How to test fluorescent bulbs<br>Look for dark areas at the base of the bulb. When bulbs age and have been used for a long time, brown spots will appear. If darkness begins to form at the ends of the tube, the bulb may be near its end.
There is a way to tell if a fluorescent bulb might be nearing the end of its life
( z1 way :manner-of ( z2 tell :ARG1 ( z3 truth-value :polarity-of ( z4 possible :ARG1 ( z5 near :ARG1 ( z6 bulb :mod ( z7 fluorescent ) ) :ARG2 ( z8 end :ARG1 ( z9 life :poss z6 ) ) ) ) ) ) )