2nd line is not production line but kiran hanger converted into production line which only produces just 3 aircraft.
CCS approval is required anything above 1000 crore, cost of 2nd line is Rs 1,500 crore.
Hal will produce 16 tejas from these two production line, plus 3 extra tejas from Converted kiran hanger line.
Total 8 + 8 + 3 = 19 Tejas per year.
I am just going by the tweet bro, it designates this new line the 3rd production line(2nd being the converted hanger) but you consider it the second.
Either way we are talking about the same thing- the 2nd full-blown production line.
19 LCA/year by 2020 will be a pretty spectacular acheivement if HAL can pull it off, there will be scope to increase this yeat further by raising outsourcing from 60% (current target) to 80%, then from existing lines HAL could be churning out >25/year.
This kind of capacity augmentation truly suggests >200++ LCA will be ordered.