Modern LED lights pulse faster than your camera shutter can keep up.
The DJ uplights at the wedding reception. The LED stage wash at the concert. The arena lights at the school recital. The color-changing panels at the corporate event. All of them cycle their output at a frequency your sensor reads as horizontal stripes.
You see it the morning after the shoot. Hundreds of photos, half of them banded. The dress, the dance floor, the band on stage, the front-row faces. No Lightroom slider removes it. The bands are baked into the JPEG.
If you shoot in silent or electronic shutter mode under LED venue lighting and find horizontal stripes running across your photos, that is LED rolling-shutter banding. It happens when your camera electronic shutter scans the sensor line by line while LED lights pulse at a frequency the human eye cannot see but the camera does. Sony A7 and A1 bodies, Nikon Z8 and Z9, Canon R-series, and Fuji X-T mirrorless cameras are all susceptible. Anti-flicker and high-frequency flicker reduction settings help but do not always prevent it, especially with mixed-frequency LED stage and venue lighting.
Dance floor LED
LED uplighting
Indoor venue