Pogue's cheap, unexpected tech gifts No. 4: The TP-Link Smart Light Bulb

Bulbs you can control from a phone app, like the Philips Hue and the GE Link Bulbs, have been kicking around for years. The drawback: They’re expensive, because they don’t work without a separate hub, a router-looking thing that requires an internet connection and power. Or $45 for one (the LB120) whose colors you can change just like the Philips Hue.

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