There are many industries where disinfection without the use of chemicals is critical, and ultraviolet light can provide a safe, effective solution. To ensure light exposure during a disinfection cycle, UV-C Check Strips are used. UV-C Check Strips are photochromic intensity indicators that create a simple, reliable, low cost method of monitoring ultraviolet light intensity. The Check Strips have an adhesive backing that allows for easy application to any surface. When exposed to UV-C, the yellow labels undergo a gradual color change from yellow to green that is directly related to the energy value received. With increased exposure, the indicator labels will deepen in color. While this color change does not guarantee sterilization, it is a way to provide validation of disinfection in a clear and easy manner. UV-C Check Strips are important in ensuring that packaging or surfaces have indeed been exposed to germicidal ultraviolet light.