You may try to check this link.
http://paranormal.lovetoknow.com/Ghost_Orbs_Different_Colors
The Different Colors of Ghost Orbs and Their Meanings
Clear Orbs
Clear orbs may be a sign that an entity is trying to communicate with you. The spirit may be trying to let the living know that some kind of significant event happened in that location, and that the spirit wants help to move on.
White or Silver Orbs
Spiritually, white or silver is associated with spirituality and connection with a higher source. Some investigators believe orbs that are either white or silver in appearance are an indication that a spirit is trapped on this plane. It may also be a sign that the spirit is there to offer protection to the people in the area. White energy is typically perceived as highly positive in nature.
I also had an experience seeing an ORB when I was in college. As I was sleeping I thought I was just dreaming. But my eyes were fully opened and I really saw some kind of a tunnel with a light at the far end then I heard a voice calling me and there was something pulling at my hand. I couldn't move my body, there was some kind of a force that paralyzed me. I was afraid and just tried to calm myself and prayed the Our Father , I repeated it 3x as I couldn't seemed to finish it, I tried and tried until finally on the 3rd I finished the prayer and I instantly moved my body and the light was gone. According to my friend who is a member of the SPIRIT QUESTORS group founded by Tony Perez, an earthbound spirit was trying to reach out or communicate with me to ask for help. My friend was the one who helped me open my third eye, and I have some paranormal experiences together with him. For more info and paranormal stories maybe you could also try to check about Spirit Questors and Tony Perez