Subject: induced current?

An arc lamp sits in the middle of a steel box. A 30000V pulse 1usec

wide is applied to start the lamp. What kind of currents may I expect 

will be induced in the steel box due to this start pulse?

I only need an order-of-magnitude answer,

so make any simplifications you need. This is not a hypothetical 

question.

This is a fair description of a medical product we are about to

introduce. Thanks for any help you can offer.

Re: induced current?