Failed attempt at the $60 DIY Flex Light

I suggest he use 20ga wire. He should check the UL and AWG charts and see that for chassis wiring, he can use 20ga. wire for the 7.2amps that flows through each segment. At least that's what my calculations come up with. The spec sheet says the lights use 1.5amps/meter.

16 segments x 30cm/segment = 4.8 meters. 4.8 meters x 1.5 amps = 7.2 amps.

Also check the LED strip spec to see how long of a segment you are allowed to run.
 
You can of course feed it from both ends if you start to hit length limitations.

The other trick is to use the 24v stuff, assuming it's available in the colours you need. Not only can you then do all this with far lighter wiring, you can achieve longer runs without excessive losses. It would require slightly different driver electronics, but that's not a problem. It's all available.
 
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