Final answer:
The newest type of light therapy that uses concentrated lights that flash rapidly is Intense pulsed light therapy (IPL), beneficial for various cosmetic and dermatological treatments.
Step-by-step explanation:
The newest type of light therapy that uses concentrated lights that flash rapidly is Intense pulsed light therapy. This treatment is also known as IPL and utilizes specific wavelengths of light to target various dermatological and cosmetic issues. Unlike continuous light exposures, the rapid flashing of IPL allows for intense, brief doses of light without excessive damage to the skin, making it effective for a range of treatments including hair removal, acne treatment, and photorejuvenation. The concept of using intense flashes of light for specific purposes can be traced back to World War II applications and is now also significant in medical and cosmetic fields.