Khyber's Journal: Fun idea

Let's say I'm running a servo off PoE, 48V. The servo at maximum can handle 30V. Assuming that, could I toss 18V worth of LED drop in there, and still have PWM control signals pass through cleanly from LED to the servo motor, since the LED is a passive component? I'm thinking that this would serve also as an indicator for operation, as if it is on obviously the signal/current/voltage is passing and the circuit is complete.