Luxim Corp., a Sunnyvale, Calif.-based developer of energy-efficient lighting technologies, has raised $21 million in additional Series D funding. The round total now stands at $39 million, which brings the company's overall venture capitalization to around $61 million. DAG Ventures led the new round, and was joined by return backers Sequoia Capital, Crosslink Capital and Worldview Technology Partners. The news was first reported by VentureBeat.