Back in FS1 the Galatea was destroyed by the third beam salvo. I think the double-LRed hits are still enough to take an Orion out in FS2 with the same number of hits.... I'll try and report back in a few minutes.
Also remember that the GTVA equiped their capital ships with beam resistant armor even back in FS2 times, 18 years before the Blue Planet time.
Edit: Seems we were both right to some degree..... With two LRed the Lucifer takes a Orion down to 10% with two salvos, the third kills it. BUT the standard FS2 version of the Lucifer is equiped with SRed....
And I mixed up the beams of the BP Lucy. It has HRed in the forward arms and LRed in the side slots.
Those do more damage than the LRed, but due to the longer cooldown time they seem to have the same damage per seconds potential as the LRed on Medium.
Since the mod's gonna have the stats taken from BP, not vanilla FS2, the Lucifer will pack a big punch.