[1] Take a new file of 500 pixels, 400 pixels, of resolution 72 dpi in the RGB mode.

[2] Using the “Elliptical Marquee Tool” draw a shape as shown below fill that layer with #96938a.

[3] Take the “Burn Tool” & then create the following shading
with the help of Burn Tool.

[4] Now create a new shape with the help of ‘Ellipse Shape Tool’ fill that layer with #928e71.

[5] After that create the following selection with the help of ‘Elliptical Marquee Tool’
then go to Select>Modify>Feather Selection by 1px.

[6] Now press Cntl+Shift+I, then take the  “Burn Tool” create the following shading do not ‘D’ select.

[7] After that press Cntl+Shift+I, then take the  “Burn Tool” create the following shading do not ‘D’ select.

[8] Take the “Dodge Tool” & then highlight the following parts as shown below.

[9] And now take the ‘Brush Tool’ apply the following settings.

[10] Now create a new layer make sure your foreground is set to #797961.Now create ‘Stroke’ with the help of
‘Ellipse Shape Tool’ right click select ‘Stroke Path’ now select ‘Brush’ click ok.

[11] With the “Dodge Tool” & then highlight the following parts as shown below.

[12] Now Open New Layer & then create the following shape with the help of ‘Pen Tool’ right click select ‘Make Selection’
In Make Selection ‘feather radius’ should 0 pixels,Tick on New Selection & then ok & fill the selection with #9f9c89 do not ‘D’ select.

[13] Now go to Select>Modify>Contract Selection by 3px.

[14] Then go to Select>Modify>Feather Selection by 1px.

[15] Now press Cntl+Shift+I, With the “Burn Tool” create the following Shading as shown below.

[16] Now select “Dodge Tool” & create the following shading with inverse selection also Ctrl+Shift+I.

[17] And now create the following selection with the help of ‘Pen Tool’ then go to
Select>Modify>Feather Selection by 1px.

[18] Now open a new layer fill the selection with black color.

[19] You’ve already finished this tut with sample details:
This is my final result with some other details.

http://tutorialqueen.com/photoshop-tutorials/photoshop-light-lamp-tutorial