https://www.techhive.com/article/3405636/new-philips-hue-smart-bulbs-don-t-need-the-hue-bridge.html
With the new generation of bulbs, you can start with just one bulb (and add up to nine more) and control them with the new Philips Hue Bluetooth app (available for Android and iOS) or with a Google Home or Amazon Echo smart speaker that’s in the same room as the bulb (in the Amazon Echo lineup, direct compatibility is currently limited to the 3rd-generation Echo Dot, the 2nd-generation Echo Show, and the 1st and 2nd generation Echo Plus).