A monitor light bar solves a specific home office problem: the desk in front of the screen is dim, the room is dimmer, and there is no space for a lamp. The bar clamps to the top of the monitor and throws light down and forward at a steep angle, so it lands on the keyboard and papers rather than bouncing off the display or shining into your eyes. Done well, it is the cheapest change that makes long evenings at a screen feel less tiring.
We compared five bars that Amazon stocks: four from BenQ, which makes the category's reference models, and one Quntis bar built for curved and oddly shaped monitors. We ranked them on published illuminance and coverage, color rendering, how wide a range of monitors the clamp fits (thickness and curvature), whether there is a backlight, and how each is powered. We did not test them ourselves, and where a figure is not published we say so.
How we research. We compare published specifications, manufacturer documentation and the details on each listing. We have not tested these products ourselves. Prices come from Amazon and were checked on the date above; they change often. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Our method · Disclosure
Quick answer
The short answer
The ScreenBar Pro is the better buy; the Halo 2 adds a backlight and a dial
BenQ publishes the same front-light performance for the ScreenBar Pro ($139 on November 14, 2026) and the ScreenBar Halo 2 ($199 on November 14, 2026): over 1,000 lux at the center from 50 cm and 500 lux across an 85 x 50 cm area, with CRI of 95 or higher. The Halo 2 adds a rear backlight and a wireless dial. If you work in a dark room in the evening, the backlight is worth it. If not, the Pro gives you the same desk light for less.
Running two monitors side by side? A bar on one screen leaves the other side of the desk dim. The ScreenBar Max ($289 on November 14, 2026) clamps to the desk instead, with a 33-inch head made for dual setups.
What matters in a monitor light bar
Every light bar claims to be glare-free. The differences that matter in daily use are how much desk it lights, whether the clamp fits your particular monitor, and whether it keeps the room behind the screen from going completely dark.
- Asymmetric optics. A good bar shapes the beam so it falls steeply onto the desk and cuts off before the screen and your eyes. BenQ calls this ASYM-Light; the Halo 2 listing gives an 18 degree anti-glare angle, the Max a 36 degree cutoff, and Quntis a 45 degree angled design. A plain LED strip without this optic will reflect off a glossy screen.
- Lux and coverage. Look for illuminance at a stated height and the area kept at 500 lux, the level commonly used for reading and typing. The original ScreenBar covers 60 x 30 cm; the Pro and Halo 2 cover 85 x 50 cm, enough for a keyboard, mouse and a notebook.
- Clamp range and curvature. This is where most returns come from. Check your monitor's top-edge thickness and, for curved screens, its curvature (1000R is tighter than 1800R). The original ScreenBar fits 1–3 cm and curves of 1500R or flatter; the Pro fits 0.43–6.5 cm and 1000R–1800R. Monitors with a bulging back or a camera bump need the newer clamp designs.
- Backlight. A rear light washes the wall behind the monitor and reduces the contrast between a bright screen and a dark room. It matters most for evening work and least in a bright room.
- Power source. Bars draw from a USB port. The original ScreenBar uses USB-A at up to 5W, which most monitor ports can supply. The Pro and Halo 2 use USB-C at up to 8.5W and 15W; a weak monitor port may not be enough, which is why the Pro includes an adapter.
- Webcam. A light bar sits where many people mount a webcam. BenQ sells an optional webcam accessory for the Pro and Halo 2, and the Pro's listing says its clamp does not block the camera lens.
Our picks
Ranked on published front-light performance, clamp compatibility and features, then on value.
BenQ ScreenBar Halo 2
$199 · sold by BenQ INFTY Lab
The Halo 2 pairs BenQ's strongest published front light (over 1,000 lux at 50 cm, 500 lux across 85 x 50 cm) with an adjustable backlight and a wireless dial that shows exact brightness and color temperature values. Its clamp fits monitors 0.43–6 cm thick, flat or curved from 1000R to 1800R, and the listing gives 2700K to 6500K.
