> Most cheap xenon camera flashes are MUCH longer than a
> microsecond. IIRC, most are around a millisecond

Presumably you mean the $5 U-type from hobby stores

I've no idea how "cheap", this crowd sell a modified bulb with
peak power o/p in less than 2us (186kB)

http://www.lot-oriel.com/pdf_uk/all/light_xe_pulsed.pdf

And solid state LED/laser down to ps

http://www.ibh.co.uk/products/light_sources/nanoled_main.htm

I've got a distant interest in this BTW. A project in the cupboard
requires a sound-triggered flash. I don't think Jason S said what
his actual application is, sorry if I'm muddying the water

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