TP-Link has discounted its 50W smart bulb 43% to just $19.99. Use the Kasa app to turn on/off or dim from anywhere in the world. Set up a schedule, set the mood, and even control with your voice via an Alexa-enabled device such as Echo or Dot. Reviewers rate 4 out of 5 stars (see reviews) on Amazon, where you can get yourself one (or more) for just $20, a good deal considering it typically lists north of $20 and sometimes $30 with various online retailers. See the discounted TP-Link smart LED bulb on Amazon.