light question (semi off topic)

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From: Judy Seigel (jseigel@panix.com)
Date: 01/14/03-02:26:32 PM Z

What happens when you block off a portion of a light bulb to prevent the
light from going in a particular direction? I figure someone on this list
will know... the question came up in another context, the issue being, is
electricity wasted, or does ALL the light just get pushed in the other
directions?

And would all bulbs act the same way? Sodium vapor, halide, other?

thanks in advance for any enlightenment....

J.

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