Light Sweep — effect skill for transitions

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A bright band or lens flare sweeps across the frame and the shot changes behind it.

What it does

Built on Light Transitions by HeyGen (HyperFrames), Apache-2.0. The write-up and recipes below are varg's.

A diagonal streak of light crosses the image; at its brightest point A becomes B.

When: Product shots, luxury, beauty and logo reveals.

Watch out: Fake-looking hard-edged flares; keep the band soft and the colour matched to the scene.

Timing: 0.5–0.8 s (CapCut Light Sweep II 0.8 s, Lumin Flash 0.8 s)

Also called: Light Sweep II, Lumin Flash, Lightflow Scan, lens flare transition, shine sweep

In FFmpeg

Moving soft white band (generated with geq) screen-blended over a fade:

ffmpeg -i a.mp4 -i b.mp4 -filter_complex \
"[0:v]fps=30,settb=AVTB,format=yuv420p[a];[1:v]fps=30,settb=AVTB,format=yuv420p[b];[a][b]xfade=transition=fade:duration=0.3:offset=4.7[x];\
 [x]geq=lum='min(255,lum(X,Y)+180*exp(-pow((X+Y*0.5-(T-4.5)*3000)/120,2)))':cb='cb(X,Y)':cr='cr(X,Y)'[v]" -map "[v]" out.mp4

(geq is slow; for long clips trim the window first.)

In HyperFrames

Light family blocks: transitions-light, overlay editorial-flash-overlay; or tween a wide (2400px+) soft gradient bar across with mix-blend-mode: screen while swapping scenes at its peak.

In Remotion

<TransitionSeries.Overlay durationInFrames={20}> containing a rotated white gradient <div> whose translateX is interpolated from -100% to 100%, with mixBlendMode: 'screen'.

In CapCut

Transitions tab → Light Effect → Light Sweep II, Lumin Flash, Lightflow Scan. Desktop: drag the tile onto the cut between two clips and set Duration in the right panel ("Apply to all" reuses it on every cut). Mobile: tap the small white square between clips, pick the transition, drag the duration slider, tap ✓. Tab labels and placement change between versions and regions.

Ready-made components

Where this comes from

Use when

Not for

Install

Example output

https://s3.varg.ai/how-to/previews/f46b2c13dda1/take-light-sweep.mp4 — light between two shots, with the timeline strip of the edit. Footage: WING IT! (2023), Blender Studio | studio.blender.org, CC BY 4.0; Cosmos Laundromat (2015), (CC) Blender Foundation | gooseberry.blender.org, CC BY 4.0. (credit: Rendered by varg · WING IT! (2023) + Cosmos Laundromat (2015))

More transitions skills

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