For a better result, we have to merge down in a group all the layers composing the sphere and its flare (press the Ctrl button and mark out the necessary layers and then click in the same time on the left mouse’s button to stretch them down on Create a new group option).
Make 5 copies of the new made group and select the Free Transform option to change the sizes of the copies and their placement. Change also the colors’ parameters. The flare’s parameters and Stroke option should be left the way they are.

The parameters of the red sphere:
Blending Options>Gradient Overlay

Gradient’s parameters:

The parameters of the blue sphere:
Blending Options>Gradient Overlay

Gradient’s parameters:

The parameters of the green sphere:
Blending Options>Gradient Overlay