PLL2251 Series
SQUARE Optical Systems with 25 Lenses for 3535 package LEDs - 74.90mm x 74.90mm side - from 9.40mm to 9.82mm height

KNAC04ASM Series
NACTUS SMALL Optical System with 4 Lenses - 50,00mm x 50,00mm side - Lens pitch 25,40 mm

KESQ2145SR Series
Silicone Single Lenses with Self-Adhesive tape - 21.60mm x 21.60mm side - 12.86mm height

PL1672 Series
Single Lenses MR11 Standard for Power LEDs - 35,00mm diameter - from 20,71mm to 21,46mm height

PL1303 Series
Single Lenses for Power LEDs - 31,00mm diameter - 18,31mm height