

The AMD FreeSync implementation works well within its range. I didn’t experience any screen tearing when playing games that hovered between 50-90fps. Below 48fps, you’re outside the VRR range and you’ll get judder, but that’s expected.

Console gamers should know that while this monitor accepts a 1080p 120Hz signal via HDMI, it only displays at 100Hz maximum. Your PS5 or Xbox Series X will run at 100Hz, not 120Hz. For most games that target 60fps anyway, this doesn’t matter.

The build quality is what you’d expect at this price. Plastic chassis, nothing fancy, but it doesn’t feel like it’ll fall apart. The bezels are slim on three sides with a slightly thicker bottom bezel. The power button is on the bottom right edge, which is a bit awkward to reach.

There are no built-in speakers. You get a 3.5mm audio jack for passing through audio from your HDMI source to external speakers or headphones. This is fine – built-in monitor speakers are usually rubbish anyway.

The Z-Edge 24-inch is cheaper and uses a VA panel, which means better contrast but worse viewing angles. At 24 inches, 1080p looks sharper too. If you don’t need the extra screen size, the Z-Edge is better value.

For gaming specifically, look at the Acer 24-inch 120Hz or the MSI MAG 32C6X if you want a curved VA panel with better response times.

At this price point, the Lenovo L27i-4B delivers exactly what budget buyers need: a large screen with decent colour reproduction and smooth everyday performance. You’re not getting premium features, but you’re also not paying for them.

The value proposition is strongest for home office workers who want a big screen for multitasking. The 27-inch size lets you comfortably fit two documents side-by-side or have a video call open alongside your notes. The IPS panel means colours look natural for presentations and web content.

For casual gaming, it’s adequate but not ideal. The 100Hz refresh rate is nice, but the response time holds it back. If gaming is your primary use case, spend a bit more on a proper gaming monitor with a 144Hz+ refresh rate and sub-3ms response time.

The 1080p resolution at 27 inches is the main compromise you need to accept. If you sit at a typical desk distance (60-70cm), you’ll adapt to the pixel structure within a day or two. But if you’re coming from a high-DPI laptop screen or you do detailed photo editing, the lack of sharpness will bother you. In that case, save up for a 27-inch 1440p monitor or stick with a 24-inch 1080p display.

For the target audience – home office workers on a budget, students needing a large screen for essays and research, casual gamers who play RPGs and strategy games – this Lenovo delivers solid value. Just don’t expect it to compete with dedicated gaming monitors or professional-grade displays costing three times as much.