Ceiling light (Horwich BL6)

Sorry there's no photo of it in situ. It's a flush to ceiling light. The backplate screws to the ceiling and there are the usual 3 wires to connect to the supply - very straightforward. It has 2 x 9W energy saving bulbs in it (both working). The outer area of the light cover is opaque and the inner area is covered by glass beads. We've had it a few years and it's been good but we now need a stronger light and so it's been replaced. It'll be fine in a smaller room/bedroom. The outside glass has a 41/42cm diameter.