SINCE 1828
focus lamp
nounDefinition of focus lamp
1
: an incandescent lamp having a filament coiled or crumpled into a spiral or zigzag form so that the light, being concentrated in a small space, can be brought into the focus of a lens or mirror
2
: an arc lamp with feeding mechanism so constructed as to keep the arc in a constant position with reference to the optical system by means of which its rays are focused
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