ok I have this hare-brained scheme to make a lightbulb that is etched or "reliefed"
with a height map of the Earth.  After 2 days of experimentation, I am at wit's end.

The lightbulb should be lit, and used to cast a little radiosity light, but I still
want to see the relief of the Earth.

I have tried using bump-maps with variations of bright colors (rgb .75 to rgb 3) and
high ambient (.75 to 3) and I either get what looks like a dull white avocado or it
washes out all white.

Any ideas?

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