Do you need a comma before by?

[sahanav]

In the following sentence is the usage of comma right? Is it treated as a subordinate clause?

Goal: Revival of the fountain in Peru, by creating different light scenarios and an energy efficient fountain.

 

[sahanav]

Please help

 

[emsr2d2]

Please don't chase us for answers after only an hour and 25 minutes. We are doing this in our free time and we will get to your question when we can.

 

[sahanav]

Sure, regards.

 

[Tdol]

I'd say it's optional.