Hanging position Data tag MINUS pipe weight

[Bill_Rios]

Hello hive mind!

 

I've been trying to create a data tag that reports the weight of lighting fixtures that are hung but not the pipe weight.

 

With no lights, my pipe reports

 

Add a couple of lights and the data tag adds the weight like it's supposed to.

 

Also, and not why i'm posting but still strange, when I delete both lights, the weight doesn't go back to the pipe weight but stays at the weight where it had the last instrument.

 

Here is the data tag definition i'm using currently:

 

Can someone please help me clean this up?

 

Thank you!!!