Does anyone have any ideas on how this can be achieved?

I've been through the other tutorials on this site and I'm going great guns building rooms, doors and implementing basic lighting but curse my creative brain - I've created a room that'll look awesome with a rotating red emergency light!

I've got a red light shining beams out each way along the Y axis and I'm trying to jimmy the principles outlined in the rotating door tutorial but with little success. Any help will be appreciated.

Cheers,

I also have a light related question. When I hit J after just adding a light entity, the light editor doesn't come up. Anyone know why?