Complete Feature Guide

Color Control

Color is the foundation of any lighting setup, and Screen Light Studio gives you four independent, synchronized methods for selecting the exact shade you need. Every input method updates the screen in real time, so you always see the result of your adjustment instantly. Whether you prefer the visual intuition of a color wheel, the precision of numerical codes, or the creative flexibility of hue-saturation-lightness sliders, the tool adapts to your workflow. All four inputs are kept in perfect sync — changing a value in one automatically updates the other three.

Native Color Picker

The native color picker leverages your browser’s built-in color selection dialog, giving you immediate access to the full visible spectrum through an intuitive hue-saturation square and a brightness slider. This is the fastest way to pick a color because it requires zero typing and zero memorization of codes. Simply click, drag, and your screen changes color in real time. Because it uses the operating system’s native widget, it feels instantly familiar on Windows, macOS, and Linux alike. The picker supports all 16.7 million colors in the sRGB gamut, ensuring that every conceivable shade — from the deepest blacks to the most vivid neons — is available at your fingertips. For photographers who think visually, this is the most natural starting point.

HEX Color Input

HEX color codes follow the #RRGGBB format, where each pair of hexadecimal digits represents the red, green, and blue channels on a scale from 00 to FF (0 to 255 in decimal). Professional designers and photographers use HEX codes because they are universally supported across every design tool, from Figma and Adobe Photoshop to CSS editors and lighting consoles. Screen Light Studio lets you paste any HEX code directly into the input field, and the screen updates the instant you type the sixth character. The tool performs real-time validation, highlighting the input border in amber when a valid six-digit code is detected and resetting gracefully if you clear the field. This makes it trivial to match your on-screen light to brand colors, mood-board swatches, or specific gel references pulled from professional lighting resources.

RGB Sliders

The RGB (Red, Green, Blue) sliders give you direct, numerical control over each of the three additive color channels that make up every pixel on your screen. Each slider spans from 0 to 255, where 0 means that channel is fully off and 255 means it is at maximum intensity. By mixing these three channels in different proportions, you can produce any color in the sRGB gamut. For example, pure red is (255, 0, 0), pure green is (0, 255, 0), and an even mix of all three at maximum — (255, 255, 255) — produces white. This level of direct channel control matters for precise color matching because it lets you fine-tune individual wavelengths without the rounding errors that can occur with HSL conversions. Photographers who are accustomed to working with RGB values in post-production software will find this input method particularly comfortable and efficient.

HSL Sliders

The HSL (Hue, Saturation, Lightness) model provides a more perceptually uniform way to think about color compared to raw RGB values. The Hue slider rotates through 360 degrees of the color wheel, from 0° (red) through 60° (yellow), 120° (green), 180° (cyan), 240° (blue), 300° (magenta), and back to 360° (red). Saturation controls the intensity of the color from 0% (completely desaturated / gray) to 100% (fully vivid). Lightness adjusts how bright or dark the color appears, from 0% (pure black) through 50% (the pure hue at full intensity) to 100% (pure white). HSL is often more intuitive than RGB for creative tasks: finding a complementary color is as simple as adding 180° to the hue, creating pastels means reducing saturation while increasing lightness, and boosting vibrancy is a single saturation adjustment. Screen Light Studio converts your HSL values to RGB under the hood, so the screen always receives the correct signal regardless of which input method you use.

14 Color Presets

Not every session calls for a custom-mixed color. Screen Light Studio includes 14 carefully curated color presets organized into three categories — Neutrals, Primary Colors, and Creative Colors — so you can set up professional lighting in a single click. Each preset has been chosen for its practical utility in real-world photography and video production. Click any preset and the screen instantly switches to that color, with all four input methods updating to reflect the new value.

Neutrals

The four neutral presets cover the most common white-balance reference points used in photography. White (#FFFFFF) is a pure 6500K daylight white, ideal for general fill light and product photography. Warm White approximates a 3200K tungsten equivalent, mimicking the golden glow of incandescent bulbs and perfect for matching indoor ambient light or creating a cozy, intimate atmosphere. Neutral White sits around 4500K, offering a balanced tone that works well in mixed-lighting environments. Cool White simulates a 6500K overcast-sky reference, useful for filling shadows with blue-tinted light that mimics open shade. These four presets alone cover the vast majority of everyday lighting needs.

