PAR20 stands for 20 denotes, which is the precise length from brim to brim of LED lights, or 20/8 inch in diameter, or roughly 64mm; PAR30 stands for 30 denotes, which is 30/8 inch in length close to 95mm; and PAR38, which stands for 38 denotes, which is 38/8 inch in length, or roughly 120mm.
