What was said below is very true, but isn't it possible that it would be
much less work by adding a booster transformer at or near the far-end ?

James

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You have 380 watts on a 600 watt transformer. You don't need another
transformer, you need to increase the conductor size feeding the lights or
split the lights between two separate cables, both coming from the same
transformer. You cannot connect a second transformer to the low voltage side
of the existing transformer, if that's what you had in mind. Tough as it may
be, you need to run another cable and split the circuit