argon gas

halogen gas

helium gas

nitrogen gas

40, 60 watts

100, 200 watts

80, 125 watts

150, 300 watts

diameter of the tube

gases in the tube

length of the tube

thickness of the tube

The true power consumption of the circuit is almost zero

A very small current flows in both the branches

The power factor of the circuit becomes 1 and the tube-lights do not flicker

The total current drawn by the circuit is almost zero

street lighting

storage yards

foggy areas

all the three stated above