How do I adjust the brightness of the control panel LEDs?
Tap the Dimmer icon once to dim the lights to LOW. Tap it a second time to shut the lights OFF (the air purifier will not shut off). Tap a third time to return the brightness to HIGH. The Power and Bluetooth icons will always remain illuminated regardless of dimmer settings.
From the official Honeywell HPA250B Air Purifier manual, page 6
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