Using an emmissive material on a coil is insanity in my opinion. It just seems like overkill for an interior rendering. Are the lights meant to be clear glass so you see the coil inside? If this is the case, I would just make a generic flat 2d piece in the shape of a coil to reduce the amount of geometry. If its not a clear bulb, I would just make an emmissive material on the bulb glass and use a bulb model with as few faces as possible to get the effect.
I would use omni lights along with rectagular lighting to get fill light and be aware, that the more lights in the model, the longer the rendering is going to take. For a production rendering, you are going to want to crank up the subdivisions on the lights also. I recently had some high detail interiors that used natural light along with omnis,IES, and rectangular lights and each view took 14 hours to cook.
