All you have to do is put a piece of very fine grit sandpaper on a flat surface, place the black centering block on it, & rub until you remove a bit from the bottom of the block.
It should be/is very easy to do that in an even fashion. As far as causing any other blemishes, I cannot understand how that would be possible using this method.
I did it with one of mine & it was simple as well as straight forward. Seemed to tighten the hotspot a bit also.
To make clear what I mean I took a photo of both the GT and my Boss. The first photo is the GT. It clearly is brighter, but there is a lot of light around the hotspot. IF it was possible to concentrate that light, it would improve the beam.
This is a beamshot of my Palight Boss with a dedomed XP-L V6 1A. There is very little light around the center. If only I could make my GT throw the same.
@ johny723 ……. OK…… I think I now understand what you are saying. I do not think this is possible with the GT reflector / LED setup. It was designed to spill this amount of light so as to be a more “”useful”” light.
This is what I remember anyway.
I measured my friend’s GT too only swapping the head and his got even worse numbers than mine. The batteries were fully charged and his GT only pushed uot 894 Kcd. Mine does 980 Kcd again but interesting the different results at different distances.
We both got our GT in early March and they travelled together according to changes in tracking had only few minutes differences between the two lights. So I think they are same manufacturing batch got not so throwy. I need to get a strap wrench or something and then try focusing.
I managed to open my GT head with a leather belt
I printed out Enderman’s focus checking circles with the 3 square. I have still my friend’s GT too so I checked both. Mine was good for about 1m distance and then started to seem over focused. The 3 square moved to the center. At 7-8m the 3 squares almost completely overlapping each other. That is why I got the biggest numbers at 10m because it was focused around that distence. My friend’s GT was even worse. As we seen in the intensity numbers too. So I need to sand the centering plate thinner. I needed to go to work so tomorrow I will measure centering plate thickness and sand it down a little.
you don’t see it on a beamshot. Maybe with the focusing templates you can see the squares but with naked eye I don’t think so. But I will try to make photos.
I can try but you will don’t see much I think. These are not huge differences just hunting for the perfection. If I can manage to focus better and make 1100 kcd from my 980 kcd it is not what you can notice in a few meter wall beamshot.
Just tell us if sanding down the centerpiece improves the hotspot at larger distances. Especially if it can remove the corona and make the center brighter.
I have some results! My theory was a bit wrong. The centering plastic wasn’t too thick. It was thin. I sanded down from 2,5mm to 2,33mm and it made worse. I only got 874 kcd from the stock 980. So I started placing kapton tape stripes to the bottom and about every 0,1-0,15mm added I reassembled the head and went outside to measure lux at 10, 15, 20, 25m.
Today’s last result was 1100000 cd at 20m with 3,17mm thick centering plastic. This is not the end and I have pics and a lot of numbers. The interesting that as it was getting better the highest number moved to the bigger measuring distances which I think is good because the beam is more parallel and forming the hot spot farther is good. Tomorrow I have a lot to do but I think I will add some more tape under that centering piece and I want to find the best focus setting. And I will post all the pics and numbers when Im done.
Stay tuned!