The Strobe Light effect flips a screen between a solid color and black several times a second, standing in for a physical strobe unit at parties, DJ sets, or on-camera special effects. Point it at a room or a backdrop and it reads as club lighting without any extra hardware.
Before you start
- Confirm no one nearby has photosensitive epilepsy or another flash-triggered condition. Rapid, high-contrast flashing can trigger seizures in people with that sensitivity, even from a screen rather than a physical strobe light. If you don't know everyone who might see it, don't run it.
- Warn the room before you start it, not after. At an event, tell people a strobe effect is coming so anyone who needs to look away or leave can do so before the flashing starts, not mid-song.
- Plan how you'll stop it instantly. Keep the tab or window easy to reach. Pressing Escape exits fullscreen immediately; closing the tab works from anywhere.
- Keep sessions short. Use it for a chorus or a drop, not as background lighting left running for an hour — both for comfort and because sustained full-screen flashing is more likely to bother someone than a few seconds of it.
Set it up
- Open the Strobe Light effect on the screen you want to flash.
- Select Color in the Lighting controls and choose a flash color, or leave it at the default white.
- Select Go Fullscreen to fill the whole screen with the flash.
- Move your mouse if you need the controls back — they fade out after five seconds without movement, same as every other effect.
You'll know it worked when the entire screen is alternating between your chosen color and black several times a second.
To stop, press Escape, or move your mouse and select Exit Fullscreen.
What each control does
| Control | Range | What it changes |
|---|---|---|
| Color | Any color (picker) | The color the screen flashes to. Defaults to white; pick a saturated color for a less harsh, more club-like flash. |
| Brightness | 10–100 | Shown in the Lighting controls, but has no effect on the strobe — the flash renders at full intensity every time regardless of this slider's position. |
There is no control for flash speed. The rate is fixed in the effect's code at roughly five on/off cycles per second, and no slider exposes it.
Common setups
- Classic white flash. Leave Color at its default. This is the most intense option — best for a few seconds at a peak moment, not a whole track.
- Softer club look. Set Color to a saturated blue, purple, or red instead of white. It still reads as a strobe but is noticeably easier on the eyes than pure white at full screen size.
- Photo or stream backdrop. Aim the screen at your subject like a camera flash and trigger it in short bursts between shots, rather than leaving it running continuously while people are looking at it.
- Bigger room coverage. Open the effect in fullscreen on two or more devices around the space. Each flashes on its own timer, so they won't be in sync, but multiple unsynced flash points still reads as a strobing room rather than one point of light.
Troubleshooting
The flash feels too intense or harsh. White at full screen size is the brightest option this effect has. Switch Color to a darker or less saturated tone, lower your monitor's own hardware brightness setting, and keep runs short rather than continuous.
The screen goes fully black between flashes instead of dimming. That's correct behavior — the "off" phase is fully transparent, not a dim version of your color, so it drops to whatever is behind it, typically black.
I need to stop it immediately and can't find a button. Press Escape — it exits fullscreen right away without needing to locate the on-screen controls first. If you're not in fullscreen, close the tab.
Two screens running the effect aren't flashing together. Each screen runs its own independent flash timer with no shared clock between them, so perfect sync across devices isn't currently possible.
Next steps
For a party effect with variable motion instead of a hard flash, try Disco Mode. For ambiance without any flashing at all, Fireplace gives a warmer, continuous alternative.