I have several Hue color bulbs in the home that reply on the ColorPicker item in a sitemap and use of the colorwheel.
But I find the Hue App much easier to use when setting a color and dimmer level, as well also includes On Off switches and for groups, etc. The Hue Apps use of ‘rooms’ is great for turning on and off groups and setting dimmer and color levels.
Perhaps a future wish list item, but perhaps one day to have the ability to pick a ColorPicker ‘style’ to use a color wheel or other type of color layout? The existing OH2 Colorpicker in a browser seems easier to use then what you see in the App.