BENGALURU : Lightspeed Venture Partners is in advanced discussions to lead a $30 million funding round in SolarSquare, a rooftop solar startup, alongside other investors, two people familiar with the matter told Mint. The investment follows a $4.2 million round raised by SolarSquare earlier this year from investors including Zerodha’s Rainmatter Capital, Gruhas Proptech led by Zerodha co-founder Nikhil Kamath, …