ASML's EUV moat is hard to replicate because making EUV light is only one part of a production tool: sustained fab uptime matters, and Zeiss optics are the harder moat. Langdao Silex showed a Chinese light source with 90% local components but disclosed no power figure. ASML's production sources run at about 600W; its February demo reached 1,000W with a path to 1,500W. Langdao staff put mass production three to five years away. x.com

