Yes, you need a hub because that’s what “talks” to the WiFi enabled light bulbs. They will work well with the Echo, I have two of them. I would suggest that you buy the white bulbs and hub kit, it’s a lot cheaper than the ones that can change the color. If you decide you want color bulbs later the original hub you bought will work with them as well, that’s how I got our house filled with these Phillips Hue bulbs. The Echo makes turning lights on and off very convenient! The switch that is referred to as a dimmer came in very handy for my husband to be able to turn the lights on and off without talking to Alexa.
I hope this information helps