To my knowledge, SSE has never had any lighting scheme other than the current one. It has multiple colors on it at the same time, but never changes colors like the castle has for the last ~10 years (which I've always found a little tacky)
When building SSE, they realized that it would be impossible to fully illuminate the top of the sphere without building enormous mast arms for the lights, which would ruin the view. To counteract that, they came up with the multi-colored scheme inspired by a Florida sunset, with warm oranges on the bottom fading to deep purples and eventually darkness. It's a clever and effective way to sidestep the limitations of physics, and nobody would ever imagine that it was anything other than what they always wanted
Here's a shot of it with the old sculpture in the entrance fountain. The colors appear slightly different due to the capabilities of film vs digital photography, but the effect is the same: