Thats a good one but also a hard one to call, im pretty set on using SBs numbers over some manufacturer claim but he does go on to say it beats most stuff until the TN31! Maybe wait for his next test or someone elses results? Or shall i knock the Olight M3X out as thats its bracket i believe?
Edit: getting muddled up, hopefully thats looks about right now?
Since we have some serious throwers here can I ask a favor ? My question is if a Thrunite TN31 with 1,147 lumens is modded to throw a beam of 240Kcd wouldn’t the lumen output also increase ?
My confusion is the difference in how to compare lumens,Lux, and Kcd figures !
Thanks for a reply I’m looking into a Onestopthrowshop torch…….
Its max capability may very well be 1147 lumens but it all depends on the diameter of the reflector, design and how hard the led is driven. In this case, results will vary.
It is modded by dedoming the LED. What dedoming does is it takes off the dome which disperses the light. This means that instead of shooting the light everywhere, it shoots most of the light forward. Here I drew a picture in paint for you.
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I hope this clears things up.
EDIT: This diagram is wrong, please refer to comment 73 for the correct diagram
Cree LEDs are not made to be dedomed like Luminous LEDs are. So you can try, and you will have a really hard time but if you don’t have experience with dedoming XMLs then give yourself a 10% chance or lower of succeeding.
It’s better to practice on something else… so perhaps buy a couple of XMLs and try to dedome them first.
This diagram is wrong. The lens in front of the semiconductor element focuses the light to go more forward, not to disperse. Otherwise the light would follow the standard COS curve. The light that goes “forward” is what forms the spill, and what goes to the side (off reflector) is the spot. Dedoming puts more light into the spot (but not necessarily a brighter spot, perhaps just larger one), and cuts losses through one extra optical element.
I understood that taking the dome off changes the light path…. What I can’t comprehend is that the light thrown goes from 130,000 Kcd to 240Kcd by only removing the dome ? No wiring No increase on amperage and no changing wires or drivers… Then these guys charge $70.00 extra on a TN31 and charge $285.00 just for dedoming…. Wow
So what you’re saying is that instead of emitting light from the top of the LED, most of it goes towards the side? That makes more sense actually… I’ll change my diagram
More of it goes towards the sides. Look at the diagram of “typical spacial distribution” in Cree lit, then compare to a Cos graph. It’s not OMGXBOXHUEG difference. In cree emitters, the phosphor “gel” layer is in between the dome and emitter (the stuff that turns blue led into “white” led), so dedoming without disturbing this is YMMV.
Reflector
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Dome LED focus the light forward and narrow the angle of emmition, Projecting more light forward.
So less throw but more spill and more OTF.
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De-domed LED = The larger angle from de-doming increases the amount of light hitting the reflector
So… increasing throw but less spill and less OTF.
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Blue = become spot
Red = become spill
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To expand on this, most big reflector “throwers” I find don’t have optimal throw. IOW, you can get a brighter (and smaller) center spot by moving the led relative to the reflector. That’s probably done on purpose because a decent sized spot is more useful than a tiny one (and not because the manufacturers are idiots), though I would question the logic of a bigger reflector if they’re not going to take full advantage of it.
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