[OH3] Model - Equipment vs Properites

This link might be useful for you to check your configuration.

Lightbulb is an Equipment type , so you’re essentially telling openHAB ‘this is a group Item’ when you use the Lightbulb tag. Equipment Group Items don’t have Properties.

For Properties to work it needs to be a single Item, most often combined with a Point. Hopefully it’s clear in the link above!

EDIT: Removed misleading info.