If all you need is one spark a year. Okay, it does a bit better than that, but not by much. But it's tiny, self-regulating and pretty foolproof.
Comments
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Mmhh... Nice but it doesn't work in ambient heat (I suppose it cools down faster than heating up). But you actually won with the other one :)
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Got rid of the INST and added an ARAY instead (less particles, still clear proof of SPRK)
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The INST isn't part of the device, it's just there to flash when a spark is generated (doesn't happen often, you wouldn't want to miss it!)