A monitor light bar is one of those desk accessories you don’t realize you need until you try one. Instead of a desk lamp that creates glare on your screen and takes up valuable desk space, a light bar clips onto the top of your monitor and illuminates your keyboard and desk area without any screen reflection.

As an optometrist, I’m a strong advocate for proper desk lighting. Poor ambient lighting forces your pupils to constantly adjust between a bright screen and a dark desk, which accelerates eye fatigue and contributes to digital eye strain. A monitor light bar eliminates that contrast difference — and that alone makes it one of the highest-impact, lowest-cost ergonomic upgrades you can make.

The two most commonly compared options are the BenQ ScreenBar Halo ($180 CAD) and the Xiaomi Mi Monitor Light Bar ($90 CAD). One costs twice as much as the other. Let’s see if it’s worth it.

Affiliate disclosure: This post contains affiliate links. If you make a purchase through these links, we may earn a commission at no extra cost to you.

Quick Comparison

Build Quality & Design

Both light bars use aluminum alloy construction and feel premium in the hand. Neither looks cheap, and both mount on your monitor’s top bezel via a weighted clip that uses gravity rather than adhesive.

The BenQ ScreenBar Halo is slightly longer (50 cm vs 44.5 cm), which provides broader light coverage. Its standout design feature is the rear backlight — a set of LEDs that project a soft ambient glow onto the wall behind your monitor. This reduces the harsh contrast between a bright screen and a dark wall, which is genuinely meaningful for eye comfort during evening work sessions.

The Xiaomi bar is slimmer (0.9" thick vs 1.2" for BenQ) and arguably sleeker. It has a clean, minimal aesthetic that looks right at home in a modern desk setup.

Edge: BenQ for the backlight feature. Xiaomi for slim aesthetics.

Lighting Performance

Here’s where the price difference starts to justify itself.

Brightness

The BenQ reaches 800 lux at 45 cm, while the Xiaomi maxes out around 500 lux. For most desk work (reading documents, looking at your keyboard), both are more than adequate. You’ll rarely need either at maximum brightness.

But the extra headroom matters if your office has high ambient light (sunny room with windows) — the BenQ can overpower ambient light better while maintaining a comfortable level.

Asymmetric Light Distribution

Both bars use asymmetric optics to direct light downward onto your desk rather than forward onto your screen. In practice, neither produces noticeable screen glare — which is the entire point.

The BenQ’s implementation is slightly more refined. I’ve seen occasional minor glare from the Xiaomi bar on curved monitors when the mounting angle isn’t perfectly dialed in. On flat monitors, both are glare-free.

Color Temperature

Both offer the same 2700K–6500K range, covering warm (candlelight) to cool (daylight). For eye health, I recommend:

• Daytime work: 4000K–5000K (neutral, simulates natural light)
• Evening work (after 7 PM): 2700K–3500K (warm, reduces blue light impact on sleep)
• Colour-critical work (photo/video editing): 5000K–5500K

Edge: BenQ for brightness headroom and backlight. Both tie on color temperature range.

Controls & Auto-Dimming

The BenQ ScreenBar Halo comes with a wireless puck controller — a small, round dial that sits on your desk. Rotate it to adjust brightness, touch the top to toggle between front light and backlight. It’s tactile, intuitive, and doesn’t require looking away from your screen.

The Halo also has an auto-dimming sensor that reads ambient light and adjusts brightness automatically. Press the button, and the bar finds the right level for current conditions. After using this feature for a week, you’ll wonder why every light doesn’t work this way.

The Xiaomi uses physical touch controls directly on the light bar. You tap the bar to switch modes and rotate a touch-sensitive dial on the bar’s right end to adjust brightness. It works fine, but reaching up to the top of your monitor every time you want to change brightness is less convenient than the BenQ’s desk-level puck.

Xiaomi has no auto-dimming — you set it manually and leave it.

Edge: BenQ, clearly. The wireless puck and auto-dimming are the features you’re paying for.

Eye Health Impact — The Optometrist’s Take

Both of these light bars will significantly reduce digital eye strain compared to working with no desk lighting or a traditional desk lamp. Here’s why:

Reduced luminance contrast: Without a desk light, there’s a massive brightness difference between your monitor and the surrounding desk area. Your pupils are constantly oscillating between constricted (looking at screen) and dilated (looking at keyboard or desk). This oscillation causes fatigue. A light bar illuminates your desk to closer to your screen’s brightness, reducing the work your pupils have to do.

No screen glare: Traditional desk lamps create reflections on your monitor, forcing you to squint or adjust position. Both these light bars eliminate that problem entirely with asymmetric optics.

The BenQ’s backlight advantage: The rear ambient light reduces the brightness difference between your monitor and the wall behind it — the same principle behind Philips Ambilight TVs. This peripheral brightness matters for eye comfort, especially during evening sessions in otherwise dark rooms.

Color temperature flexibility: Being able to shift to warm tones in the evening reduces blue light exposure, which helps with melatonin production and sleep quality. Both bars support this, but BenQ’s auto-dimming makes it more likely you’ll actually use the feature consistently.

If I had to quantify it: both bars reduce eye strain meaningfully. The BenQ’s backlight and auto-dimming provide an extra 10–15% improvement in my estimation — genuine, but incremental.

Who Should Buy Which?

Get the BenQ ScreenBar Halo if:

• You work long hours at your desk (8+ hours/day)
• You often work in the evening in a dark room
• You value automatic brightness adjustment (set and forget)
• You use a curved monitor (BenQ’s mounting is slightly more compatible)
• You’re willing to pay for the best eye comfort experience
• The wireless puck appeals to you

Get the Xiaomi Monitor Light Bar if:

• You want a significant eye comfort upgrade at a fair price
• Your room has consistent lighting (auto-dimming less critical)
• You prefer a slimmer, more minimal look
• You’re comfortable with manual brightness adjustments
• $90 feels right; $180 doesn’t

The Budget Alternative: Quntis

If even the Xiaomi feels expensive, the Quntis Monitor Light Bar (~$40–50 CAD) is a legitimate entry-level option. It lacks the build quality of both the BenQ and Xiaomi, but it produces usable asymmetric light and includes basic touch controls. For the price, it’s hard to complain.

Our Verdict

The BenQ ScreenBar Halo is the better product. The backlight, auto-dimming, and wireless puck controller make it a “buy once, use forever” desk accessory. If you spend your workdays at a desk, $180 for years of reduced eye strain is easy to justify.

The Xiaomi Monitor Light Bar is the smarter buy for most people. It delivers 85% of the BenQ’s eye-comfort benefits at 50% of the price. The missing features (backlight, auto-dimming, wireless control) are nice-to-haves, not must-haves.

Either way, you’re making one of the best sub-$200 upgrades for your desk setup and your eyes. Your ophthalmologist will approve.