The Hallman Pro model only comes with one spring.  It is the standard spring (also known as the "heavy" spring).
The Hallman Pro RX model comes with two springs.  The light spring is pre-installed but it also comes with a standard spring that you can install instead of the light spring.     If you want to swap the springs in your Pro RX model, please see section 6 of the Pro series instructions linked here.
The Pro model has the ability to raise turbocharger boost more than the Pro RX model.    The Pro model can raise the boost substantially, to 30 psi or more.  That does not mean it is safe to do so.
The Pro RX model with the light spring installed, unlike the Pro model, is designed to only provide a few extra PSI of boost over stock.  It allows for very specific control of boost in finer increments.  The Pro RX model is considered appropriate for low-boost setups.
You can ruin your engine if you do not do your research to determine what is safe and what is not safe.  It varies tremendously depending on what car, what modifications have been done, etc.  We will not tell you what is safe, that is your responsibility to research.  It may sound harsh that we are not answering that for you, but after you research, you will understand why we state this.   It is because there are many factors to consider.