I've done this before in experimentation. I just used a cylinder prop, color white, transparency set pretty high (you'll have to experiment here.) Move the cylinder to the figure's hands, and adjust the proportions to the size of the beam that you want. If you're animating, I'd set the beam to be small in the y-axis, growing in length until it hits the target. The speed of the beam will depend on how many frames you use to make it grow. Then, I put a spotlight on the end of the cylinder where his hands were. Attach the light as a child of the cylinder beam. Set the light color, and set intensity absurdly high, like 150-200%. You may have to adjust the start/end angles of the light beam to get the effect straight down the cylinder...takes experimentation. I moved/proportioned the beam in my experiment to "grow" out of his hands, hit the target, then shrink again...this was tough. I moved the cylinder towards the target as I shrank it to give the effect of disappearing into the target. lot's of trial and error, but worth it I think.