I don't know the manufacturer as the label dissapeared years ago! This was a vain attempt to save on lighting costs at my high school. These were installed in the front office , one hallway and a couple of store rooms (this was "borrowed" from one of the store rooms !) These replaced a mixture of 135w A-21's, 150w R-40's and 120w PAR-38's in surface mount cans with flat black interiors. ALL of these and the cans were replaced with 2X2 surface mount fluorescent fixtures with either 2-6" leg or 3-3 5/8" leg u-bend lamps ( the 3 lamp units were used to replace the cans with 2 lamps inside, one for the standard light and the other for use with the generator system ) THESE WERE A VERY DIM, DUMB IDEA !