A motorized window treatment may include a roller tube, a covering material that is attached to the roller tube, and a motor drive unit configured to be located within the roller tube. The motor drive unit may include a motor drive shaft defining a motor drive shaft rotational axis in a longitudinal direction. The motor drive shaft may be configured to rotate the roller tube to adjust the covering material between a raised position and a lowered position. The motorized window treatment may be configured to adjust a visible light transmittance of the covering material by rotating the roller tube, for example, when the covering material is in a fixed position between the raised position and the lowered position.