Which type of light therapy helps with killing bacteria?

Blue light therapy is effective for killing bacteria primarily due to its specific wavelength range, which typically falls between 415 to 450 nanometers. This wavelength is particularly adept at targeting and destroying acne-causing bacteria, such as Propionibacterium acnes, as well as various other types of harmful bacteria on the skin. The energy from blue light penetrates the skin and induces a photochemical reaction that generates singlet oxygen, which in turn helps to eliminate the bacteria.

In contrast, red light therapy is mainly used to promote healing and reduce inflammation, green light is often utilized for pigmentation and skin tone improvement, and yellow light can assist with redness and rejuvenation. Therefore, while each light color has its therapeutic benefits, blue light stands out for its bactericidal properties, making it the correct choice for this question regarding light therapy for targeting bacteria.