All the meshes are parented, so its necessary to grab, rotate or scale the right object if you want to operate the entire model. The main object in the parent tree is the top canopy. No texture files are needed for the materials. All the models have real-world scale. The glass holder has a diameter of about 35 centimeters (the arms add some extra width) and entire lamp is about 34 centimeters high. The glass cloche (shade) of the lamp can have two different materials for the matte glass - matte_glass_principled and matte_glass. The second one gives a little more realistic result, transmits more light and produces less noise in cycles renderer. It is highly recommended to use high amount of samples and a denoiser. Both matte glass materials aren't intended to use with eevee render engine. HTe light in this scene is emitted by the ligh_bulb object. Switch to wireframe, click the ligh bulb and edit the incandescent light material if you need brighter or dimmer light or other light temperature (color).  If in your scene this model  takes only a small part of the rendering frame, you can lowen the number of subdivisions for each part. To put the lamp in your scene just append every object except the cailing and the camera.