I also wanted to mention that while orbs and "light anomalies" are filmed frequently and in the dark of night on shows like Most Haunted , I notice them very often whooshing through during the filmed daytime segments when the investigators are giving the background on the haunted property, or the comments they make in the sunshine the next day after the investigation.

And interestingly, while I see these orbs on screen via my cone photoreceptors, they still appear on the grayscale. Some are pure white with a few rare black ones. I have heard the investigators say they see coloured lights (red, etc.), though I have not seen a coloured one on video yet. But there are plenty of photos of coloured anomalies and spirits.