Stack Downlight: A Bulb That Gets To Know You.

What if your lights could understand their surroundings? Stack added occupancy- and ambient-light sensors to its LED Downlight bulbs. The result is a lightbulb with smarts: It can turn off when you leave a room and recognize when it’s morning in order to wake you up. To protect you, the system can even mimic your lighting habits when you’re away on vacation. Don’t like the schedule? You can custom-program it yourself with a companion app. $150 (for a starter pack of two bulbs and a hub; $60 for each additional bulb); ships in December.