Primary Colors

The three primary color presets — Red, Green, and Blue — deliver pure, fully saturated additive primaries. These are the same colors produced by theatrical lighting gels and RGB LED panels. Photographers use pure primaries to create bold, graphic color contrasts, simulate gel effects without physical gels, and build tri-color setups for creative portraiture and music video production. Because they map directly to the red, green, and blue subpixels of your display, they produce the most intense, saturated light your screen is capable of emitting.

Creative Colors

The seven creative presets — Cyan, Purple, Pink, Orange, Yellow, Magenta, and Teal — open up a world of stylized lighting possibilities. Cyan is a staple for cyberpunk and sci-fi aesthetics, while Purple and Magenta create dramatic, moody atmospheres popular in fashion and editorial photography. Pink adds a dreamy, editorial quality to portraits and beauty shots. Orange and Yellow simulate warm golden-hour and sunset light, and Teal provides a cool, cinematic contrast that pairs beautifully with warm skin tones. Each of these presets has been fine-tuned to a saturation and lightness level that reads well as actual illumination rather than a flat screen color.

10 Animation Effects

Static light is powerful, but animated light adds movement, energy, and emotion that a fixed color simply cannot achieve. Screen Light Studio includes ten distinct animation modes, each engineered for a specific creative purpose. Every animation runs entirely in the browser using optimized JavaScript — no plugins, no external libraries, and no performance overhead. Switch between effects instantly and watch the screen respond in real time. For a deeper look at practical applications, see our Use Cases page.

1. Static

   Solid, unchanging color is the default mode and the workhorse of most photography lighting. When you select Static, the screen holds your chosen color at a constant, flicker-free output for as long as you need it. This mode provides the most consistent and predictable illumination, making it ideal for portrait sessions, product photography, and any scenario where you need reliable, repeatable lighting. Because there is no animation overhead, Static mode delivers the absolute maximum brightness your display can produce.

2. Slow Pulse

   Slow Pulse creates a gentle, breathing-cycle animation that smoothly ramps the brightness up and down over a two-second period. The effect is subtle and organic, evoking the rhythm of relaxed breathing. This makes it an excellent choice for ambient mood lighting during portrait sessions where you want to add a touch of life to the background without distracting from the subject. It also works beautifully as atmospheric fill light for lifestyle and wellness content, creating a calm, meditative quality that static light cannot replicate.

3. Fast Pulse

   Fast Pulse accelerates the breathing cycle to a rapid half-second oscillation, producing a stroboscopic effect that adds high-energy movement to your frame. This mode is particularly effective for music videos, dance photography, and concert-style shoots where the pulsing light creates a sense of rhythm and urgency. The rapid on-off cycle can also freeze motion in interesting ways when synchronized with your camera’s shutter speed. Use it sparingly — a little goes a long way — but when the moment calls for intensity, Fast Pulse delivers.

4. Fade In/Out

   Fade In/Out produces a smooth, four-second fade cycle that gradually transitions the screen from full brightness to black and back again. Unlike Pulse, which modulates brightness within a color, Fade In/Out transitions through the full luminance range, creating a more dramatic and cinematic shift. This effect is perfect for transitions in video production, where you want the lighting to naturally rise and fall as a scene begins or ends. It can also be used to simulate stage lighting cues or to create a dreamy, fading atmosphere for editorial and fashion work.

5. Rainbow Cycle

   Rainbow Cycle continuously rotates through the entire hue spectrum at a rate of approximately 60 degrees per second, completing a full 360-degree loop every six seconds. The result is a smooth, mesmerizing flow of color that transforms your screen into an ever-changing light source. This effect is a go-to for creative backgrounds in product photography, party and event scenes, social media content, and eye-catching product showcases. Because the hue changes continuously, no two frames are ever exactly the same, which adds visual interest and movement to both photos and video recordings.

