When using the Rainbow Brain there is no DMX signal on the wires providing power.
The Rainbow Brain receives DMX signal on a separate Cat5 and the Rainbow Brain outputs 12v DC across 3 pairs of the Cat5.
Each color of the rainbow flood draws 0.72 amps
The Rainbow floods just turn on when the circuit is completed by the Rainbow Brain.
As far as the distance you can go, you can probably go pretty far but as your length increase your voltage decreases. Lower voltage on the Rainbow floods will make them not quite as bright.
Check out dmaccole's response above and you probably wouldn't even notice.
Check out the Rainbow Flood User manual:
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Loginand the Rainbow Brain User manual:
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