- Center illuminance over 1,000 lux at 50 cm (BenQ spec)
- 500 lux across 85 x 50 cm (BenQ spec)
- 2700K–6500K, stepless brightness (per listing)
- CRI Ra 95 or higher on the front light (BenQ spec)
- Rear backlight plus wireless dial controller (per listing)
- USB-C power, max 15W; fits monitors 0.43–6 cm thick, flat or 1000R–1800R curved (BenQ spec, listing)
- You work into the evening in a dim room and want the backlight to soften the screen's glow
- You want to adjust light from a dial on the desk rather than buttons on the bar
- Your monitor is curved or has a thick top edge
- Your room is bright: the backlight is the main thing you pay extra for
- Your monitor's USB-C port is weak; BenQ lists up to 15W draw
In stock on Amazon
BenQ ScreenBar Pro
$139 · sold by BenQ INFTY Lab
The ScreenBar Pro has the same published front-light figures as the Halo 2 and the widest clamp range here (0.43–6.5 cm, 1000R–1800R), and adds an ultrasonic sensor that turns it on when you sit down and off after five minutes away. It drops the backlight and the wireless dial. For most desks, that is the right trade.
- Center illuminance over 1,000 lux at 50 cm (BenQ spec)
- 500 lux across 85 x 50 cm (BenQ spec)
- CRI Ra 95 or higher (BenQ spec)
- Ultrasonic presence sensor, turns off after 5 minutes away (per listing)
- USB-C power, max 8.5W; adapter included (BenQ spec, listing)
- Fits monitors 0.43–6.5 cm thick, flat or 1000R–1800R curved (BenQ spec, listing)
- You want the best published desk light for the money
- You like a light that switches itself on and off as you come and go
- Your monitor has an unusual back or a non-flat top bezel
- You work late in a dark room and want a backlight
- You prefer a desktop control to buttons on the bar
In stock on Amazon
BenQ ScreenBar Max Dual Monitor Desk Lamp
$289 · sold by Amazon.com
The ScreenBar Max is technically a desk lamp: it clamps to the desk edge and holds a 33-inch light head above two monitors, so the gap between screens is lit as well as each side. It has a backlight, auto-dimming and a presence sensor, and three height settings. BenQ's US site has no spec page for it yet, so we rely on the listing.
- 33-inch light head built for dual monitor setups (per listing)
- Asymmetric optics with a 36 degree cutoff angle (per listing)
- Ambient backlight (per listing)
- Auto-dimming and presence sensor (per listing)
- Desk clamp for desks up to 6 cm thick; three height settings (per listing)
- You run two monitors side by side and a single bar leaves half the desk dim
- Your monitors are too thin or too curved for a top-mounted clamp
- Your desk is thicker than 6 cm or made of glass; the listing says you need a separate base
- You want published lux and CRI figures; the listing does not give them
In stock on Amazon
BenQ ScreenBar
$109 · sold by BenQ INFTY Lab
The original ScreenBar still delivers what most people need on a single flat monitor: 930 lux at the center from 45 cm, 500 lux across 60 x 30 cm, CRI of 95 or higher and an auto-dimming sensor, powered from an ordinary USB-A port at up to 5W.
- Center illuminance 930 lux at 45 cm (BenQ spec)
- 500 lux across 60 x 30 cm (BenQ spec)
- 2700K–6500K with auto-dimming (per listing)
- CRI Ra 95 or higher (BenQ spec)
- USB-A power, max 5W (BenQ spec)
- Fits monitors 1–3 cm thick; curved 1500R and flatter (BenQ spec, listing)
- You have one flat monitor with a top edge 1–3 cm thick
- You want to power it from a USB-A port on the monitor or dock
- Your monitor is thinner than 1 cm, thicker than 3 cm, or more curved than 1500R
- You use a large mouse area or paper to one side; coverage is narrower than the Pro's
In stock on Amazon
Quntis Monitor Light Bar with Remote Control
$69.99 · sold by ALPINE US
Quntis uses a three-part weighted clamp that the listing says fits 17–32 inch flat and curved monitors from 0.12 to 3.94 inches thick, the broadest stated range here. It lists 1,200 lux or more, CRI 95, 3000K to 6500K and a desktop remote dial with auto-dimming.
