1st to 4th generation: these are the differences of Hue lamps & sets - Hueblog.com
Amazon Echo Plus (1st Generation) Smart Speaker with Alexa & Philips Hue Bulb Black B015S1SWLO - Best Buy
What's the difference between these bulbs? Both 800 lumens. Different generations maybe? : r/Hue
Amazon.com: Echo (4th Gen) | Charcoal with Philips Hue Color Smart Bulb : Amazon Devices & Accessories
Philips Hue White and Color Ambiance 2nd Generation Smart Bulb Starter Kit (Older Model 3 A19 Bulbs and 1 Hub Works with Alexa Apple HomeKit and Google Assistant) - Amazon.com