These optical modules are made of ultra-clear silicone, consisting of twelve optics with 25.40mm lens pitch. Engineered for 3.5×3.5mm Power LEDs, they also fit 5x5mm package LEDs. Three beams: IESNA Type II/ III /V medium cutoff. IESNA Type III optics also meet ME3A requirements. Designed to comply with IP65 rating and IK10 rating (20 Joules). No glass cover is required. They system boasts high optical efficiency, great temperature resistance, non-yellowing effect and also available with holder in PC, on request.