To demonstrate basic safety and proof of principle for Endotracheal UV Light Device. Primary Endpoint: Reduction of viral load in upper airway in patients admitted to hospital positive for COVID-19. Secondary Endpoints: Overall reduction or change for the following endpoints: - Bacterial load in upper airway - Development of ventilated associated pneumonia (VAP) - Days to extubation - Days to Discharge - Inflammatory marker changes (IL-6, CRP) - O2 requirement - Western blot for Spike protein in upper airway - 7-point Clinical Outcomes: death, hospitalized on ventilator or ECMO, hospitalized on non-invasive ventilation, hospitalized on supplemental O2, hospitalized not on O2, not hospitalized but with limitations, not hospitalized and no limitations. - Culture of endotracheal tube tip from extubated patients