They probably put one of the electrode tips (which have a much higher luminance compared to the center of the arc) into the focal point of the reflector.
Unlike with xenon or mercury short arcs, HIDs have a pretty uniform ark intensity.
This is why the medium size spot has very even brightness.
I don’t have any wall beamshots to show it though.
It still makes a noticeable difference. There is a German doctor thesis on this topic where the distribution was measured.
https://depositonce.tu-berlin.de/bitstream/11303/1373/1/Dokument_33.pdf
The electrode tips have more than 2x the luminance of the center of the arc, but they are small! One needs a rather precise reflector to focus on them.
The Lemax LX70 is focussed this way for example.
Oh I see, yeah, but with the hellfighter I don’t notice much higher intensity at the edges of the spot, which is where the other electrode is.
Still, the reason the center spot is so bright is because the “donut” produced by the reflector is overlapping in the middle.
The non-overlapping light is what produces the second larger spot.
Yes! Huge light powered by LiPos in a Pelican…So much awesomeness! Can’t wait to this progress.