More than 99% of the light that comes in , comes out.
The throw can be influenced and even can be made very narrow, like a good reflector does, but without the same spill, so more energy can be put in the throw.
When you want to make an IR thrower for Nightvision , this optic comes in handy, even 1024nM is no problem PMMA can easily be scratched. It ... Read more
I bought this because I wanted to test some TIR optics to check out the beam profile for myself. And they are (for the pirce) of very high quality compared to some german produces ones I also bought elsewhere that cost more for 1 pce than 5 of these. Get me right - these are not as hogh qualiity as the german ones, but they are 1/10 the price! And thay ... Read more
Individually packed so they arrived unscratched. They fit on CREE perfectly.
The beam is very tight, the spot of maximum brightness is about 8 degrees from the main axis then there is some dimming out to some 12 degrees and thereafter rapid dimming. There is not much spill beam at all.
Efficiency seems good. Beam is not perfectly round.
Not much spill ... Read more
This is an good, low cost plastic TIR optic. The counterbored hole allows for the Cree's metal rim to align perfectly with the optic.
Unlike the previous reviewer, none of my optics arrived scratched. DX packed each one individually in a small ziplock bag, then rebagged all five in a larger ziplock bag, followed by a bubble envelope for shipping.
I ... Read more
Large diameter with wide lip that can be trimmed Cavity too deep for many types of LEDs
All 5 optics were scratched because they were packed without padding in a small zip lock bag
Large flat bottom that is only good for revealing the type of LED installed
Sides at wrong angle; does not seem to reflect well The LED cavity is very ... Read more
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