Rogue Leader said:

Someone earlier said something about the color of the ion cannon... Lemme get that one first: The ion cannon (I could of said the KDY v-150 Planet Defender class ion cannon... see how good I'm being?! ^^) is suppose to be blue, ion cannons have been established in ANH as blue with electrical discharging sparks. Recall R2 being shot in the canyon by the jawa: blue. In X-wing and TIE fighter the games: blue. Now ion cannon in Revisited: BLUE! yay! ^^ Considering how much blue Ady has removed from ESB maybe he thought he'd add some back with some hot ionized blasting awesomeness.

It was me that mentioned the Ion cannon (unless there was someone else) but i never said i disagreed with it being blue. On the contrary, I've always wanted it blue. What I didn't like is there being electricity in the "beam" itself, rather than it being a result of it on the ship on impact.

I'm pretty sure we never saw electrical arcs in the beam itself in mid air in ANH. Only when it hits r2 do we see any electricity, so that's how I think this Ion Cannon should be too.