Philips LED 463216 A19 Party Bulbs: 8-Watt (60-Watt Equivalent), E26 Medium Screw Base, Red Light, 6-Pack
Why Your Hue Dimmer Switch Is Showing A Red Light (& How To Fix It) - Smart Home Winner
Using Hue Dimmer to brighten and dim light with Node-Red (via Zigbee2mqtt) - Configuration - Home Assistant Community
Philips Hue on Twitter: "@JHaj08 The red LED light indicates that the sync box is onboarding in power saving mode. Just to double check all the devices are on the same network