6. Police Red/Blue

   Police Red/Blue alternates between vivid red and vivid blue at half-second intervals, creating the instantly recognizable flash pattern of emergency vehicle lighting. This dramatic effect is widely used in action photography, music videos, and theatrical productions to inject tension, urgency, and cinematic drama into a scene. The hard alternation between two highly contrasting colors produces strong, directional color shifts that can create striking split-lighting effects on a subject’s face, with warm red on one side and cool blue on the other.

7. Candle Flicker

   Candle Flicker simulates the warm, organic light of a real candle using multiple layered sine waves with slightly different frequencies and amplitudes. The result is a natural-looking, non-repetitive flicker that rises and falls unpredictably, just like a real flame dancing in a slight draft. This effect is perfect for intimate portraits, restaurant and bistro scenes, romantic settings, and any low-light cinematography where you need the warmth and life of firelight without the safety concerns or inconsistency of actual candles. The warm color temperature pairs naturally with the flicker pattern for a convincing candlelight simulation.

8. Lightning Flash

   Lightning Flash keeps the screen dark for several seconds at a time, then triggers sudden, intense bright flashes using a pseudo-random timing algorithm that ensures the flashes never fall into a predictable pattern. Each flash is brief (under 200 milliseconds) but at full brightness, closely mimicking the visual impact of a real lightning strike. This effect is a powerful tool for creative photography, horror-themed content, dramatic music videos, and any scenario where you want to add a sense of danger, drama, or supernatural atmosphere to your lighting. The unpredictable timing keeps both the subject and the viewer on edge, creating genuine moments of surprise.

9. TV Screen Glow

   TV Screen Glow simulates the cool, shifting blue-toned light that a television or monitor casts across a dark room. The effect uses a subtle, randomized RGB animation that mimics the varying brightness and color temperature changes of actual television content, from deep blues during night scenes to brighter, slightly warmer tones during daytime programming. This is an invaluable tool for interior photography and film scenes where you need to recreate the authentic look and feel of a room illuminated only by a television. It adds realism and depth to nighttime interior shots without requiring an actual TV on set.

10. Fire Effect

    Fire Effect simulates the warm, shifting glow of a real fire by continuously varying between deep reds, bright oranges, and golden yellows using multiple overlapping sine waves at different speeds and phases. The resulting animation is organic and non-repetitive, with the color temperature fluctuating naturally between approximately 1800K and 3500K, just like a real wood fire. This effect is perfect for campfire scenes, cozy interior shots, autumn-themed photography, and any creative work that benefits from the warm, inviting ambiance of firelight. It is an excellent companion to the Candle Flicker mode when you need a larger, more intense flame simulation.

Brightness Control

The brightness slider gives you continuous control over the luminance of your on-screen light source, ranging from 0% (completely black) to 100% (maximum display brightness). Unlike simply lowering your monitor’s backlight, Screen Light Studio’s brightness control works by multiplying each RGB channel value by the selected percentage, so a 50% brightness setting on pure red (255, 0, 0) produces (128, 0, 0) — a darker shade of the same hue rather than a grayed-out version. This preserves color accuracy at every brightness level.

Adjusting the brightness slider updates the screen in real time with zero latency, so you can see the exact effect of your adjustment as you drag. This is particularly useful for matching your screen light to ambient room lighting levels. If you are shooting in a dimly lit room, dialing the brightness down to 15-25% can provide gentle fill light without overpowering the existing atmosphere. Conversely, in a well-lit studio environment, running at 80-100% ensures your screen light competes effectively with other light sources and contributes meaningfully to the overall exposure.

For hands-free operation during a shoot, Screen Light Studio supports keyboard shortcuts. Pressing the Up Arrow key increases brightness by 5%, and the Down Arrow key decreases it by 5%, allowing you to make precise adjustments without moving your mouse or touching the screen. This is invaluable when your screen is positioned behind or beside your subject and reaching the slider physically would disrupt the scene. The current brightness percentage is always visible next to the slider, so you can set a specific value, note it down, and recreate it exactly in a future session.

Brightness control also interacts intelligently with the animation system. When an animation like Slow Pulse or Fade In/Out is active, the brightness slider acts as a ceiling — the animation modulates between 0% and the slider value rather than between 0% and 100%. This means you can set a gentle pulse at 20% brightness for a subtle background effect while keeping the overall light level low enough not to affect your primary lighting setup.

