RE-USE OF CONDEMNED FLUORESCENT LAMPS

fluorescent lamps are being widely used for household lighting instead of the ordinary incandescent ones.the efficiency of a fluorescent lamp is much higher than that of a glow lamp. in a flourescent tube 50% of the electrical energy is converted into light energy, whereas in a glow-lamp only 20% of electrical energy is converted into light energy.
many of us throw away our fused  or condemned florescent lamps because we know that these are useless. but you can re-use then by modifying its circuit arrangement with the addition of two extra components. the mode of connection of a good florescent lamp is shown in fig.1 when both the filaments f-1 and f-2 or any one of then is fused the tube cannot produce light.
refer fig-2 you will nedd only one 220 ohms 10 watt resistance and one 2.5 mfd.400 volts capacitor alongwith the ballast choke and the starter.the circuit arrangement will be as per fig- 2 for 100 w tube, the value of the capacitor should be 5 mfd. 400 v.
if your fused tube lamp does not glow with this special circuit, you may try again by replacing the 220 ohms resistor by an ordinary copper wire.