You have more than a few options for doing this.

First off, do you really need a light to do what you want to do? Do you want the object to glow, or glow and light the room? Because that makes a huge difference when trying to do it with a light.

Do you actually need a light, or do you want a shader to fake more than one thing at once?

Let me give you an example of what I mean. Here is a very simple way to make something, transparent, an emitter, and not blow out the light on the actual object.

This example is in Superfly.

Notice that the room is lit entirely by the object, the sphere is transparent, and the light it emits is not present on the surface of the object, blowing it out. You can change the factor settings to adjust the transparency or translucence, or both at the same time. And you can control this with textures if you want a different look, but the entire trick to this is the lightpath node hiding the emission on the sphere from the camera. The sphere appears to be lit from the inside, but there isn't a light in it, and it is casting bright light into the room, that is not visible on the object.....

No additional light to move around, all done with one object.

To go one step further, you can duplicate the sphere, scale it down, adjust y height to center it, and then you have a second object that can appear to be a light inside it... Obviously the inner sphere could use a far simpler shader as well. or just use the same one set up differently.....

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