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.
Dark areas at the base of the bulb means that the light has a long age of time left to use it.
( z1 mean :ARG1 ( z2 area :ARG1-of ( z3 dark ) :location ( z4 base :part-of ( z5 bulb ) ) ) :ARG2 ( z6 have :ARG0 ( z7 light ) :ARG1 ( z8 age :ARG1 z7 :ARG2 ( z9 time :ARG1-of ( z10 long ) ) :ARG1-of ( z11 leave :ARG2 ( z12 use :ARG1 z7 ) ) ) ) )