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metal halide bulb flickering

Andrew,  I use metal halide lighting for my orchids.  The only time it
goes off (other than from the timer) is when power is interrupted.  Even
if the power is immediately restored, it does take a little while for it
to cycle back on (hence your wait), but I suspect you have ballast

When my bulbs die, it isn't gradual .  They are fine, they are dead.
Check out your ballast.  Good luck.