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There is a rainbow/halo around the light projected on the screen?

We put a new bulb in the overhead projector and now there is a rainbow or halo around the light projected on the screen.
Kris G, January 2010
The bulb is not to blame. This unit has a defective light tunnel. It may have just finally broke when putting the bulb in.

Infocus - helpless customer, January 2010