Which characteristic of a lamp affects how light is distributed in a room?

The shape of the shade is a critical factor in determining how light is distributed in a room because it influences the direction and dispersion of light emitted from the lamp. A lamp shade can either focus light to create a pool of illumination, spread it evenly across a larger area, or direct it upwards or downwards, depending on its design. For instance, a cone-shaped shade may direct light downwards, making it ideal for tasks like reading, while a wider, more open shade can allow light to diffuse more broadly in the space. This direct relationship between the shape of the shade and the distribution of light is vital for achieving desired lighting effects and ensuring adequate illumination in various areas of a room.