Lumentum's valuation is supported by Nvidia's co-packaged optics scale-out progressing faster than expected. Spectrum-X CPO switches are in mass production on better component yields, with shipments forecast at 15k in 4Q26 rising to 100k in 2027. CPO and NPO are seen contributing 12% and 26% of Lumentum's revenue in 2027 and 2028. Scale-up optical engine estimates were revised to 6.5m and 42m for 2027 and 2028, with full NPO adoption for the cycle retained. x.com