I've noticed it is quite random. Sometimes, there is lots, and sometimes there is none. I have lamps that flash a lot and some that almost never flash. Sometimes the flashes are long and intense, other times they are brief and not too bright. I've even had some flash after running for a few hours (although less intense).
When I was in high school, the 400W halides in the gym would each flash once. They would warm up to the clear mercury phase, stay like that for a little bit, and then have a single, intense, bright pink flash that lasted about 1-2 seconds before fading. When it did fade, the lamp acquired its normal colour (sort of like a signal to the end of the warmup period).
Strangely, I have noticed, like suzukir122, that when one lamp flashes, it seems like the others do as well. Like they all flash or none flash. I also noticed it with preheat fluorescent that are all on the same switch. Sometimes they are blink-happy and sometimes they barely flash, but it seems like all the lamps on the circuit do the same at the same point in time.
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