Color Temperature

Color temperature is measured in Kelvin (K) and describes the warmth or coolness of a light source. Screen Light Studio includes a dedicated color temperature slider spanning from 2000K to 10000K, covering the full range of natural and artificial light sources you will encounter in photography and filmmaking. At the warm end (2000K–3000K), the light takes on the deep golden-orange tone of candlelight, sunset, and tungsten bulbs. In the middle range (4000K–5500K), it approximates daylight, fluorescent lighting, and electronic flash. At the cool end (6500K–10000K), the light shifts toward blue-white, simulating overcast skies, open shade, and high-altitude daylight.

Behind the scenes, the Kelvin value is converted to an RGB color using the Tanner Helland algorithm, a widely respected approximation of Planckian locus blackbody radiation that has been validated against CIE standard illuminant data. This scientific approach ensures that the color temperature slider produces physically accurate colors that match real-world light sources, not merely a rough approximation. When you set the slider to 3200K, the resulting color is the same warm tungsten tone that your camera’s white balance system expects when you dial in 3200K. This accuracy makes it straightforward to match your screen light to your camera’s white balance settings for consistent, predictable results.

Color temperature control is fundamentally different from simple color picking. While the RGB and HSL sliders let you choose any color in the gamut, the Kelvin slider constrains your selection to the scientifically defined blackbody curve — the range of colors that actual heated objects emit at different temperatures. This constraint is a feature, not a limitation: it guarantees that your light source will always look natural and physically plausible, which is essential when you are trying to simulate or complement real-world lighting conditions. A photographer lighting a sunset scene can dial in 2500K with confidence, knowing that the resulting warm orange is the same color that the setting sun actually produces.

The color temperature slider syncs bidirectionally with the other color inputs. When you adjust the Kelvin slider, the RGB and HSL values update to reflect the corresponding blackbody color. Conversely, if you use the RGB sliders to select a color that falls near the blackbody curve, the Kelvin slider will move to the closest matching temperature. This seamless integration means you can start with a Kelvin value and then fine-tune it with RGB sliders, or vice versa, without ever losing the relationship between the two.

Transition Smoothing

When you switch between colors — whether by clicking a preset, typing a HEX code, or adjusting the color temperature slider — the transition smoothing control determines how quickly the change happens. The slider ranges from 0 seconds (instant, no transition) to 5 seconds (a slow, cinematic crossfade). At the default 0-second setting, color changes happen immediately, which is ideal for still photography where you need to see the exact result of your selection without any delay.

Transition smoothing becomes essential when you are recording video or capturing long exposures. Abrupt color changes create jarring visual cuts that can ruin the continuity of a shot, especially if the light source is visible in the frame or reflecting off your subject. By setting a transition duration of 1–3 seconds, every color change becomes a smooth, gradual crossfade that looks intentional and professional. This is particularly useful when cycling through presets during a video shoot or when adjusting the color temperature to simulate the gradual shift of natural light from golden hour into blue hour.

The transitions are implemented using CSS transitions on the background-color property, which means they are handled by the browser’s compositor thread for maximum performance. Even on lower-end devices, a 5-second transition runs at a consistent 60 frames per second with zero JavaScript overhead. The result is buttery-smooth color changes that look polished and professional regardless of your hardware. Check out our How to Use guide for step-by-step instructions on configuring transitions.

Timer with Auto-Fade

The built-in timer lets you set an automatic countdown that will gracefully fade the screen to black when the time expires. You can choose from four duration options: 1 minute, 5 minutes, 10 minutes, or infinite (no timer). A live countdown display shows the remaining time in minutes and seconds, updating every second so you always know exactly how long you have left. When the timer reaches zero, the screen performs a smooth two-second fade to black, giving you a gentle visual cue that the session is ending rather than an abrupt cut to darkness.

This feature is incredibly useful for timed portrait sessions where you want to maintain consistent lighting for a fixed period. Set the timer to 5 or 10 minutes, position your screen, start your shoot, and focus entirely on your subject — the light will manage itself. The auto-fade to black also serves as a natural end-of-session signal, letting you and your subject know that the lighting phase is complete without anyone needing to watch a clock or call out time. For group shoots or workshops, the timer ensures fair, equal lighting time for every participant.

