Question: 

 

When it is dark I can see the hose tails glowing on my UV but one is brighter than the other, is this normal?

 

Answer: 

 

Due to the position of the lamp and connectors at one end of the U.V its also quite normal if one end isn’t quite as bright as the other.

If the unit has been recently installed or the pump stopped a pocket of air can be trapped at one end of the U.V.  This will clear as the unit runs but can also cause the brightness of the hosetail to vary.