Thanks sincerely for your reply, I think you are correct there are dots as you call them, when I view the picture at night, so if I'm reading you correctly this is likely what is setting off the motion detection.
Excuse my ignorance but when you say a better camera, how do I know what is better than what I have, I believed I was buying good cameras, I.e. Sony effio CCD cameras with 700 TVL. Can you point me in the direction of a better camera please?
Re better lighting, should I be considering IR lamps? I really don't want to have traditional lighting always on in the evening.
Even if I could turn the sensitivity down at night I don't think the system is fit for purpose as at sensitivity 2, people are not picked up, day or night. At sensitivity 3, it's great until night time when the MD is set off constantly.
Thanks again for the reply.
Regards
Anthony.