Tiles for some bulbs have other icons that I do not know what they represent

Hi...In the screen shot below I have several zigbee and z-wave bulbs highlighted that have smaller bulb icons in different colors.  I can't find any documentation on what they represent and what the colors mean. Foyer Light 3 and Hallway 2 are z-wave. The other 4 are zigbee.  Each of the bulb types is from the same manufacturer.

Can anyone tell me what these represent?  The colors don't seem to change.

Thanks.