Since only 2 of the weapons on the Advent Starbase are visible I wanted to change the last one so I could actually see it. However it is proving tricky. What I did was to copy the effect of the LongRange frigate (advent) and copied it into the Laser weapon effect in the Advent Starbase. It looks like this:

Weapon
    WeaponType "Projectile"
    damageEnums
        AttackType "CAPITALSHIP"
        DamageAffectType "AFFECTS_SHIELDS_AND_HULL"
        DamageApplyType "OVERTIME"
        DamageType "ENERGY"
        WeaponClassType "LASERPSI"
    DamagePerBank:FRONT 520.000000
    DamagePerBank:BACK 520.000000
    DamagePerBank:LEFT 520.000000
    DamagePerBank:RIGHT 520.000000
    Range 6500.000000
    PreBuffCooldownTime 6.000000
    CanFireAtFighter FALSE
    SynchronizedTargeting FALSE
    PointStaggerDelay 0.200000
    TravelSpeed 4000.000000
    Duration 0.000000
    fireConstraintType "StarBaseUpgradeLevel"
    requiredStarBaseWeaponLevel 1
    WeaponEffects
        weaponType "Beam"
        burstCount 1
        burstDelay 0.000000
        muzzleEffectName "Weapon_PsiCapitalBeamMedium_Muzzle"
        muzzleSoundMinRespawnTime 0.100000
        muzzleSounds
            soundCount 1
            sound ""
        hitEffectName "Weapon_PsiCapitalBeamMedium_Hit"
        hitHullEffectSounds
            soundCount 1
            sound ""
        hitShieldsEffectSounds
            soundCount 1
            sound ""
        beamEffectSounds
            soundCount 1
            sound "WEAPON_PSICAPITALBEAMMEDIUM_TRAVEL"
        beamGlowTextureName "PsiCapitalBeam_Glow"
        beamCoreTextureName "PsiCapitalBeam_Core"
        beamWidth 20.000000
        beamGlowColor ffffffff
        beamCoreColor ffffffff
        beamTilingRate 3.000000

However its still not visible. What I am doing wrong?