text: The device is nicely designed and quiet and seems to do a good job lowering allergen levels in our bedroom. However, it has one really silly design flaw - when plugged in it is always lit with an LED (red when off, blue when running). These lights are much dimmer than the night light they offer, but still much brighter than they should be for one's bedroom. I tape over the light, but it is impossible to block it out completely without also interfering with the air flow. Too bad!