One might argue that I just changed the design but something else might be of interest for you and that is the arrangement of the LED's
Step 1: Tools and Materials
An old solar garden light
Copper pipes and fittings (of course)
Soldering iron and electronic solder
Hot glue and/or 5 minute epoxy
Ruler, tape measure, compass and caliper
Drill press + drill bits
For details on the donor, wiring and schematics, please see Miss Betsy's Rechargeable Solar Nightlight!
Step 2: Preparing the Acrylic
For the same reason drill acrylic at low speeds, in this case after marking and predrilling with a 5mm drill bit. The LED's fit nice and snug.
Step 3: Preparing the Copper pipe and Wiring the LED's
Then I soldered the wires to the LED's and a first test was successful.
I like to test and retest the assembly after each step so that I can catch any malfunctions right away which saves me taking the whole thing apart..... (You know what I am talking about?)