> I'm sure it is and I'm not going to try to picture what I'm
> not even sure you're getting at, but to what effect ?

I was trying to ascertain whether it's possible use a triac on the
opposite side of the half-cycle than is traditional. Take for example
a light dimmer. The triac is turned on between some degree and
the next z-c. If the point at which the triac turned on was fairly high
on the curve, say 90 degrees, this could cause undue stress on
the filament because of inrush current and maybe lead to premature
failure. My question was whether it was possible to have the triac
conducting between 0 and 90 (z-c to midpoint), rather than 90 and
180 (midpoint to z-c) as above. The question was a poorly phrased
attempt to find out if a triac can be forced off when it's conducting

Your FET artwork pretty much answers it, cheers

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