sentences:  LED sources are compact, which gives flexibility in designing lighting fixtures and good control over the distribution of light with small reflectors or lenses.Because of the small size of LEDs, control of the spatial distribution of illumination is extremely flexible, and the light output and spatial distribution of an LED array can be controlled with no efficiency loss.LEDs using the color-mixing principle can emit a wide range of colors by changing the proportions of light generated in each primary color.