Bad lighting can have a significant impact on the quality of a photograph. It can cause shadows to be too dark or highlights to be overexposed, resulting in an unbalanced and unappealing image. Additionally, the wrong type of lighting can also affect the color accuracy of a photo, making it look unnatural or discolored. In some cases, bad lighting can even make it difficult to capture a sharp and focused image, leading to blur or motion distortion. Overall, understanding and managing lighting is crucial for producing high-quality photographs.