For the scotopic system, what is the lumens per watt at the peak sensitivity of 507 nm?

The scotopic system, which is responsible for vision in low-light conditions, has a peak sensitivity around 507 nm, where it is most adept at detecting light. At this wavelength, the light's effectiveness in generating visual responses can be quantified into a measurement known as lumens per watt.

At the peak sensitivity of 507 nm, the conversion efficiency of light into visual perception reaches around 1700 lumens per watt. This high efficiency reflects the capabilities of rod cells in the retina, which are specialized for low-light vision and optimize the perception of dim light, thus leading to this specific value. As light levels in the environment decrease, the scotopic system becomes more prevalent, functioning optimally at this particular wavelength, which is primarily associated with the green part of the light spectrum.

This efficiency rating is crucial for understanding how light can be utilized in various applications, especially in creating environments that support visibility under low-light conditions, such as street lighting or specialized indoor illumination.