The 26.5 mm range of LED lenses from Carclo Optics are TIR lenses which create narrow beams from compact LEDs. These round TIR lenses can also be used with larger LEDs and even multi-die LEDs. Available in a range of different beam angles, this range can provide drop-in replacements within the same sized optics.
Carclo Optics' LED lenses have been designed to work with a range of different LEDs from different manufacturers. Please visit the Carclo Optics website for the current list of compatible LEDs.