On the contrary, a heavy metal light is far more likely to vibrate, indeed metal lights are known to crack under harmonic fatigue in extreme situations. Vibration can also be a result of a poor mounting point or a vehicle that is prone to this dynamic. If the mounting point is vibrating, anything attached will as well! Your LIGHTFORCE light should be torqued to 50ft/lbs - 68nm at the mounting point and if everything is solid you should have no issues. We use UV stabilised materials that are inert to weather or real operating conditions. LIGHTFORCE is known for its durability from below -30 C to the scorching heat and dust of the Australian outback and other extreme desert conditions. A little known fact is how extreme cold can cause conventional lights to crack, even the metal components. Alaska and Sweden are two markets where LIGHTFORCE has forged a formidable reputation where only the toughest products survive.