Its seems that they are used with LEDs only so I decided to post here. How large are TIROS optics? I recall a thread where a guy had a single one of those. Does anyone have the link to that thread? Also where might I be able to buy these?
As far as I know, they're not for sale individually. Get an XO and disassemble it if you really want thos specific optics... not all that econonical at ~$40 each.
There is a difference between referring to a specific product made by one manufacturer (TIROS) and the whole class of Total Internal Reflection (TIR) optics in general of which there are many, MANY kinds. I've seen a few posts making this mistake.
If you want a TIR optic available on the market by itself without having to rip up a light, check out the NX05 (one of the most famous), and the Fraen LP at the Sandwich Shoppe.