What do the lights on the Philips Hue Bridge mean?

The Philips Hue Bridge has 4 glowing blue lights on top, with some symbols that allude to their functions - but what do they actually mean?

Philips Hue 2.0 Starter Kit review: The biggest name in smart lighting has lots of new competition - CNET

Philips Hue 100-Watt Equivalent PAR38 Smart Waterproof Color Changing Light Bulb (1-Pack) 577262 - The Home Depot

Philips Hue Bridge Not Connecting: 5 Simple Ways To Fix Philips Hue Errors, by LightCheckup.com

Philips Hue Bridge 2.1 - Control Your Home Lighting From Anywhere

Hue Bridge - Smart Control for your Lights

New hue bridge won't connect to internet (third light not lighting up) : r/ Hue

Here's how to add Ikea Trådfri lights to the Philips Hue Bridge hub

WHAT'S IN THE BOX - Includes one White and Color Ambiance smart LED play light bar base kit with plug; Perfect for immersive gaming and TV watching

Philips Hue Smart Play Light Bar Base Kit, Black - White & Color Ambiance LED Color-Changing Light - 1 Pack - Requires Bridge - Control with App

The Philips Hue V1 Bridge Is About To Lose Support And Owners Are Furious - SlashGear

What is a Phillips Hue Bridge, and do you need one?

Powering the Phillips Hue Bridge with PoE (Power over Ethernet)

Hue Bridge - Smart Control for your Lights

New Philips Hue bridge works with HomeKit, lets Siri control lights

Philips Hue: Supported lights and devices (Hue compatible)

Philips Hue Bridge Lighting Control Hub 2nd Gen #3241312018A POWERS ON -UNTESTED 46677458478