Point light source is usually led by a UVLED lamp bead, forming a point light spot, known as point light source.
Line light source generally by many UVLED lamp bead (also but integrated chip) line up, glow, form line shape light spot, call line light source.
The surface light source is arranged by several UVLED lamp beads in different ways, forming multiple rows and columns and giving out planar light spots, which is called surface light source.
At present, point light source and line light source have been widely used, mainly because of the low cost and no technical difficulties.
Face illuminant is different, lamp bead is more and integrated together, heat dissipation is a big problem, lamp bead is too much, drive also is a problem.