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Loginsuggests Lightwave makes a DMX ready flash unit already.
There appears to also be a 'self test' mode, where the unit fires when power is applied,
so just connect it to a controller and have sufficient prefire time programmed into the channel to get it to fire exactly when you want it to.
Alternatively, connect a small wall wart to a channel and use the DC output to drive a reed relay to close a contact on the 'manual fire' button or port. (or you have to add one by hacking the unit).
Have you contacted the company to see if they will disclose the old protocol?
Seems that it shouldn't be too hard to program a PIC to translate from a DMX channel to old 'lightwave'.