Light is a terrible buff atm. I hyper-rolled and hit 9 Light, with a stacked Ashe with Taric Crystal synergy.
So basically 9 Light, 2 Crystal, 4 Rangers, and yet I still got crushed by the 3 Olaf abusers, the blender abuser and the mage warden player.
I just think it needs a rework, cause you can't really buff it, and it's terrible as it is now, especially since all the units in Light have 0 synergy with each other. You have a Blademaster, a Berserker, a Ranger, a Warden, a Mystic, a Summoner, and now Lucian.
I feel like the only way you ever make Light good is by abusing Lucian+Senna, but even then, why run Light? Just run Wardens and Shadow units.
I agree with OP though, the comp does no damage, you're relying on another unit to win it for you, thereby meaning that 3 Light is the single best option to go with when running Light. Which then brings into question, why even run it at all?