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.
this method does not work.
It cannot be known if this method is effective but the system assumes it is incorrect.
( z1 work :polarity - :ARG1 ( z2 method :mod ( z3 this ) ) )