The Woods Lamp is a specialized filtered black light developed by Physicist Robert W Woods. It allows for a more thorough skin analysis detecting problems invisible to the naked eye including pigmentation problems and bacterial disorders. It works by reflecting different shades of color for various skin conditions.CE Certified. Return policy will be executed under the following terms: Returns are accepted under the stipulation it is within 30 days from delivery date, verified by package tracking number. Buyer is responsible for return shipping cost in order to guarantee a full refund.