How do I adjust the brightness of the control panel LEDs?
Tap the Dimmer icon once to dim the lights to LOW, tap it twice to shut the lights OFF (the air purifier will not shut off), and tap it a third time to return the brightness to HIGH. The unit always turns on with the brightness on HIGH, and the Power and Bluetooth icons will always remain illuminated.
From the official Honeywell HPA8350 Air Purifier manual, page 5
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