Which photoreceptor cell type becomes less effective as light levels decrease?

Cone cells are specialized photoreceptors in the retina that are responsible for color vision and function best in bright light conditions. As light levels decrease, their efficacy diminishes significantly, leading to a reduced ability to perceive color and detail in low-light environments. In contrast, rod cells are specifically adapted for low-light vision, becoming more active as light levels drop, which allows for improved sensitivity to dim light. Bipolar cells and ganglion cells serve important roles in processing visual information but do not directly function as photoreceptors like cones and rods. Thus, the best answer to the question regarding which photoreceptor cell type becomes less effective as light levels decrease is indeed cone cells.