Try out:
Go 21/6/3 (he already has high base-health, the +3 mana/5 helps him tremendously)
Replace 3 Blues with Scaling Mana Regeneration (you can afford to lose 7MR@18)
GwingMaster2 votesCAST ALL OF THE SPELLS, BWAHAHAHAHAHAHA. Seriously though, i tried out Lucian a few weeks ago (admittedly I'm awful at adc, but w/e) and thought he was pretty weak. This build actually looks pretty beast though - the Muramana proc-ing on both passive shots sounds very strong. NJ dude, might give Lucian another try now
Eyrgos1 votesHehe, it's worth a shot. He's all about Spellweaving (passive-procurement) & On-Hit... this build is godmode on him if you become skilled enough with him. Definitely takes some practice.
HippoBlaster50001 votesThis looks pretty standard except for the muramana. Whats the reasoning behind the 
?
In my experience Lucian doesn't need that much mana since even with max CDR you aren't able to spam your spells fast enough to deplete it fully in a team fight. Also, since muramana has an on hit modifier you're better off using it on a more autoattack heavy champion, since Lucian's passive only procs muramana once.
I generally find that once I get a 
my manna issues are fixed.
Eyrgos1 votesHe's 100% about passive-proccing via casting and on-hit effects; he's effectively a spellslinger.
With max CDR and Muramana plus TF, you're essentially able to leave Muramana on at all times. Additionally, it gives superb attack-damage at this point as well. Besides, the damage-proc DOES occur twice with his passive. AND Muramana deals more damage the more mana you have remaining in the fight, so the point of not being able to deplete it is kind of null (it's damage is based off %current mana & consumption)... BC synergizes greatly with it too as the damage is physical.
If TF is enough to fix your mana-issues, you aren't casting enough... your burst is entirely tied to your passive procs & spells. CAST MOAR.
cheekz1 votesThis sounds interesting. I'm willing to experiment with it. It's nice to see people trying different things. And no, I'm not going to force it upon unsuspecting normals, I'll check cost and gameflow first and see it the build is fluid and then check damage/utility/burst... Etc.
Kudos to creative kids. Thanks!
Kira Onime1 votesI'd replace 
with a 
or 
.
Eyrgos1 votesRead below. BC could be replaced with LW, but the additional CD & the proc synergize well with his kit (as well as Muramana).
Additionally, BoTRK & BT together in one build is wasted... if anything, like I mentioned, BT could be replaced with BoTRK.
TBirdUSA1 votesAs a Lucian main, I tried really hard on the PBE and the first few weeks of his release to use a build that wasn't the standard marksman build. Although some of them are quite fun, they simply don't pack the damage that the standard Marksman build does (by this I mean Beserker's Greaves, Infinity Edge, Phantom Dancer, Last Whisper, Blade of the Ruined King, and Bloodthirster with the option of a defensive item/Trinity Force replacing one/two of those).
Yes, Lucian does great burst, but I personally don't like building around it. My usual builds has a Trinity Force in it as I just love the item on Lucian, but that's about as far as I go into the burst Lucian idea.
With that said, I have nothing against the build. It's a lot of fun (I've tried a similar build a number of times) but it isn't what most people expect from a marksman. I wouldn't be surprised that if you run this build in Solo/Duo queue you are going to get some flame, so I would tell your team so they can mold their choices/builds around it accordingly and not be surprised when they start checking out your build.
klorinator1 votesThe main problem with this build is that it's too weak early for me. I prefer to build strait into triforce, also weak early but not as weak as having a tear.
Eyrgos1 votesI go BT>Tear>TF