I just finished my GT mini with D1S reflector yesterday and I can’t go above 255,5 kcd with the OSRAM KW CSLNM1.TG. I tuned the focus for hours. Measuring every tiny bit of change. With Black flat it was 213 kcd. I just can’t understand how can it be 340 kcd. And 300 with C8? How?
It’s better to calculate beforehand (using the Luminance, the reflector diameter and accounting for losses) instead of believing other people’s measurements which you can never trust 100%. How accurate are your own measurements?
My GT mini with dedomed XP-G2 S4 2B does 235 kcd, so there should be some improvement with this new led, unless the small led is so finicky about reflector perfection that the bigger die of the XP-G2 is needed to smooth out the artifacts.
I’m sure you monitored that but for my peace of mind: you did measure that the current did not exceed 6-ish amps?
I’m using Sanyo GA cells to not reach 6A. Even tried GA cells at 4, 3.9, 3.7V but not much difference. It was between 800-892 lumens. I measured around 300 lights. Around 200 in my tables. For cd reading I read distances from luxmeter with laser distance meter. I don’t know why is the big difference.
It’s hard to compare different people’s measurements, there will always be variability between them at play. What’s noteworthy is that you got a 15-20% improvement in performance with the White Flat over the Black Flat.
Ok yesterday was a big rain and I took measurements right after that. So Air has high humidity but not that high to make 90 kcd difference.
The black flat was not perfectly focused. The white flat I think is in the best I can get because I raised the centering ring with kapton tape layers and took measurement after each layer until it started dropping in kcd. I done the same with my GT and I got it with 903 kcd and managed to bump to 1174 kcd with that method.
Or maybe my luxmeter reads low compared to others.
So led4power@led4power.com has this:
https://led4power.com/product/new-osram-kw-cslnm1-tg-1mm2-throw-king-16mm-xp-dtp-mcpcb/
Easy to mod and it will throw like hell!
Djozz showed in his luxmeters tests how huge variation between various luxmeters can be, so all BLF numbers are questionable, at least until we (BLF) find or make "BLF luxmeter". Only then comparisons would make sense. How hard is to accurately measure light can be seen from tolerance given by LED manufacturers - 6-7% is common number, and they have multi-million $/€ equipment.
^Agree. BTW I will buy Maukka’s calibration lights and correct all my numbers in my tables according to that.
In what distance did you measure the light? 1m is definitely too close with such a small led and such a large reflector.
1, 5, 10, 15, 20, 25m
You can’t catch Zozz on not being thorough 
For the record, I always said that my numbers might be WAY off…
That said, the Black Flat in a D1 IS impressive once it’s focused properly 
For the record, I always said that my numbers might be WAY off…
That said, the Black Flat in a D1 IS impressive once it’s focused properly
My M3XS turned into a light saber with it too !
People want to talk about humidity having such a big impact, and I’m sure there is some impact as the air is so much more dense, but I got a 1.41Mcd reading at 50M with the new MaxToch XSword and it only makes 370 lumens… it was actually raining lightly at the time!
Color of tint can actually impact the throw number, as can humidity. Or the meter. Or the strength of the cell in the meter.
The only constant is the variables. 
I have a Black Flat in one of my D1S’s and don’t particularly like it, will be going back to the XP-L HI probably today.
ZozzV6
Please try this… Take those wet tissues. Clean that plastic white lux sensor plastic (first cleaning move). Wipe with clean microfiber cloth or dry tissue(second cleaning move). After that try to measure again. You could be very surprised…
I am in for BLF luxmeter special edition… They can be calibrated by you for example :+1:
Nice!! That’s an intense beam.
We first have to find an affordable luxmeter that has an acceptable spectrum sensitivity accuracy, before even considering doing the special edition calibration thing.
That cheap Tasi meter could have been a candidate until I found out that they sell cheaped-out versions of the same luxmeters now that will certainly not be good enough.
I vote for that UNI-T UT383. Maye it ain’t most accurate one but it is easy to use especially when I need to mount it on ceiling lol (I only do that when centering reflector lights).
But yes.
It is good idea for someone willing to take group buy. I think that you are right man for that job Djozz… Some budget light meter with consistent but maybe not so accurate results which will be calibrated by you to certain acceptable values. But it needs to stay in budget segment.