Light Plasma on cruisers apparently weigh more than normal Plasma, and only very slightly less than Heavy Plasma. Im assuming thats not right.
Also, the ranges for the 3 flavours of Plasma dont seem to make sense. Normal has the longest range, followed by Heavy, then Light. It would seem more logical to have the ranges, from longest to shortest: Light, Normal, Heavy (or the other way around).
The arguement either way goes: Heavy projectile has more initial energy but burns thru it faster, hence shortest range, OR Heavy projectile has more initial energy therefore has longest range.
I suspect more people would be happy with Heavy having the shortest range (otherwise nobody would load anything but Heavy), but thats just a guess.