lights (at least in the continential USA), to my knowledge, were never triggered by weight, at one time they were, and in many cases still are, triggered by changes in a magnetic field. now, many are triggered by movements monitored by cameras.
so now, in some cases, waving your arms like an idiot in the direction of the overhead wire holding the camera may have some affect.
Last edited by hueyhoolihan; 05-12-15 at 12:56 AM.