The figure shows the circuit of a flashing lamp, like those attached to barrels

Question

The figure shows the circuit of a flashing lamp, like those attached to barrels at highway construction sites. The fluorescent lamp L (of negligible capacitance) is connected in parallel across the capacitor C of an RC circuit. There is a current through the lamp only when the potential difference across it reaches the breakdown voltage VL; then the capacitor discharges completely through the lamp and the lamp flashes briefly. For a lamp with breakdown voltage VL = 68.4 V, wired to a 93.7 V ideal battery and a 0.146 mF capacitor, what resistance R is needed for 4 flashes per second?

i been getting 2.23e6 but its saying it aint right

Explanation / Answer

R = 0.25 /0.146*10^-6*ln(93.7/93.7-68.4)

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