Well the "builder" at Ask the Builder, Tim Carter, answered with a quick fix for what seemed to be a big problem: Grab some pliers and pull up the tab.
Flickering bulbs or bulbs that burn out quickly can be caused by light bulbs that were screwed in too tightly to their light fixtures. A malleable brass tab at the base of the light socket gets flattened out over time and, as contact with the light bulb is broken, it may cause the bulb to appear as if it was burnt out.
He suggested cutting all power to the light fixture with the circuit breaker and using needle-nose pliers to "slowly pull it up so the end of the tab is about one quarter inch off the base of the socket."
But before you put a new bulb in, turn power back on to your device.