Click Start Lighting Test to run a webcam lighting test on your live camera feed. The tool measures overall brightness, lighting uniformity, and exposure quality — then scores your setup as Excellent, Good, Average, or Poor with specific tips to improve. Use alongside the brightness test for a detailed exposure check. Open the webcam viewer to see your camera's full technical specs in one detailed panel.
Lighting Scores
Common Issues
Ideal Setup
The webcam lighting test measures three aspects of your lighting in real time: overall brightness, spatial uniformity, and a combined quality score. No setup required — just click Start and the analysis runs automatically every second.
Allow camera access. The live feed appears and the tool immediately starts measuring your lighting. Scores update every second.
Brightness shows whether the overall frame is well-lit. Uniformity reveals how evenly distributed the light is — shadows and hotspots both lower this score.
The assessment card shows your overall lighting grade and a specific improvement tip based on which metric is pulling your score down.
Move a lamp, open a blind, or change your position. The scores update every second so you can dial in the best lighting configuration in real time.
The tool divides your camera frame into a 3x3 grid of nine zones and analyses each zone independently. This approach catches problems that a simple average would miss — such as a bright hotspot on one side while the rest of the frame is dark. Use the webcam grid overlay to add a rule-of-thirds grid, crosshair, or face guide to your live camera feed.
The brightness score is calculated from the overall average luminance of all nine zones. The optimal luminance range corresponds to a score of 40–70 on a 0–100 scale — enough light to suppress sensor noise and maintain frame rate, but not so bright that highlights are blown out. Very dark rooms (below 20) and overlit setups (above 85) both produce lower scores.
Uniformity measures how evenly the light is spread across your frame. The tool calculates the standard deviation of the nine zone luminances — a high standard deviation means some zones are much brighter or darker than others, indicating harsh shadows, a strong backlight, or a single side-light source. A score of 80+ means the light is spread relatively evenly, which is the ideal for video calls.
The overall quality score is the average of the brightness and uniformity scores, clamped between 0 and 100. Because both dimensions are equally weighted, a setup with great brightness but very uneven distribution will score around 60 — reflecting that while you have enough light, the placement needs improvement. Aim for 80+ on both individual metrics to achieve the best overall score.
Different environments produce predictably different results in the lighting test. Understanding which pattern matches your current setup helps you identify the fastest path to improvement.
This is the most common poor-lighting scenario. The window creates a strong backlight that makes the background very bright while your face appears as a dark silhouette. Brightness score may appear adequate (because the window is bright), but uniformity will be very low due to the extreme contrast between the lit background and the dark foreground zone. Fix: turn your desk so you face the window instead of having your back to it.
Working in a dim room with only ambient ceiling light typically produces a low brightness score and moderate uniformity. The camera compensates with a slow shutter and high gain, increasing noise. Both brightness and uniformity scores will be below 40 in most cases. Fix: add a desk lamp or ring light positioned in front of you. Even a single 40W equivalent LED bulb at 5000K makes a significant difference.
A lamp placed directly to one side creates a half-lit face — one cheek bright, the other in deep shadow. This produces a moderate brightness score but very low uniformity, because the left and right zones differ dramatically. Fix: add a second, softer fill light on the opposite side, or move the existing light to a more frontal position (45 degrees from the camera axis rather than 90 degrees).
A ring light positioned directly in front of you at eye level typically produces the best scores of any common setup. The circular design provides even illumination from all sides simultaneously, eliminating directional shadows. Brightness will be in the optimal range and uniformity will be high. Most ring lights at medium intensity (50–70%) produce an overall lighting score of 75–90 in this test.
The most counterintuitive truth about webcam quality is that lighting consistently has a larger impact on how you appear than the camera itself. A basic 720p webcam in excellent lighting will produce better results on a video call than a 4K professional webcam in a dark room. The webcam lighting test exists precisely because most quality problems that users attribute to their cameras are actually lighting problems in disguise.
Here is why lighting dominates camera quality on video calls:
Both natural and artificial light can produce excellent results in the webcam lighting test, but each has distinct advantages and limitations for webcam use: Use the webcam zoom test to preview digital zoom levels from 1× to 5× on your live camera feed.
Natural window light is free, has excellent colour rendering (high CRI), and looks flattering when positioned correctly. The right position is directly in front of you — sit facing a window so that the light source illuminates your face rather than backlighting you. The main disadvantage of natural light is variability: cloud cover, time of day, and season all affect brightness and colour temperature. Your webcam lighting test score may be excellent at 10am and poor at 4pm in winter if you rely entirely on window light.
Artificial light sources give you full control over brightness, colour temperature, and position regardless of time of day or weather. A ring light or LED panel rated at 5000–6500K provides consistent, repeatable lighting conditions that produce the same high scores in the lighting test every session. The disadvantage is cost and setup — quality ring lights range from £30 to £150, and positioning matters: too close or too bright creates overexposure and clips highlights.
Ring lights are the most popular dedicated webcam lighting solution because they produce soft, even light from a 360-degree source. When positioned at eye level with the camera in the centre, they eliminate the directional shadows that single desk lamps create. Start at 50% brightness and use the webcam lighting test to dial in the exact level that puts your brightness score in the 50–65 range without overexposing.
Professional video setups use three lights: a key light (your main source, typically 45 degrees to one side), a fill light (softer, on the opposite side to reduce shadow depth), and an optional back light (behind you, slightly above, to create separation between you and the background). This setup produces the highest combined brightness and uniformity scores in the lighting test, and is the standard for professional video production and high-end streaming setups.