Local atmospheric current densities are very weak, about $10^{-12}~\text {A}/\text{m}^2$, so per electric power law :
$$ P = VI ,$$
few centimeters apart between two terminals of bulb, would generate only about $\approx 10^{-12}~\text{W}$ of electric power, which clearly is not enough to light-up bulb with nominal $100~\text{W}$ power. Thus, unless bulb somewhat near lightning zone,- it will never happen.