What might happen if I turn LED fixtures on before the lighting desk ?

Some LED PAR’s have a Master/Slave function that is configured in the setup menu of the LED PAR. If there is no DMX present when the LED PAR powers up, it will run in the Master/Slave mode selected. A LED PAR running in Master mode will feed DMX out to the Slave fixtures, which will affect any other fixtures on the same DMX line.

If you turn the Desk or DMX source on before you power up the fixtures, they will not run in the default Master/Slave mode because of the DMX input present.

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