If matter and energy are equal, would it be possible to generate an artificial gravity field by using light

You're somewhat on the right track there, because, yes, light does gravitate. But the amount of it, in terms of intensity, that you'd need to get a noticeable gravitational effect, would be truly astronomical.

If you could collect the entire light output of the Sun, not just the part that hits the Earth, for 43 million years, it would equal the mass of the Earth.

Possible, perhaps in theory, but practical? Not in this lifetime.