White screen for Zoom & video call lighting

Steps

1. Open Instant White on a second device (phone or tablet), not the camera laptop if you can avoid it.
2. Tap Open this preset, or choose Zoom light (warm white, about 90% brightness).
3. Raise the device’s system brightness. Tap the page if the browser asks before fullscreen.
4. Place the screen just out of the webcam frame, aimed at your face from the front or 45° side.

Tips

• Warm white is usually kinder on skin tones than a cold LED lamp or pure #FFFFFF.
• If you see a hotspot on your face or glasses, lower brightness in the controls.
• Exact warm recipe: /?c=warm&b=90&f=1&w=1 — same as the Zoom preset.

Limitations

• This is a phone or monitor fill light, not a studio fixture. It will not match professional key lights.
• The f=1 query asks the page to enter fullscreen. Browsers typically allow Fullscreen API only after a user gesture (tap or click). The request can be denied, and iOS Safari often ignores programmatic fullscreen.
• The w=1 query asks for the Screen Wake Lock API so the display stays on. It requires a visible document, usually HTTPS, and is missing or unreliable in some browsers (notably many iOS Safari versions). The screen can still sleep if the OS, battery saver, or the browser refuses the lock.
• The Zoom / Meet / Teams apps are separate; Instant White only supplies a bright field on another screen.

Related guides

• Phone light
• Clean a monitor
• Dead pixel check