It can be.
If lighting is too dim for the task at hand, people strain their eyes. Over time, that leads to fatigue, headaches, and lower productivity. In spaces where employees are moving around, dim lighting can increase the risk of trips and falls.
In an office setting, low light can make it harder to read documents or see small details on a screen. People may lean forward or squint without realizing it, which can lead to neck and back discomfort.
That said, dim lighting isn’t always dangerous. In a break room or lounge area, softer light may be completely fine. The key is whether the lighting matches the work being done.
Areas that involve detailed tasks, machinery, stairs, or heavy foot traffic need clear, consistent illumination. If someone has to struggle to see what they’re doing, the lighting isn’t adequate.
So yes, dim lighting can be a hazard, but only when it interferes with safety or the ability to perform work properly. Good workplace lighting is about balance, not brightness alone.