Elco EL993 4" Phenolic Baffle with Metal Ring Specifications: Lamp: 40W R16, 50W PAR20, R20 Outside diameter: 4.75" Compatible with the following Elco housings: EL99, EL99A, EL99ICA, EL99ICA-G24, EL99R, EL99RA, EL99RICA-G24