- 20.1-inch (51 cm) bar (per listing)
- 3000K–6500K, CRI 95, stepless dimming (per listing)
- 1,200 lux or more (per listing)
- 45 degree asymmetric optics (per listing)
- Weighted clamp for 17–32 inch flat or curved monitors 0.12–3.94 inches thick (per listing)
- USB power, desktop remote dial (per listing)
- Your curved or oddly shaped monitor will not take a BenQ clamp
- You want a desktop dial without paying for the Halo 2
- You want coverage figures at a stated height; Quntis does not publish them
- Your monitor is larger than 32 inches
In stock on Amazon
The picks side by side
Values from BenQ's spec pages and the Amazon listings. Where nothing is published, we say so.
| Specification | | | | | |
|---|---|---|---|---|---|
| Mounts on | Monitor | Monitor | Desk edge | Monitor | Monitor |
| Center illuminance | Over 1,000 lux at 50 cm | Over 1,000 lux at 50 cm | Not published | 930 lux at 45 cm | 1,200 lux or more |
| Area at 500 lux | 85 x 50 cm | 85 x 50 cm | 33-inch head | 60 x 30 cm | Not published |
| CRI | 95 or higher | 95 or higher | Not published | 95 or higher | 95 |
| Monitor thickness | 0.43–6 cm | 0.43–6.5 cm | Desk up to 6 cm | 1–3 cm | 0.12–3.94 in |
| Curved monitors | 1000R–1800R | 1000R–1800R | Not applicable | 1500R and flatter | Yes (curvature not stated) |
| Backlight | Yes | No | Yes | No | No |
| Power | USB-C, max 15W | USB-C, max 8.5W, adapter included | Not published | USB-A, max 5W | USB |
| Controls | Wireless dial | Buttons on bar | Not published | Touch on bar | Remote dial |
| Price | $199 | $139 | $289 | $109 | $69.99 |
| Buy | View on Amazon | View on Amazon | View on Amazon | View on Amazon | View on Amazon |
How to choose
Measure your monitor's top edge
Measure the thickness of the top edge where the clamp will sit, front to back, and note the curvature on the spec sheet. Then match it against the clamp ranges in the table above before anything else.
Check the USB port
A monitor's USB port may only supply power while the monitor is on, which suits a light bar. For USB-C bars, check the port can deliver enough power, or plan to use the adapter or a charger.
Decide about the backlight by the hour you work
If you finish by early evening in a room with daylight, skip the backlight. If you often work after dark, a backlight reduces the contrast between screen and wall and is the main reason to choose the Halo 2.
Two monitors need a different answer
A bar on one monitor lights the desk in front of that monitor. For a pair, use a desk-mounted bar like the ScreenBar Max, or a lamp with a wide head; see the best desk lamps.
Big monitors sit further back
On a 32-inch or larger screen pushed to the back of a deep desk, the bar sits higher and further from the keyboard, so coverage at your hands drops. See what size monitor suits your desk depth for the geometry.
Who should skip these
If you read and write on paper for long stretches, a light bar's coverage is narrow for the job. A desk lamp with a wide head lights more of the desk and can be positioned to one side.
If your monitor has a thin bezel with a webcam built into the top edge, check whether the clamp will cover the camera. BenQ's Pro and Halo 2 are designed around this; many generic bars are not.
We left out the BenQ ScreenBar Plus and the original ScreenBar Halo because, at the time of writing, Amazon only had them from third-party sellers. We also left out the Xiaomi Mi Computer Monitor Light Bar, which Amazon currently offers only through a third-party importer.
Common questions
What is the best monitor light bar?
The BenQ ScreenBar Halo 2 ($199 on November 14, 2026) is the most complete, with BenQ's strongest published front light, a backlight and a wireless dial. The ScreenBar Pro ($139 on November 14, 2026) has the same published front-light figures without the backlight, and is the better value for most desks.
Do monitor light bars cause glare on the screen?
A well-designed bar should not. Asymmetric optics throw the light down and forward, so it lands on the desk and cuts off before the screen. A bar without that optic can reflect off a glossy display.
Will a monitor light bar fit a curved monitor?
Many will, within a stated range. BenQ lists the ScreenBar Pro and Halo 2 for curves from 1000R to 1800R; the original ScreenBar fits 1500R and flatter. Quntis lists its bar for flat and curved monitors from 17 to 32 inches.
Is a monitor light bar better than a desk lamp?
It is better when desk space is short and you mainly need light on the keyboard. A desk lamp lights a wider area, suits paper work better, and can be placed to one side to avoid shadows.
Can I power a light bar from my monitor's USB port?
Usually. The original ScreenBar draws up to 5W over USB-A. The ScreenBar Pro draws up to 8.5W and the Halo 2 up to 15W over USB-C, so check the port's output or use an adapter.
Sources
Specifications are taken from each manufacturer or listing, not from our own testing. Where a number is marked “Not published”, we could not confirm it from the manufacturer. Recommended viewing distances are calculated, as explained in how we research.