Indirect illumination is the illumination of the indirect light produced by shielding the light source, in which 90% 100% of the luminous flux is reflected in the working face through the canopy or wall reflection, and the light below 10% is directly irradiated into the working surface. There are usually two treatments, one is to place an opaque lampshade in the lower part of the bulb, and the light is reflected into an indirect light on a flat top or other object; one is to place the bulb in the lamp slot, and the light reflects from the flat top to the interior into indirect light. When this lighting method is used alone, pay attention to the thick shadow of the lower part of the opaque lampshade. Usually used in conjunction with other lighting methods, special artistic effects can be achieved. Shopping malls, clothing stores, meeting rooms and other places, generally used as environmental lighting or improve the brightness of the landscape.