Unless it's got the IR listed below I'd say it's this one.
Originally Posted By: HTRN57Since it is now the off season and I have a little more time to work on projects, I can convert pretty much any T-20 out there to the rheostat tailcap switch for $50 (includes return shipping). This conversion will also include the new Osram 4715AS IR 850nm LED rated at 1,400 millampere (mA) since the 3 mode LEDs will not work with the rheostat switch. If anyone wants one converted just send it to me with your check or cash to:
High Tech Red Neck, Inc
14236 Hillcrest Lane
Rushville, IL 62681
Please also send me an email at hightechredneckinc@gmail.com so I can keep track of what is coming and going.
Thanks, Kevin
It's not so much the light as it is the components in the right configuration. You can only drive an LED so hard.
The difference between a T20-50-66 is the size of the lens. The bigger the lens the smaller the focused area. When driven the same none of those lights produce more lumens, they just focus those lumens in a smaller area creating more throw. That's how it works with visible light, not sure how to quantify IR light or measure it but the optics work the same.
With the bigger lens you look at a small square of focused LED light smaller than the FOV of your scope. I don't like running my red lights or my IR like that I back it off so it fills the FOV of my scope. In doing this you're no longer squeezing all the throw out of a light. It would be an interesting comparison of those three lenses to see how bright each one is when it fills the FOV at a given magnification and distance.