That's a neat way of doing beam shots, but can you slow down the frame rate a bit? I don't have quite enough time to look at the picture *and* read the caption. Maybe 2 seconds per frame?
Nice GIF, I'm glad I got the larger reflector of the C8, even though several of those XM-L lights have literally the exact same beam shot images on KD. :/ The A20 is not quite big enough even for a flooder, but DANG can it flood. :D Awesome.
I have a A20B on the mail. I were planning to use it as is but I can transplant its R2 to a thrower and an XM-L or XR-G into A20B. How does it mod? It requires 14mm emitters at most I belive, am I right?
I don't have a 14mm XM-L right now but a 12.8mm R5 is also on the mail. I wonder which one would be most efficient at something like 1.2A current to LED.
I'll better reserve XP-G leds to 2xAA lights as boost should work better with a lower Vf. I guess any 18650 light can unleash the potential of an XM-L. I plan to start with something with more space, like an UltraFire C8 or a bigger TR-1200 body. Ordered my insulators, thermal epoxy, 2.8 linear and 3A buck drivers, empty P60 drop-ins, Dremel tools and so on... :)
I did see somewhere on CPF that an XP-G R5 was brighter than an (unstated bin, probably T5) XM-L until you went past 1500mA. But my memory may be at fault. The XM-L is more efficient at any given current, but not necessarily brighter. It is when the XM-L becomes much less efficient that it gets really bright. The same is true for most LEDs
I don't think that's true about the output. Cree determines the bins at 350mA. So a higher bin will always be more efficient and put out more total lumens at pretty much any current than a lower bin. Now the brightness of the LED die itself (and therefore the throw) may not increase for the XM-L until you get past what the XP-G is rated for which is 1500mA. That's more of a lumens/mm2 thing though.
I went looking for the post at the Other Place and gave up as they've rearranged it in a way I do not find useful. I gave up on searching as a bunch of patients needed seeing. Wonder how many threads "got lost" this time?
I've no idea why but a lot of websites I look at daily have been redesigned in the last few weeks.
Nearly all of them are now worse - except here. Personally I'd prefer slightly smaller text but given that a pinching gesture on the mouse will fix this, it really isn't a problem
Yeah, you're right. That seems inconsistent on Cree's part. So really the XM-L T6 has about the same output at 1500mA as an XP-G S4 would. And the XM-L T5 is about equal to an XP-G S3.
Where do the XP-G S3/S4 start to lose efficiency though? The XP-G R5 levels out really fast around 1 amp in the tests I've seen. Nowhere near linear between 1 and 1.5 amps. Did you make that consideration part of your calculation? And where are those test numbers for the S3/S4?
From KD's XM-L T6 drop in, Don was getting:
436 Lumens @ 3.736V battery / 1523mA tail