Ordereded as a gift for a friend that admires it everytime she come over. Uses a small light bulb and you can leave it on 24/7. They claim these also purify the air and I believe they do. The soft glowing light is perfect for a nightlight for young and old to see well enough at night so they do not fall, yet the small bulb uses little energy since its a nightlight!  I'd you've been thinking about purchasing one of these lights, it's a good time to do it - and you'll never be sorry!