maybe a 400W MV (a bit underdriven), but with the ignitor disabled. HPS do not seem to be that far away from the nominal spec perspective, but HPS are very sensitive specie, not only to the exact current, but mainly on how the current changes with temperature. You may try it, it will either run underpowered (check the lamp arc voltage at that state - if signifivcantly below to what the MH uses to work at, it may damage the ballast), or cycle if overpowered. Check also the lamp power (measure the V, A, the power is then approximately 0.9*V*A), if it isn't above the rated 250W, as that would wear the HPS quicker.
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