oooh, i meant to make a suggestion about exactly this a couple days ago, but then forgot!
i quite like the colors you're using in that pic. and i agree that the red/orange fits the HIL even if PD Lasers are somewhat similar, since you won't really confuse it with those anyway.
i think it would also be nice if there was more variety in beam width and shape/texture. in most situations, ignoring an Ion Beam is a lot more problematic than ignoring a Graviton Beam, so it feels strange to me that the later has a slightly wider and a bit fancier looking beam.
i posted this a while ago in another thread as beam shape examples:
not that i'm proposing using these exact visuals, but i think they show how beams can be visually differentiable even while using the same base color. i understand that too much visual firework can actually make it
harder to clearly see what's going on in heated battles, which is the opposite of what we want.. but i think, for example, giving the Ion Beam a shape similar to the one in the bottom left of that picture would much clearer visualize "this is a somewhat unique beam, and deals primarily EMP damage". the shape in the top(ish) left could fit the HIL, as the most powerful beam (in terms of dps) in the game, and would help visualize the fact that it can seriously ruin your day if you don't pay attention to it.