If you are interested in learning about the history of Iwasaki’s lighting technology developments, here is a video that has a timeline encompassing Iwasaki’s technological advancements in lighting:
https://youtu.be/1K3MYkjvMy8?si=4Eo57494NYwfhhYVI also find it interesting to learn that Japan was an early adopter of LED light fixtures starting in the late 2000s or so.
If you don’t speak Japanese, I recommend using the google translate app to automatically translate the text into English or any other language that you speak.
