Photobiomodulation (PBM) therapy, also known as low-level laser therapy (LLLT), has emerged as a promising non-invasive medical treatment. PBM involves the use of low-intensity red and NIR light to stimulate cellular function, promote tissue repair, reduce inflammation, and alleviate pain. Its effectiveness has been demonstrated in various medical fields, including wound healing, musculoskeletal disorders, and neurological conditions. Researchers continue to explore its potential in enhancing recovery after surgeries, managing chronic pain, and addressing neurodegenerative diseases. The accuracy of the dose delivered (determined by the irradiance of the device and the time of therapy) is of utmost importance, making the high-speed and NIST-traceable measurements of the OL 770 High-Speed Test and Measurement System an invaluable tool for maintaining the validity of the therapy and potentially the safety of the patient.