well...it takes two words to say.
Continuing the saber handle you:
draw a white line(select width) -> go to layer ->layer style ->outer glow (color, intensity..spread..bla bla...).
Adn then you merge it all and put a lens flare where the blade binds with the handle.(again intensity, type...bla..bla)
I'll PM you if you need anymore details..posted this for rex also.