The infinite timer mode disables the countdown entirely, keeping the screen lit indefinitely until you manually stop it. This is the default setting for general use and is ideal for extended studio sessions, all-day video shoots, or any situation where you need continuous, reliable light for an unpredictable duration. The timer can be changed at any time during a session without interrupting the current lighting, so you can start in infinite mode, switch to a 5-minute countdown mid-shoot, and then return to infinite when the timed portion is complete.

The auto-fade feature also doubles as a sleep-friendly night light. Set a warm color, activate the 1-minute timer, and place your screen face-down or at a low angle — the gentle warmth will help you wind down, and the automatic fade to black ensures the light turns itself off without you needing to reach for your device in the dark. For more creative applications of the timer, visit our Use Cases page.

Fullscreen Mode

With a single click, Screen Light Studio enters true fullscreen mode using the browser’s Fullscreen API, expanding to cover the entire display and hiding the operating system taskbar, browser chrome, and all other on-screen elements. In fullscreen mode, your screen becomes a pure, edge-to-edge light panel with absolutely no visual distractions. This maximizes the effective light output of your display by eliminating the dark borders and UI elements that reduce the illuminated area in windowed mode.

Once in fullscreen, the mouse cursor automatically hides after three seconds of inactivity, removing the last remaining on-screen element that could reflect in your subject or appear in your frame. Moving the mouse brings the cursor back temporarily, so you retain full control over the interface when you need it. Pressing the Escape key exits fullscreen mode instantly, returning you to the normal browser view. This one-click entry, automatic cursor hiding, and instant exit make fullscreen mode effortless to use during fast-paced shoots where every second counts.

Fullscreen mode is particularly important for video recording and long-exposure photography. Any UI elements visible in the frame — even a small slider or button — can break the illusion of a pure light source and require additional cropping or retouching in post-production. By going fullscreen, you guarantee that the only thing your camera sees is clean, uninterrupted light. Combined with the Wake Lock API (described below), fullscreen mode ensures that your screen stays on, stays bright, and stays clean for as long as you need it.

Wake Lock API

Screen Light Studio uses the browser’s Wake Lock API to prevent your device’s screen from automatically sleeping or dimming while the application is active. This is a critical feature for any extended photography or video session, where an unexpected screen shutdown could interrupt your workflow, ruin a take, or force you to stop and unlock your device in the middle of a shoot. The wake lock is requested automatically when you launch the app and is released when you navigate away, so you never need to think about it.

Because the Wake Lock API can be revoked by the browser under certain conditions (such as low battery or user inactivity), Screen Light Studio includes a visibility-change listener that re-acquires the wake lock whenever the tab becomes visible again. This means that if you switch to another tab briefly to check your camera settings or review a shot and then return to the light tab, the wake lock is silently re-established. For long sessions — wedding receptions, all-day video shoots, time-lapse photography — this automatic recovery ensures uninterrupted light without any manual intervention. Learn more about technical requirements on our FAQ page.

Comparison: Screen Light Studio vs. Physical LED Panels

Screen Light Studio is not designed to replace professional LED panels in every scenario, but it offers a surprisingly competitive feature set for a free, browser-based tool. The table below compares Screen Light Studio with two categories of physical LED panels commonly used by photographers and videographers: budget panels in the $30–$50 range and professional panels in the $150–$300 range.

As the comparison shows, Screen Light Studio matches or exceeds the feature set of panels costing hundreds of dollars in several key areas. Its 2000K–10000K color temperature range is actually wider than most professional panels, which typically top out at 8000K. The ten built-in animation effects rival what you would find on mid-range LED panels, and the ability to use any screen — laptop, tablet, phone, desktop monitor, or even a smart TV — means you effectively have unlimited light sources without buying additional hardware. The instant setup time is a game-changer for spontaneous shoots, location work, and situations where you simply do not have an LED panel with you. While physical panels offer advantages in raw lumen output and battery-powered portability, Screen Light Studio provides an unmatched combination of zero cost, zero setup, and professional-grade features that makes it an essential tool in any photographer or videographer’s toolkit.