The easy answer is as much as you want to. But because most of us don’t have piles of money to burn, let’s look at the difference between more expensive smart light bulbs and cheaper ones. All smart lighting solutions are more costly than regular incandescent or LED bulbs, but smartbulbs deliver extra convenience, ambiance, and security.
Philips Hue smartbulbs are the industry standard, and they aren’t cheap (the starter kit we recommend comes with two bulbs and the Philips Hue Hub for around $70).
They do offer a good track record, though—and these bulbs should last about five years. If you want lights that can be controlled remotely and integrated with a security system, then we recommend ponying up the extra cash for Philips Hue bulbs.
If all you want is extra convenience, then you’ll be happy with less expensive (and less feature-rich bulbs) like the Cree smart light bulb (starting around $15 per bulb).