We decided to test our wandalproof light fittings, to show their reliability in extreme situations. For this purpose, we used easily available tools, that may be used in public places: baseball bat, hammer of waight 0,8 kg, stone of weight 7 kg, crowbar and also decorative paint and flammable substance, set on fire by th lighter. We tested resistance of INV320 for fire and impact, as well as covering with graffiti spray. Light fitting did not fail in any situation – despite striking and setting on fire, it was still working. Tests caused no damage of components or danger of opening the fitting.