Welcome to the LASP Interactive Solar IRradiance Data Center (LISIRD) website. We provide access to a comprehensive set of solar spectral irradiance measurements from the soft X-ray (XUV) at 0.1 nm up to the near infrared (NIR) at 2700 nm, as well as state-of-the-art measurements of Total Solar Irradiance (TSI). We also provide an extensive set of solar irradiance models and historical solar irradiance reconstructions generated by LASP researchers.