An integrated cap for retrofitting an existing light fixture can include an integrated cap housing that is configured to be disposed atop a pole that supports the existing light fixture, where the integrated cap housing includes a communication module and a transceiver. The integrated cap can also include a first coupling feature disposed at a bottom end of the integrated cap housing, where the first coupling feature is configured to couple to a first component of the existing light fixture to provide electrical signals to the communication module and the transceiver, where the communication module and the transceiver communicate with a second component external to the existing light fixture.