How does one know when a flow is heavy or light or if there is a flow at all.
Look for nectar in the hive. Cells recently filled with thin nectar are a sure sign of a flow. Lots of cells recently filled with thin nectar and all the bees working heavily is a good sign of a strong flow. No nectar, a lot of fighting and robbing and grouchy bees are a good sign of a dearth.