Reply to "4.5v dc power supply"

Probably "or more".

1n1183

Without getting into the mud about whether these curves apply to DC vs. AC, or the relevance of Tj, etc., look at the vertical axis (Amps).  Approximate how much current you're drawing (note it's a logarithmic scale) and then translate to the linear horizontal axis (Volts).  So for a handful of buildings you're likely in the red-zone so the voltage drop would be about 3/4 Volts.

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