I like Pugs

Multifrequency : -50% to your optimal range (the distance in which your turret will do the maximum of it’s damage potential), give no bonus to capacitor consumed per shot, but have the highest base damage for the shortest range. 12 total damage.

Gamma : -37.5% to optimal range, -15% to cap use per shot (read : using this ammo cost fifteen percent less capacitor when you open fire). 11 total damage.

X-Ray : -25% to optimal range, -25% cap use per shot. 10 total damage.

Ultraviolet : -12.25% to optimal range, -35% cap use per shot. 9 total damage.

Standard : No modification to optimal range, -45% cap use per shot. 8 total damage.

Infrared : +20% to optimal range, -35% cap use per shot. 7 total damage.

Microwave : +40% to optimal range, -25% cap use per shot. 6 total damage. Can also cook your steak.

Radio : +60% to optimal range, -15% cap use per shot. 5 total damage.

T2 Pulse Laser Crystal :

Scorch : +40% to optimal range, -75% to weapon tracking (Weapon tracking is how fast your turrets can turn. If it’s to low, they will have trouble to hit fast and small targets, like frigates). No cap bonus. Total damage 11. Basically, Scorch crystals allows Pulse lasers to play like beam lasers.

Conflagration : -75% to optimal range, -30% to weapon tracking, +25% to cap use. Conflagration is generally less used than the Imperial Multifrequency, because the drawbacks are generally not enough to justify the 15 total damage. It transform your pulse lasers in shotguns which can’t it small weapons.

T2 Beam Laser Crystal :

Aurora : +80% to optimal range, -75% to weapon tracking, 8 total damage. Good when you really want to snipe at extreme range for your ship size, but with low damage.

Gleam : -75% to optimal range, +25% to weapon tracking, 14 total damage. Basically it allow your beam laser to play like a pulse one.