New or little known multi-zone (Fresnel) zoom optics

[Agro]

Cross reference of a similar topic:

Any flashlight that has Led lenser zoom system

Recently i’m interested in Led lenser Zooming system their system can collect more light from the Led comparing to old classic zoom system i want to try one, more specific, led lenser p7.2, but its price is quite high for a 320 lumen light so, i guess there maybe a clone of this, at least, zooming system, i know it’s patented, but, well, i don’t really care (sorry if i offend anyone ) can anyone recommend one, my budget for this is less than 50 bucks thanks guy