Went into a Mennonite-owned quilt store in/near Harrisonburg, VA, last year where they were using these and I was astounded how brilliant --- as in light intensity and in intelligence!!--- they were! I went home with a brochure about them, which I have now misplaced darn it.
IF I were to ever build a place I'd use these things for sure. The store automatically switched to electric lighting when there was not enough sunlight. COOL!
Jan in VA