As part of the Airmega Halo's sleep features (in addition to whisper-quiet functioning), it has a low yellowish night light when in sleep mode, but this can also be turned off so the top panel is completely dark. It has a light sensor and automatically enters sleep mode, dimming lights and noise level when low light is detected.
When in smart mode and it's dark for more than three minutes, the machine will automatically enter sleep mode. If the pollutant levels are “good” for more than three minutes, the fan stops automatically to save energy. But if it detects pollutants, it will restart the fan.
It has four lights indicating air quality levels: blue for good, green for moderate, yellow for unhealthy, and red for very unhealthy. The colored lights show in a halo around the top of the machine. I found it sort of tough to distinguish between levels at a glance because this color-coding system differs from the standards of green for good, yellow for moderate, red for unhealthy, purple for very unhealthy, and maroon for hazardous.Mixed Signals
Hopefully, you come to WIRED Reviews because we actually vigorously test the gear we recommend. I didn't just read the specs online and flip through the instruction manual—this machine was put through some intensely bad air to see if it could hold its own.
As with all air purifiers I test, the Halo was put through testing in various unhealthy air quality situations. I used this model for nearly a month, moving around my house to test in different locations: when cooking on my unventilated gas stove, under my living room window that draws in a lot of building and exhaust fumes, and outside my . Additionally, I use an