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?

WHAT'S IN THE BOX - Includes one White and Color Ambiance 65 TV smart led light strip with mounting brackets designed for use on 65 inch TVs and one

Philips Hue 65 Smart TV Light Strip with Bridge - White and Color Ambiance LED Color-Changing TV BackLight - Sync with TV, Music, and Gaming

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

Hue Bridge Connectivity Issues - Huetips

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Philips Hue Bridge Lighting Controller Hub 3241312018A 46677458478

How to set up your Philips Hue Bridge