Light sources in the field of research refer to various sources of light that are used in scientific experiments and investigations. These sources can include lasers, LEDs (light-emitting diodes), incandescent bulbs, fluorescent lights, and more. Light sources are essential in research for illuminating samples, conducting experiments in optics, spectroscopy, and microscopy, and for various other applications in physics, chemistry, biology, and other scientific disciplines. Different light sources have unique properties and can emit light at different wavelengths, intensity levels, and polarization states, making them suitable for specific research tasks and applications. Researchers often use a combination of different light sources in their experiments to achieve the desired results.