Hello, I am a cop and I have a problem that we are unable to find an answer for at the station. We want to put portable spotlights on the roofs of our cars. We want to know at 100 MPH how many pounds of force are being applied to the the front of the spotlight. We need to know this so we can buy the appropriate magnets to ensure the spotlights don't blow off. For the life of me I cannot find the answer to this. Can anyone help? Thanks!