I just put white flat into my SR95S UT, Vf measured 3.28v, a little bit above my target 3.25v.
Compared to my BLF GT at 30 meter just now, it is 725kcd vs 938kcd, about 835 otf lumens.
It is not easy to get it focus precisely, and i didn’t aim for perfect focus to save myself from OCD cycles.
It is quite white not as blue as picture shown below.
I would say it has same or slightly better performance than his smaller brother but at much higher currents… Seeing is believing… I believe what I see and what I build… New Osram White flat 2mm driven at around 9A has same performance as smaller brother but that is in first 10 seconds… I am not doing 30 second test like Djozz…
So yes it is quite possible that at 6A Osram White Flat 2mm equals in performance with old g2s42bdd…
So I will repost again Mine redneck test of Osram White Flat 2mm.
Fully charged Samsung INR 30 Q. Single cell 18650 light with FET Djozz driver. around 5-10 seconds on lux meter.
4.2V, 13.4A, 930 FC
4.0V, 12.5A, 950 FC 950FC same performance as XP-G2 S4 2B DD driven at 4.7A.
3.9V, 11.4A,1050 FC
3.8V, 10A, 1250 FC
3.7V, 9.20A, 1200 FC
3.6V, 8.20A, 1150 FC
3.4V, 7A , 1100 FC
So as you see I got best performance somewhere around 9-10A…
So of course it could equal in performance with G2 at 6A current draw but it surely has potential to beat it up in right host…
This obviously ain’t emitter for mine FET single 18650 builds but it should be OK for any chunky regulated multi cell flashlight. I recommend 9A or slightly more current draw if you have proper host that can transfer all that heat properly…
At really high powers I get worse performance than others on my led tests too, and I’m thinking that one possible reason is a slightly thicker solder layer than others. I use no solder stencil, and when after melting of the solder I push on the led a slight bit of solder (by no means thick blobs) can be squeezed out so I do not use the absolute minimum.
I don’t know what to say? I always used a little bit more solder paste on XP-G2 S4 2B put I pushed excess off so it got those solder blobs on the side like in pics… Performance of last XP-G2 series of emitters I got from Hank is very consistent too. But since XP-G2 gets naturally sucked in it is really no problem to push excess solder off.
About reflow… I do slightly modified Old Lumens method.
Hakko 936, Largest round flat Hakko tip, and 320 celzius temperature on soldering iron.
Tip is dry(I am not using any solder on it) and I just put it below mcpcb which is held by vise (that small Proxxon vise which has that rubber protection for vise clamps so heat can’t be transferred from XP board to metal clamps of vise, all heat is concentrated in XP board for fast reflow…
Cheap mechanic solder paste but the model with needle application and thin hollow needle( in fact it is very hard to squeeze it through needle, bodybuilder skills needed for that lol )
5-10 second and it is done.
For white flat I really use thin application. When it reflows I gently move White Flat with toothpick (spreading solder, and centering).
Did I told you that with L4P boards I have greater gain with FET driver than with Noctigon or Maxtoch board?
I will give you true figures. You know that I use XPG2S42BDD exclusively so following are real figures I was getting before I got L4P board, and I will admit that after I received new L4P boards I contacted L4P and told him that his L4P board looks like crab when I compare it to Noctigon(you know thickness, gold plated etc.), and that I am bit disappointed and then when I tested his L4P DTP I just felt ashamed cause it killed noc and maxtoch in performance. :FACEPALM:
MaxtochDTP - the fattest one used for SupwildfireMitko model DTP= 4.2A (well sometimes 4.3)
Noctigon DTP= 4.4A current draw
L4P DTP = 4.7A current draw
So here is one more reason why we may getting different results.
L4P even explained why such differences among DTP may occur but I can’t find that post.
djozz, are you going to do an output test of the 2mm^2 white flat? I bought 4 from mouser and can do an estimated output vs current measurement, though luminarium’s numbers give a rough idea of where the peak is. I will also put it in an EE X6 head and measure the throw while powered by a constant current supply.
For me the real advantage is the very low Vf. I plan to put 4 of these in my C8 quad. A single cell will drive them pretty nicely I think.
Thanks for offering doing the test but I wanted to find out myself too now.
Reflowed a new led on a 16mm L4P DTP board, using enough but sparse solder paste, clamped it well and flat onto the test mount with bit of AS5 in between, and this is what I got:
So in my emitter test set-up I find the led peaking lower at 7.5A, and not at 10A as l.i. found. It may be my reflow, it may be the amount or type of my solder paste (same chinese 63/37 solder paste that many use), I don’t know.
Regardless, even in my test this led puts more light out than the XP-G2 S4 2B (the led from the test is not even dedomed, substract 10% output for after dedome), with a maximum output of over 1500 djozzlumen (probably about 1400 real lumen), which because of the low voltage can actually be reached in a single li-ion flashlight (unlike the XP-G2 S4 2B, that you will not get over 4.5-5A).
I do not know why I did not get better performance in my mini-GT, even though I thought that I had done the mod well, but as said before: so many variables…