is a Maverick Sun D Lux LU600-D Digital 600w HPS horizontal or vertical?

http://www.amazon.com/gp/product/B004KSRNHQ

I can't tell or seem to find the information anywhere. I think about a week ago I saw something that said it was universal, but I can't find that now.

it goes both ways...

one clue, see the little supporting wires on the internal element, keeps it from hitting the glass when its horizontal or takes a bump

thank you sir