Hello,
I used to grow with HID lights (250W) HPS+MH Philips bulbs with Lumatek dimmable ballast in grow tent Secret Jardin Dark Street 2 (60x60x150 cm) or (24x24x60 inches) for US :)
I was growing 4 photo period plants under the SCRoG. (there use to be a lot of mess there but i like that way)...