1. Open the Alexa app, and Select Smart Home from the side menu (press the three horizontal lines in the upper left-hand corner of the screen).
3. Select Discover Devices in the Devices section.
4. Press the button on the Philips Hue bridge. Your Philips Hue bulbs should appear in the Devices section of the Alexa app.
5. Create a Group to control the lights you desire. Select Create Group in the Groups section of the Settings menu. For example, you can create a Living Room group to control all the lights in your living room (as well as any other smart home devices you have linked to Alexa). Confusingly, Alexa considers Philips Hue scenes (specific lighting patterns, such as "Arctic Aurora") as well as any groups of lights you created in the Philips Hue app, as individual devices. For example, in the screenshot below, I can select not just individual Hue lights (Hue bloom 1, Hue lightstrip 1, Hue color lamp 1), but also the groups I created in the Philips app (Living room, Coffee table, and Bedroom), as well as the Philips Hue scenes (Bright in Bedroom, Colorloop in Living room, and Nightlight in Bedroom).
If you have set up scenes in the Philips Hue app, selecting them here will let you change the color of your lights to that particular scene. However, you can also change the color of your lights by linking your Alexa account to IFTTT, and creating an applet.
7. Open the IFTTT app (or website) and select Create an Applet.
8. Press the This button. This will let you select a trigger.
9. Select the Amazon Alexa icon.
10. Choose "Say a specific phrase.” This will activate the Echo when you say “Alexa trigger…”
11. Enter the phrase you wish to use. If you want the lights to turn blue, type “lights to blue” and press Next.
12. Select “That”.
13. Scroll down and select the Philips Hue icon.
14. Choose Change Color. Here, you can select not just the color you want the lights to change to, but also which lights you want to change color. Then press Next.
16. Press Finish in the following screen to activate the applet. Here, you can also specify whether or not you want to receive a notification every time the applet runs.
Keep in mind that if you want to simply turn the lights on or off, you have to say “Alexa, turn living room lights on.” However, if you’re going through IFTTT, you’ll need to say “Alexa, trigger lights to red.”