What is one advantage of using UV lights for disinfection?

Using UV lights for disinfection is highly advantageous because it requires no chemicals. This method of disinfection works by using ultraviolet light to disrupt the DNA of microorganisms, rendering them unable to reproduce and effectively neutralizing their ability to cause disease. The absence of chemicals eliminates the risks of harmful byproducts that can arise from chemical disinfection methods and means there's no subsequent chemical residual in the treated water. Additionally, this characteristic makes UV disinfection an environmentally friendly option, supporting the goal of providing safe drinking water without introducing additional substances into the water supply.

The other choices do not accurately capture the primary advantages of UV disinfection. For example, while UV can be used effectively in various water conditions, it is less effective in very cloudy water, which can scatter the UV light. UV disinfection does not inherently address odor issues, and while it may be cost-effective, it is not universally less expensive compared to all chemical methods, as costs can vary significantly based on the specific circumstances and technologies employed.