Abstract: An operating lamp and a method for adjusting light spots in an operating field of an operating lamp are disclosed. The operating lamp includes a first lighting unit, a second lighting unit, and a control unit. A light beam emitted by the first lighting unit forms a first light spot having a first equivalent diameter in an operating field, and the first light spot have a light distribution that meets an operating lamp standard. A light beam emitted by the second lighting unit forms a second light spot having a second equivalent diameter in the operating field, and the second light spot have a light distribution that does not meet the operating lamp standard. The second equivalent diameter is greater than the first equivalent diameter.

Abstract: An operating lamp and a method for adjusting light spots in an operating field of an operating lamp are disclosed. The operating lamp includes a first lighting unit, a second lighting unit, and a control unit. A light beam emitted by the first lighting unit forms a first light spot having a first equivalent diameter in an operating field, and the first light spot have a light distribution that meets an operating lamp standard. A light beam emitted by the second lighting unit forms a second light spot having a second equivalent diameter in the operating field, and the second light spot have a light distribution that does not meet the operating lamp standard. The second equivalent diameter is greater than the first equivalent diameter.

Abstract: A hydraulic drive system includes an oil supply device, an oil return device and a hydraulic cylinder circuit component. The circuit component includes a hydraulic cylinder, a first and a second two-position two-way electromagnetic directional valves. The cylinder includes a first chamber and a second chamber that has a piston rod. A first port of the first valve connects with the first chamber and a first port of the second valve connects with the second chamber. When the oil supply device connects to a second port of the first valve and a second port of the second valve connects to the oil return device, the piston rod is extended outwards. When the oil supply device connects to the second port of the second valve and the second port of the first valve connects to the oil return device, the piston rod is retracted.