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Step 17: Controlling the Extent of the Light
Select all the layers within the "light” group, and group them again by the same method described in Step 16. It’s not necessary to rename this new layer group.
Select "Group 1″ in the Layers palette and create a layer mask for this group by clicking on the "Add a layer mask” icon at the bottom of the palette. The mask will appear ahead of the group name – it looks like a white box.
In the Layers palette, click the layer mask thumbnail (the white box) to select it. Select the Gradient tool (G).
As described in Step 6, make sure the gradient preset is Foreground to Transparent and the type is Linear Gradient. Starting at the middle of the floor, click and Shift-drag to a spot approximately as shown in the image below. A preview of the mask just created will appear in the layer mask thumbnail.
Step 18: Adding a Highlight Spot on the Floor
Collapse "Group 1″ within the "light” layer group by clicking the gray arrow to the left of its name.
Select the "floor_highlight” layer in the Layers palette and duplicate it by pressing Command +J. The new layer will be named "floor_highlight copy.”
Move this new layer into the "light” group by dragging and dropping it directly on the "light” group’s name.
Press Command +T to transform the "floor_highlight copy” layer until it’s approximately 50% of its current width. Press Enter to apply the transformation. Rename the layer to "spot” and change its opacity to 70%.
Step 19: Duplicating the Light
Two more copies of the "light” group are needed. Select and collapse the "light” layer group in the Layers palette. Drag and drop it on the "Create a new layer” icon at the bottom of the palette. A copy of the group, named "light copy” will appear above the original in the Layers palette.
Copy this new group by the same method. There will now be three groups in the Layers palette named "light,” "light copy” and "light copy 2.”
Step 20: Moving the Lights into Position
With the "light copy 2″ layer group selected in the Layers palette, nudge it left 140px by pressing Shift+Left Arrow 14 times (holding the Shift key down while using the arrow keys nudges 10px at a time). Next, select the "light copy” group and nudge it right 140px by the same method.
Rename "light copy 2″ to "light_left,” "light copy” to "light_right” and "light” to "light_center,” to coordinate with their positions in the layout.
Step 21: Spilling the Lights onto the Housing
Select the layer groups "light_center,” "light_right” and "light_left.” Drag and drop them onto the "Create a new layer” icon at the bottom of the Layers palette. Three new copies of these groups will appear above the originals in the Layers palette.
Press Command +E to merge the groups into one layer.
Rename the layer "spill.”
Move it to the top of the Layers palette above the "housing_shadow” layer and change the layer’s blending mode to Overlay.
Flip it vertically by going to Edit > Transform > Flip Vertical.
Nudge the "spill” layer up 230px by pressing Shift+Up Arrow 23 times.
Using the Rectangular Marquee tool (M), make a selection that’s 500px wide by 10px high, starting at the upper left of the layout.
Click the "Add layer mask” icon at the bottom of the Layers palette to add a mask to the "spill” layer. This will restrict its effect to the light housing area.
