Haunted Canberra - Light Phenomenon ... or something else?

One of series of photographs taken at Blundell's Cottage, Canberra which show some unusual light phenomenon. The strangle blue lights which can be seen in the image, were clearly visible in the majority of the images taken at the this point in the cottage. What this image doesn't show clearly are dozens of tiny light orbs around the ceiling and the upper area of the wall above the door frame. This is interesting light phenomenon which could be feasibly explained by the bright sun light from the window in the background affecting the camera lens. However, there is the possibility that it was caused by something else.