Can someone tell me the purpose of Hue Lights and why I would want colored light bulbs in my house?
The color of light you are exposed to has a direct, material, scientifically measurable impact on your brain chemistry with particularly impact on your melatonin production. It also impacts your mood and, hell, even your vision as your tolerance for light reception in your eyes is not constant and it is not consistent across all colors.
So, use your imagination in conjunction with the basic facts about how light is perceived by humans and you can start to see ways it is helpful to have this kind of dynamic control.
For example, if you ever have to get up in the night, you can have low red lights come on which will have the least impact on your vision in the dark and have a low impact on how easily you can get back to sleep.
You can have your lights cooler during the day and warmer at night, like daylight sun vs. evening light, which helps maintain a healthy sleep cycle. Light therapy isn't ******** like aromatherapy. The color of light, especially orange vs. blue, directly impacts your mind's willingness to accept that it's time to sleep.
Personally, we also use it to set moods for events like movie watching (dim orange, like old school theater running lights) or holidays. There are third party apps that can do fun things like make dynamic light shows synchronized to holiday imagery and music displayed via AirPlay on an Apple TV as one example.
Furthermore, automation is applicable whether you're using colored lights or just the "white" lux which can adjust color temperature. For example, I have a set of lights turn on in the morning when it's time to wake up. This is VERY helpful in the Winter time with no light in the mornings. I have a light strip mounted under my daughter's bed that acts as a nightlight and becomes quite a lot lighter and brighter in the morning prior to the time she has to wake up for school which has noticeably helped in that process.
Unless you're literally blind, light has a direct, measurable, and very significant impact on your perception of reality. Why wouldn't you want to control it in more detail if you could?
That's why I have Hue lights all around the house. Not every light, mind you, but, enough to give ambient control over color and brightness in every room.