relay buzzes while energizing

It may be worthwhile checking to see if your control signal is actually a fancy dimming setup that works by changing the pulse width. If it is, you may no longer hear the buzzing, but it would tend to stress the relay contacts by rapidly opening and closing during the transition between open and closed. Depending on how big a load you're putting on the relay vs. its rating, it might cause a premature failure because that's hard on the relay contacts. Assuming you don't have something like an oscilloscope available, you could try hooking up an LED to the signal, and watch it as you open and close the doors. Does it just turn on and off in one shot, or does it flicker during the transition, like LED taillights on some of the newer cars? You have to kinda sweep your eyes around nervously to see the flicker depending on how fast it is due to the persistence of vision phenomenon. Changing the duty cycle is one way to get reduced brightness with better efficiency than using resistors, but if that's how your domelight is set up, you may need a circuit to handle it cleanly.