Indoor lighting fixtures, usually classified according to the distribution ratio of the total optical flux in the upper hemisphere and lower hemisphere of the space. The International Lighting Commission accordingly recommends: the illumination lamps are divided into direct, half direct, homogeneous diffusion, half indirect and indirect five kinds. The following table is the light distribution and illumination characteristics of different types of luminaires:
Outdoor lighting lamps, mainly floodlight. The floodlight, also known as the projection device, is a strong light source by using mirrors, transmission mirrors, and grating to constrain light in a small stereo angle, which is often used for large-scale building nightscape lighting.