Update
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Tuesday 10 April 2018 at 13:50
Drop ceiling strip is probably too wide. You are looking for the 1/2" x 1/2" Aluminum angle strips in the hardware-raw material section. They are $2.18 at my location for a 3' piece, or you can get an 8' piece for about $5.50.
https://www.lowes.com/pd/Steelworks-3-ft-x-1-2-in-Aluminum-Solid-Angle/30...
Source: http://pinside.com/pinball/forum/topic/poor-mans-stadium-lighting/page/6#post-4330658