Gardener David Shields shares his modification of the basic plan:
I built the double shoplite version of the growlite 3 years ago (2003). The
following year I replaced the four 17" pieces of pipe with four 24"
pieces and added a third shoplite.
This year, I added a fourth shoplite. I had originally planned to widen the stand but I noticed that my lights were not fitting thru (between) the legs on each side. So... what I did was lengthen it by 2".
I took the two 49" pieces off the bottom and cut them so that they were now 2" longer than the 2 long pieces at the top. Then I replaced the bottom pieces with two 51" pieces. This modification now allows a shoplite to hang between the legs making room for 4 shoplites. This allows me to have 4 trays side by side and 2 at the end (see below).
See Shields updated 2014 design on his gardening webpage.
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