It looks like they are using that term to get your attention so you’ll think it’s cool.
In actuality, they are just plain ordinary low power desk or bedside lamps. Doesn’t look like anything special so I guess they jazz it up with a fancy title.
FWIW, historically, the non-spooky derivation of the term ghost light refers to the ruling that all darkened theaters must have at least one low power light on 24/7 to enable finding the light box to turn them on.
Absent this light, in a totally dark theater it’s pretty much impossible to see anything to avoid accidents or even death (you could break your neck stumbling into the orchestra pit, for instance.)