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Duplicate sphere layer once (use the short key Cmd /Ctrl+ J or Layer > Duplicate Layer). Change a Blending mode to "Linear Dodge (Add)". This layer helps to give shiny effect to the sphere and make texture more "live".
Back to the first sphere to create a small spheres. To make this easier, use a Move Tool (V) + hold Option/Alt. Drag the the sphere to the right place. So you can quickly duplicate the sphere and work with them.
To resize spheres use Free Transform tool (Ctrl/Cmd+ T or Edit > Free Transform). Reduce the size of spheres depending on the close to floor. Rotate the sphere so that the lightest part is directed towards the central sphere.
So I endeared sphere. You can try to make your own version and arrange them differently. To make the picture a little more interesting, I made a double sphere.
Merge all layers with the spheres (select layers and use Cmd /Ctrl+ E or Layer > Merge Layers...) except a central sphere and its additional layer.
Add a Layer mask. Use a Brush Tool (B) with there settings: Size: 200px - 100px, Hardness: 100%, Opacity: 100% (Click D then X on keyboard to set background color to Black). and remove part of sphere on beams. Apply the mask to this layer (click right mouse button on Layer mask, in list select "Apply Layer Mask").
Create effect 3-D to spheres. Duplicate spheres layer once (use the short key Cmd /Ctrl+ J or go to Layer > Duplicate Layer). Go to Layer Style > Blending Options in a Layer panel and remove the checkbox from Red channel. Move it (My combination: down five times and six times to the left).
Set Opacity to this layer 85%.
Now add a Layer mask to this layer and used Brush Tool (B) (Size: 200px, Hardness: 0%, Opacity: 70%.), remove part of effect on spheres.
Now add some light on them and shadow. Start by adding light. Create New Layer used Cmd /Ctrl+ Shift + N, set Mode: Overlay, set the check-box to: Fill with Overlay-neutral color (50% grey). To fill the new layer of neutral gray. Such a layer, we will only for lighting. In the future, we will use only the usual layers.
Use a Dodge Tool (O) with settings like shown in the image. Lighten up the spheres where they are turned to main sphere, to make them glow effect. This layer must necessarily apply only to spheres without 3-D effect (Hold Option/Alt and click on lower layer).
Create a new layer without Overlay-neutral color (Cmd /Ctrl+ Shift + N). Take a Brush Tool (B) (Size: 200px to small spheres and 400px to big, Hardness: 0%, Opacity: 70%.). Dot put under spheres a shadow.
Place the shadow layer under the layer with the spheres without effect and set Opacity of this layer - 51%. Merge all layers with spheres in the one group "Spheres" (select layers and use Ctrl+ G).
After we placed sphere, we can start creating lightning and the main lighting. Create a new layer under group "Spheres". Take a Brush Tool (B) (Size: 1200px, Hardness: 0%, Opacity: 100%.).
Make a dot, a little below the main sphere, like shown in the image.