@25b5e014 You can adjust them to different wavelengths. Like from cool to warm with 6000-6500K being the most like sunlight. Supposed to help with our S.A.D.  https://www.philips-hue.com/en-us/p/hue-white-ambiance-a19---e26-smart-bulb---60-w--2-pack-/046677548568#overview 

 @d97a8771 well, I'll be. I have some of those and will give this a go.