I'm still working on my strobe light, and right now I'm trying to find a suitable opto-isolator so that I can safely trigger my strobe with a 555 or something. It has to be capable of at least 350V, but I'd prefer 400.

I'm looking at electronics goldmine right now, they have a MOC3063 but it has a zero-crossing circuit (I'm assuming the triac will only 'fire' when the high voltage reaches 0V). Since I'm using DC, I figure this wont work.
http://www.fairchildsemi.com/ds/MO/MOC3063-M.pdf

Now they have plenty of NPN optoisolators for sale, but I dont think they can handle the 400Vdc. However, I'm thinking that I can use one of these NPN isolators to control a seperate triac.

Any suggestions on what to do?

Here's the schematic I'm using for my strobe: http://sound.westhost.com/project65.htm

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Jeff Zimmerman
To the optimist, the glass is half full.
To the pessimist, the glass is half empty.
To the engineer, the glass is twice as big as it needs to be.