Can anyone help me with information if its possible to uppgrade firmware on HUE Bulbs without HUE Bridge (if i connect bulbs direct to Homey)
Can Homey replace HUE bridge and still have all the features left with remote controls, lights and motion sensors?
you cannot update the firmware of the bulbs without the bridge. no brand (osram etc also fibaro in zwave will let this come true 
)
there is a app in the appstore for hue without the bridge which seems really good:
https://apps.athom.com/app/com.philips.hue.zigbee