TYPES OF SPIRIT ENERGY
ORBS - These are the most commonly photographed anomalies captured on film.  They usually are seen as "balls of light" hovering over the ground.  If you look inside them you can usually see a swirling pattern, possibly energy moving around. 

ECTO PLASM/MIST - This is a form of a spirit energy that appears either as long white swirls or as a vopor or cloud like apparition.  It's important for you or other people to not be smoking during a ghost hunt/investigation.  If you must smoke, make a place away from the investigaion for everyone to smoke at.  If someone is smoking around the investigation, then it's hard to tell if it was the smoke from the cigarette or something paranormal on film.  But if no one is smoking, you are not breathing in fromt of the camera (on cold days), there's no fog, and you see no mist with the naked eye, etc. then you may have something.

VORTEX/VORTICES - This is a swirling solumn of white (usually vertical) light that is often mistaken for a camera strap.  Always remember to either remove your camera strap or amke sure it is not in the way of the camera lens to avoid confusion.  The column may be of any color, but the most common is white.  Often a blue-white color may be visible associated with portions of the column being transparent.

APPARITIONS - Some psychics and mediums see them on a regular basis but as for the rest of us it's a very reare occurrence.  Catching an apparition on film is what every ghost hunter aspires to but seldom, if ever sees.  Sometimes it's just a matter of being at the right place at the right time.  They show up in a transparent human form and usually wear the clothing of their period.  You might also note that they normally appear faint and disfigured as in being incomplete, unless appearing as a full body apparition.