arc lamp 
(also arc light)
noun
A light source using an electric arc.The excitation source, a xenon arc lamp, provides a white light beam that is sent through a bandpass filter and reflected into a microscope objective through a dichroic filter....
- In a series of experiments he showed that radiation from an electric arc lamp can have much the same effect on skin as sunlight.
- As the group focused light from an arc lamp onto the back of the substrate, the absorbed light yielded temperature gradients at the surface of the fluid.