Fix a flickering fluorescent light

Q: I’m embarrassed to ask, but how do you change a fluorescent light tube? The light above my garage worktable is flickering, and I guess it’s burning out. — Lucy T., Jacksonville, Fla.

A: Don’t worry, you’re not the only person out there who’s never changed a fluorescent light! These long, thin tubes (they’re filled with a gas that glows when energized) are mostly found in office spaces, where maintenance crews switch them out, and they last quite a long time — three years on average.

Before paying for a replacement tube, check to make sure the one that’s flickering is not simply loose. Turn off the light switch and — using a stepladder or other sturdy ladder — climb to a point where you can work comfortably. Grasp the tube with your fingertips, spreading your arms out as close to each end of the tube as possible so that you have good control and the tube doesn’t fall or break. Now, gently rotate the tube (either forward or back, you’ll feel the correct way) until it snaps firmly into the sockets on either end. Turn on the light switch and see if the tube still flickers.

If it does, turn off the light and inspect the tube closely. Look for signs of discoloration on the ends: worn-out tubes typically have a dark-gray discoloration. Carefully rotate the tube out of its sockets and check the pins on both sides to see if they are bent or broken. If any of these signs are present, it’s time to replace the tube.

Take the old tube to the home improvement store so you can buy the matching size. Install the replacement by carefully sliding the pins into the sockets on each end, then twisting about a quarter turn in either direction to lock it in place.

If the new tube continues to flicker, there is a problem with some part of the fixture. Have a person experienced in light-fixture installation either locate and change the parts that are defective or replace the entire fixture (which sometimes costs less).

HOME TIP: Fluorescent light tubes contain a very small amount of mercury, so don’t just throw them in with the household trash. Contact your city or county’s hazardous waste disposal or environmental agency for instructions on disposing of these tubes.