Waterproof crankshaft lamp with adjustable focus

A lamp comprising:

• a housing, an adjusting knob, a sliding unit, a light source, and a lens;
• wherein:
• the housing is provided with a light output opening;
• the adjusting knob is mounted on the housing;
• the sliding unit is mounted in the housing;
• the sliding unit is connected with the adjusting knob;
• the sliding unit includes a sliding bracket;
• the sliding bracket of the sliding unit is provided with an elongate adjusting slot which extends leftward and rightward;
• the adjusting slot of the sliding unit extends in a direction that is perpendicular to a light output direction;
• a driving crankshaft is mounted on the adjusting knob and is located at a position deviated from a center of the adjusting knob;
• the driving crankshaft extends into the adjusting slot of the sliding unit;
• the light source is mounted in the housing;
• the light source is secured to the sliding unit and faces the lens;
• the lens is mounted in the housing;
• and
• the lens is located in the light output opening of the housing.