Installation is simple with one exception: then clipped into the housing a reflector is attached, then inserted above the fluorescent tubes above the grid. Aufrgund the low level everything is a bit tight and if you do not fastened to the reflector accurately plan (which is difficult because it is attached with two dinky metal tongues), the grid snap is not a right.
The starter has a short delay and there in the first few seconds a slight hum. I have a number of these lights and is in every way. I have already experienced better in many offices.
Due to its excellent price-performance ratio still 4 star.