H3 Max Relight changes a video's lighting from a sphere render

fal published H3 Max Relight on October 7, a video-to-video endpoint that changes the lighting in a clip you already have. The endpoint is live on fal's playground and REST API under the model id minimax/h3-max/relight, according to the model page and the endpoint docs.

Relight takes two inputs. One is a source video of up to 15 seconds. The other is a sphere render that shows the target lighting: its color, direction and shadow softness. The model reads the source scene and the sphere, then regenerates the clip under that light. fal's description says the result keeps the source subjects, setting, motion, camera and audio.

The output resolution is 480p, 768p (the default), 1080p or 2K, which is 1440p. The 480p and 768p videos render natively, and fal builds 1080p and 2K from 768p with latent upscaling. fal converts the source to a constant 24 fps and trims it to the closest 17n+5 frame count, leaving at least 56 frames, about 2.33 seconds; the output matches that length. Aspect ratio defaults to 16:9, with adaptive and other options available. Safety checking is on by default.

H3 Max is fal's post-trained variant of MiniMax's H3, tuned for prompt adherence and aesthetics. Relight is the newest endpoint in that family, joining Camera Controls, Extend Video and Recast, and it carries the same per-second pricing tiers as Extend Video.

fal bills per second of generated video, which matches the source length. That is $0.05 per second at 480p, $0.08 at 768p, $0.16 at 1080p and $0.32 at 2K. A 5-second clip at 768p costs $0.40. The Art Realm AI write-up notes that fal's playground includes a Lighting studio for shaping the sphere, and that relighting fits after a background swap, where composites usually fail.

For a creator finishing a clip shot or generated under flat light, Relight offers a way to match a new scene without a reshoot. At the 480p rate, a 15-second source costs $0.75, and the higher tiers cost more per second.

Try H3 Max Relight on fal's playground, where the Lighting studio builds the sphere render, or call minimax/h3-max/relight through the API, listed at https://fal.ai/models/minimax/h3-max/relight.