Sadly the Lightning is garbage. It's fragile and lacking in firepower by default, and the missile options suck. Skystrike missiles are only half an autocannon shot and taking a load of them gives you weaker shooting than a Thunderbolt on a less durable platform, and as insult to injury it costs MORE points. Tactical bombs are too weak to do anything. Hellfury missiles are decent, but force you to waste your other guns. And hellstrike missiles are just
FW's personal "

you" to anyone who buys a Lightning, thanks to the ordnance rule making all of your other shots
BS 1 (including the hellstrike missile if you fire two of them) they're worse than hunter-killer missiles and you're better off taking no missiles at all than attempting to use hellstrike missiles, even if they were free.
On the good side, if you got the old model with the long-barrel autocannon instead of the new missile-only one you might be able to count it as the far superior Avenger since it kind of has the same weapons (2x
LC, 1x big gun). If you're stuck with the new model the best you can do is glue four autocannons on the missile hardpoints and pretend it's a Thunderbolt.