Final answer:
The subject of this question is Physics, and it pertains to the use and presence of blue light in specific locations such as light boxes, service rooms, and fan shafts.
Step-by-step explanation:
The subject of this question is Physics and the grade level is High School.
The blue light boxes mentioned in the question are devices designed to provide exposure to bright light in order to help people maintain a regular circadian cycle. They can be helpful for people working night shifts or for those affected by seasonal variations in light.
In addition, blue light can be found in some service rooms and fan shafts. This is because some light fixtures and fans may use fluorescent lights, which emit blue light. The frequencies of light emitted by fluorescent lights do not contain all the frequencies of sunlight, which can affect the perception of colors.
Overall, blue light boxes and the presence of blue light in service rooms and fan shafts are related to the physics of light and its properties.