pir switch

Thisi follows on from http://www.diynot.com/diy/threads/security-outside-lights-that-come-on-with-movement.470443/ I've struggled with this concept for a while as there seems to be conflicting advice. I would be interested in the opinions of some other people than just the police. The...

I purchased 4 of these (2 for each house) https://www.amazon.co.uk/Floodlight-Security-Outdoor-Waterproof-AC85-265V/dp/B00YCDU3I0/ref=pd_sim_sbs_201_2?ie=UTF8&psc=1&refRID=YXDWDPV1HGS8Q4V3YX4B i got the 50w versions. All of which have faulty/poor PIR's. To the point of if i wave my hand in...