Geometric parameters of the main reflector cup contains the following:
· Light Center and the top surface of the reflector cup distance H
· Reflector top opening diameter D
· Light through the light after reflection angle B
· Spilling bare angle A
· Irradiation distance L
· Center converging spot diameter E
· Spilling light spot diameter F

Geometric parameters as follows:
1, the dimensions of the main reflector H and D are determined in two sizes, H and D but also determines the fugitive bare angle A,
2, the spot diameter E, F is the beam angle B, A, and the distance L determined,
3, the most critical angle B is reflected by the reflector cup surface decision.
For the reflector, the reflector design is concerned, is to design reflection curve, the above geometric parameters H, D, B three parameters will determine the reflection curve, so the reflector, the reflector is designed only to provide H, D, B three parameters. Dimensions are based on the actual application of the product determined.