Sorry mate - I don't have an Insteon hub - all my lighting control is via Zwave. There are heaps of helpful users in the openHAB forums however, I am sure you will get help on there pretty quick.
Also, have you checked out the Insteon Hub WIKI page - https://github.com/openhab/openhab/wiki/Insteon-Hub-Binding?
No worries. I managed to get my Insteon light to go on and off via OpenHAB. It was a struggle!
Next step - Alexa but that can wait for another night.