I have a GE 175W Mercury lamp that started doing that (Stiration). It was in a Brinks/Heath Zenith/Regent Yardblaster fixture when it started doing it (Cheap Ballast). At the advice of another member, I took the lamp, and stuck it in my 250W Merc Luminaire, after a few seconds of stirring, it finally ignited, and started warming up. After 15-20 seconds, I took it out, and put it back in the yardblaster (that's where I needed it at the moment), and it still works. It just needed a jump in the arc current.
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