"And the unit’s always-on blue glow—which indicates when its primary PECO filter is in operation—can disrupt sleep. (You can’t physically block the glow with a coin or tape, because doing so would block the Molekule’s delivery of air.)"

I'm not sure when this trend of putting blue lights on devices meant to be put in a bedroom started, or when it will end, but for me, this could be the best filter on the market (it's not) and I would still not purchase it based on the blue light.

I have a Winix Air Purifier I bought from Costco in my bedroom and while it has blue lights, they auto-shutoff in a darkened room. There is one blue indicator on the faceplate that stays on, but I remedied that with a piece of eletrical tape.