Step 5 Select the rectangle layer and go to Filter > Blur > Gaussian Blur. Use 20 pixels for the Radius. As this layer is inside a folder with Color Dodge, the blurry edges will create a really interesting lighting effect.
Step 6 Add a new layer inside the folder with the rectangle. Select the Brush tool (B) with a very soft brush and, using white for the colour, paint a second light source.
Step 7 Repeat the same process with the Rectangle tool (U) and the Brush tool (B) to add more elements to your design. For the light in the centre, create a few vertical lines and then go to Filter > Blur > Motion Blur. Use 90º for the Angle and set the Distance to 90. This will create a stylish reflection effect.