only energy saving ones I can think of are like
_____
I I <------ top bit
I----I
II II
II II
II II <------ long bit
U U

OK crap drawing, but the top bit has a screw attachment on, and plugs into a normal socket.

the 2 long bits are tubing, that curve down from one side, then up, so in essence is a semi circle or a loop or something.
would that be suitable?