Pyeongtaek City has successfully replaced 457 sodium lamps with new efficient LED lights. Sodium lamps were 15 year old. Project cost 300 million won. It took 2 months. http://www.ggtopnews.com/news/article.html?no=195622

Munich, 24 September 2024 – SPIE, the independent European leader in multi-technical services in the areas of energy and communications, is upgrading the Heckenstaller and Luise-Kiesselbach tunnels on Munich’s Mittlerer Ring South-West...

Books are still my favorite source for professional development. I am busy in recent years also in tunnel lighting. I read many books, articles over past several years. I think this article is one of the best I read. IEEE is very much professional...

Solid British products. https://www.trtlighting.co.uk/products/?_sft_product-category=tunnel-lighting