Some smart light bulbs, such as the Philips Hue series, provide an API which the Raspberry Pi can interface with using an appropriate library (e.g. `phue` for Python). With enough programming skill, you could set your Raspberry Pi up to slowly turn on the lights in the morning for a gently awakening, or let you control the lights using your voice thanks to software like Mycroft. You can also connect non-smart light bulbs to your Pi using a power relay.
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