7. CleaningThe cleaning of internal and external optical lenses and/or mirrors must be carried out periodicallyto optimize light output. Cleaning frequency depends on the environment in which the fixtureoperates: damp, smoky or particularly dirty surrounding can cause greater accumulation of dirt on theunit’s optics. Clean with soft cloth and use normal glass to clean liquid. Always dry the parts carefully. Clean the external optics at least every 20 days. Clean the internal optics at least every 30/60 days.36F