Led Lenses glass narrow / small beam angle for Nichia UV Leds,  such as NVSU233B-D4 (3.5 X 3.5 X 2.73MM ), NVSU119C ( 3.5 X 3.5 X 2MM ), NCSU276A ( 3.5 X 3.5 X 2MM ), NVSU233A-D1 (3.5 X 3.5 X 2.73MM )