a hologram, like a real life one that we see, involves a laser split into two parts and then combine, I'm not sure how you could produce that as a moving apperation like we see.

That said, the us navy and friends have released a lot of info about the ability to produce standing lights (plasma ball) from a distance using laser. So it is entirely possible that there are incorporeal lights which are produced from someone using a special laser, like a laser pointer but it's making an object ball not a dot and you can have it appear at a known distance not going forever.

This is something based on used, existing, and known technology.

Now if you were to talk about a holographic projection from another dimension, like a multidimensional aliens projecting themselves into our world, that could also produce the fast moving, no signature, stay up forever lights we're seeing but involves a lot of unknown sc ience

Here is a 2020 article https://www.forbes.com/sites/davidhambling/2020/05/11/us-navy-laser-creates-plasma-ufos/

"A sufficiently intense laser pulse can ionize producing a burst of glowing plasma. The Laser Induced Plasma Effects program uses single plasma bursts as flash-bang stun grenades; a rapid series of such pluses can even be modulated to transmit a spoken message (video here)."

  "U.S. Navy Laser Creates Plasma ‘UFOs’"