FWIW because these are rough calculations, I did an as good as it gets output measurement of the bare led in the GT, while it was at 1.86A, and got 2070 (djozz)lumen. Koef3’s measurement of a C4 bin XHP35 Hi at 1.86A is 2050 lumen, but my lumen compared to Koef3’s lumen at the (Mouser-bought) LuxeonV test (that we both did) is 11% higher, so in his calibration my GT would put out 1865 lumen at 1.86A, which would place my led in a C2 bin.
These calculations are so rough that they hardly have value, but suggest that my led is not faulty but seems another aspect of my GT that is on the low end of expectations, but not so low that it alone explains the low-ish throw of my GT. I do not rule out that the reflector is still partly to blame.
A handle for the shorty configuration was also in the planning so I went on with that. Because I was still a bit disappointed in my inability to improve my GT (performing like a 100mm reflector light while being a 120mm reflector light), my motivation for making the handle really nice was also affected, and I chose for some simple bends in a strip of 4mm aluminium and for a quick engine paint job instead of trying to anodise the handle. The handle works beautifully though, very well in balance. But the switch is of course on the wrong side of the lamp.
Hmm, that is very strange results djozz. My first guess is that you have an abnormally high Vf LED and it is reaching max power even without turbo being enabled. Due to the buck design the resistance would not be lowered any further by going into turbo.
In this case it having abnormally low output would not be a stretch.
My first change would be an LED swap and see what happens. The reflow is a very real option as well.
I had a case like this just a few weeks ago where I reflowed some XHP35’s in an MT09R and they got good output at first but then after some use the output quickly started falling. No other explanation, they just simply started preforming very badly.
Put some new XHP35’s in the light and it worked perfect.
Of all the Cree LED’s I have worked with I would say that the XHP35 is the least consistent of them by a fair margin. No idea why but I have seen surprising variances even in the same reel.
Oh and I am not sure there is a market to make a big batch of drivers for the XHP70.2 GT at this point seeing as the mcpcb is still a custom mod, so I just have my leftover prototype drivers available to sell.
I currently have 4 of them ready to ship, if anyone is interested PM me.
I also still have 1 XHP70.2 GT left ready for a new home.
Hi TA, I have not followed your mods very well but for using this XHP70 driver I guess the battery configuration needs to be altered to 6V instead of 12V?
Btw, I measured the voltage drop of one of the carriers while at 2A current, using 4 aluminium blanks in the carrier of exact the same length as a buttontop30Q, and I measured 0.2V voltage drop from the resistances inside the carrier.
0.2 V drop over 12V is not very significant so that is :+1:
Nope, that was the point of this driver, it works at the native 12V the GT comes as.
All you have to figure out is the MSPCB (the best option right now is the sinkpad 46mm aluminum mcpcb that can be sanded to fit or a modded SD75 mcpcb if you can get it), Or wait for lumintop to hopefully release a pre-made MCPCB for modding the GT.
Then drop in this driver and it is good to go for over 9k lumens (I saw over 10k for a few seconds).
Yes, and there’s more of them in the house, my son is particularly fond of cactuses. You just gave me an argument to sell the flashlight hobby to the family
i did the first steps with my BLF GTA (Giga Thrower aspheric) Aiming to kick the Optofires ass which uses a 120mm lens as well. The light already fires up, but is bad focussed at the moment. Quick and dirty put together for a first measurement. I measured 1.7 Mcd (8metres) already - without the Wavien Collar.
Aiming to kick the Optofires ass which uses a 120mm lens as well. The light already fires up, but is bad focussed at the moment. Quick and dirty put together for a first measurement. I measured 1.7 Mcd (8metres) already - without the Wavien Collar.
