The LEP Flashlights discussion thread - discuss LEPs here

[Xandre]

The small lens is just a Pre-Collimator to generate the Lumen
and make a bigger spot.

Teach me about pre-collimators

Pre-Collimators are small lenses which are placed above a de-domed LED to reduce the angle of the emitted light so that more of it hits the backside of the apheric main lens used in some flashlights. They increase the otf lumens by making the hotspot (when the light is fully focussed) larger. When defocussed the beam is generally a bit tighter, but the luminous intensity is higher. Also, when defocussed, there will be a donut hole in the beam. The size of this donut hole can be influenced, but n…

You can use it, or not.

At my Lep Modul,

LEP Modul

We bought 3 LEP Moduls from Ali and do some tests. It is written in German, but datas are international: Thanks @ sma and Andi Regards Xandre

there is no lens.

Regards Xandre