1) Add a multiply node and a constant node.
2) Plug the Texture Sample (the one your using for the reflection) into the 'A' slot of the multiply node, and plug the constant node into 'B'.
3) Plug the multiply node into slot 'B' of your add node.
4) Adjust the value of the constant node. The lower the value (e.g. 0.5) the less intense the reflection will be.
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