Incorrectly Adjusted Trapezoidal Beam Front Light

Even a mal-adjusted trapezoidal beam front lamp is less anti-social than a conical beam lamp
If you adjust a trapezoidal beam front light so it is pointing too high, you will start to dazzle oncoming vehicle operators. However, unless you get it grossly wrong (by which point it will be completely useless for seeing by), it will still be less anti-social than a conical beam front light. If you point it too low, all that will happen is that you wont see much of the path or road ahead.