Oh, and the nuts that come with it (for hanging) are square, metric size M4. The official Giesemann hanging kit is no longer available in the US, and shipping from Germany is over $75...I have this light... Non-dimmable, and each T5 pair (front and back) has a power cord - they end up on the same side of the fixture. I got the extension endplates and longer light mounts and the distance between the banks is 12". I like it