New Delhi, Sept. 1 -- India's deeptech startups are beginning to reach a stage that was largely out of bounds for traditional growth investors: they have established revenue streams, some evidence of unit economics and are starting to grow in a more stable way.

The shift is also showing up in larger cheques and a broader mix of investors entering the sector, according to industry experts, even as growth funds confront the difficulty of evaluating businesses with long development cycles and technical risks.

"Today there are more of these businesses that have established revenue streams, showing some unit economics, and are now starting to grow in a more stable way," said Dushyant Singh, managing director at Playbook Partners, a sector-ag...