I ordered some POM plastic to make myself some gaskets. All hand work and no fancy tool avaible. Its a little to loose in the reflector but I will make some more later.
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Got some good news for anyone wanting to swap the 1mm2 emitter into an MF-04. The stock isolation ring does actually focus the emitter quite well in this light. I finally got back to this light last night. I centered the emitter (trial and error when tightening the bezel. Once I got it centered, I was able to confirm focus. Atmospheric conditions are very bad right now due to extremely high pollen from pine trees. I will measure throw and get some beam shots after conditions improve. The beam is beautiful and clearly beats my BLF GT which I measured at about 1 million cd.
The tint is probably good, the older black flat was more reddish than greenish at high currents. The cri is obviously low (the only way to get max luminance), it should be stated in the datasheet. Probably around 65-70.
That was way back then. Now the XM-L2 version also 9mm. I got a 3 piece batch few months ago with XP-L HI and 7mm reflector holes and different centering rings but that was one time only. All others 9mm. L2 has the same 9mm centering ring as C8.
Hey gang, I’m trying to catch up on this Osram CSLNM1.TG emitter by reading through the majority of this thread. I’ll admit, some of the info is beyond me.
I have a clear anodizing C8 host sitting around I’d like to try out a Flat White CSLNM1.TG emitter in. But I have a couple of questions.
MtnElectronics lists the Osram CSLNM1.TG FLAT LED as “Neutral thermal path.” I keep reading that some of these Osram emitter are mounted on MCPCB’s which need to be insulated from the flashlight body. Is this true with this setup? Or has that issue been fixed and I can mount it like any other emitter without shorting it out? Osram CSLNM1.TG FLAT LED on 20mm Noctigon DTP MCPCB
I would like to run this with a very well regulated driver. Djozz’s graph says 4.5A-5.5A is the sweet spot. Anyone have a US retailer that supplies that? Or is Led4Power going to be my best place to get one?
I may try this out in my Jaxman Z1 (Cometa) which needs a 22mm driver. What have you guys been using in this case?
I tend to define efficient thrower LED as one that gets high intensity (cd/mm²) while retaining good efficiency (lm/W).
I asked myself a question: how does a collar affect efficiency?
Not efficiency in combination with a well matched aspheric; there the answer is easier. Efficiency of emitter-collar combo.
Collar reduces lm/W. It increases cd/mm².
Emitters tend to be very inefficient when driven to top currents. That’s especially true with Osram thrower LEDs - because they can be overdriven much harder than any other LED BLFers have tested.
If they are driven with lower current they are much more efficient.
The thought was: the top intensity that emitter achieves is a mild one for a collared one. Will the output loss caused by the collar offset by better efficincy of the LED itself?
Thanks to your data I was able to answer this question (note: I estimated lumen. My estimation ignores light that passes through collar and reflection off collar edge).
The answer is “probably no”, collared LED is not more efficient. At 0.96A your collared LED does about 56 lm/W and 227 cd/mm². Emitter alone can reach 247 cd/mm² with 87 lm/W.
At the peak emitter alone does 56 lm/W and 334 cd/mm² (awesome result! L4P measured 285 cd/mm² at 47 lm/W and djozz measured even less).
The closest point of collared LED is 45 lm/W and 387 cd/mm².
For the curious: at the peak a collared LED does 24 lm/W.
Small Xenon short-arc bulbs like the one in the Maxabeam (75W) have about the same efficiency, but they have an even higher luminance. Of course, they have many other disadvantages…
Collars can only be used with lenses.
The angle of light that will hit the lens will not change whether you use a collar or not.
So essentially the lumens that the LED puts out is irrelevant.
What matters is the lumens that actually hit the lens and come out of the flahslight.
Everything else is lost.
By doubling the intensity of the LED, a collar also doubles the flux output from the lens, doubling the effective lm/W.
If the LED is doing ~50lm/W at 5.5A only 25% of that will be captured by a lens that collects 30 degrees.
That is ~12.5lm/W.
The collar will double the intensity as well as the collected luminous flux, giving ~25lm/W.
Just thinking out aloud here… if you had a small enough collar with a large enough parabolic reflector in a recoil configuration where the focal length the parabolic reflector was long enough to use a collar, would there be a benefit?
This is over-simplified, doesn't it? Typical emitter datasheet spatial distribution graphs reveal the light intensity is higher at the center and decreases gradually with increasing angle offset. This means emitters deliver most of its light out the front. Topmost 60° out of an XP-G3 are above 90% relative intensity, whereas at 120° cone borders we're already below 55%.
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