Very nice and fun to play with. Replace one of the batteries with a shiny copper coin or a wad of aluminum foil to act as a pass-through to power the LEDs with just 3VDC. They still shine, but with reduced brightness. Has been lit for over 24 hours and is still bright enough to use. Update: After 150 hours of use it's very, very dark, but still visible in a darkened room.
Smart bulb Yandex with Alice, base E27, 8 W, RGB color
76 Review
Lamp LED Xiaomi Mi Smart LED Bulb Warm White (XMBGDP01YLK), E27, 8 W, 2700 K
26 Review
Lamp LED Yeelight Smart LED Bulb 1S, YLDP13YL, E27, 8.5 W, 6500 K
43 Review
Ceiling lamp Yeelight YLXD013-B, 50 W, number of lamps: 1 pcs., color: white
62 Review