See this article from gotquestions.org. It addresses the popular conception of “orbs” as they are often photographed by ghost hunters or paranormal investigators or caught on video in graveyards and haunted houses. In such a scenario, these are demons which the Bible calls “familiar spirits,” which pretend to be the ghosts of the dead, and communicate with mediums and pagan psychics. The idea of ghosts comes from witchcraft, the occult, the New Age, psychics, spiritualism, and mediums. Although it is a popular belief and there are many horror stories, movies, and TV shows about this subject, the Bible makes it quite clear that such things are demonic. Isaiah 8:19-20: “When they say to you, ‘Seek those who are mediums and wizards, who whisper and mutter,’ should not a people seek their God? Should they seek the dead on behalf of the living? To the law and to the testimony! If they do not speak according to this Word, it is because there is no light in them.” Leviticus 19:31: “Give no regard to mediums and familiar spirits; do not seek after them, to be defiled by them: I am the Lord your God.”
But don’t let this turn you away from the fact that angelic lights have appeared to Christian saints in the past, and have highlighted thoughts, messages, and revelations which confirm the Bible and the Gospel. Bear in mind that demons and angels alike are ontologically the same type of creatures (spirits or beings of light): its just that demons will always confirm thoughts and concepts that go against the Bible, lordship salvation, and conservative evangelical theology: whereas true angels willconfirm these Biblical truths. Demonic lights abound everywhere: in haunted houses and graveyards (spiritualism), Hindu gurus (Hinduism), the New Apostolic Reformation (antinomian and universalist charismatics), witches (as fairies), etc. The only legitimate angelic sparkle is one that confirms ORTHODOX THEOLOGY, such as the pre-Reformation Catholic saints, the Covenanters (the Reformation), Solomon Stoddard (Puritanism), and possibly John Paul Jackson. Concepts andthoughts that are enforced by spirits outside the pale of evangelicalism are simply “doctrines of devils” (1 Tim. 4:1).