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.
One can tell if the bulb has been used for a long time when they see areas that are full of blue in color.
( z1 possible :ARG1 ( z2 tell :ARG0 ( z3 one ) :ARG1 ( z4 truth-value :polarity-of ( z5 use :ARG1 ( z6 bulb ) :ARG1-of ( z7 long ) ) ) :time ( z8 see :ARG0 z3 :ARG1 ( z9 area :ARG1-of ( z10 fill :ARG2 ( z11 color :mod ( z12 blue ) ) ) ) ) ) )