Have zou tried a shorting cap (or a bypass jumper wire) instead of the photocell? The clicking sound may point to the photocell switching. The "no light" is highly relative term, photocells use to suffice with rather minimum light and because you are messing around the fixture, the cell may get enough light reflected from yourself... Otherwise it could be some intermittent contact somewhere getting interrupted once the thing warms up a bit.
Otherwise take a multimeter (and/or a pair of 230V incandescents in series, as there could be 350V on the secondary) and probe the voltage on the lamp, cap and primary just after the clicking shuts it down, it should point to something.
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