Probably heating either to fast or too slowly, or not the correct amount of paste. These pads center way better than the TPAD quad due to the overflows on the side pads and rounded overflow on the center pads. I always fought the TPAD quads, but these center up nicely.
I do not have to touch the LEDs at all on these (with good pads and correct amount of paste and correct reflow profile you shouldn't have to ever touch the LEDs during reflow).
Good evening Richard, I am about to place an order for several XPL Hi Leds and a VT6 battery, Do you have XHP70.2 LED on order? if so What tint and bin? Looking for a 1A tint in the highest bin available…
Alex, that’s exactly why I don’t buy emitters from digikey or Mouser, they sell a group bin and you can’t ever rely on what you’re going to end up with.
I get mine from digikey, I just order the easywhite bins, they are all within a macadams ellipse, so you at least know a range it will fall in. All the different color bins are too much for me to worry about, so far I haven’t gotten anything I didn’t like.
I buy emitters from Richard, or Cutter, or LEDDNA and occasionally from Intl Outdoors. Probably won’t be buying from Cutter though, everything just got out of hand on that end.
No, they do not sell group bins.
The part number describes exactly what bin it is.
XHP70B-00-0000-0D0BP250E-ND
for example, this is LED is chromacity group 50E, min flux group P2, CRI group B (70 cri), etc etc etc
All you have do to is read the data sheet and scroll down to page 22.
Or you can literally just sort by lumen output or CRI or whatever spec you want directly on the digikey/mouser website by clicking the top of a column.
What’s the narrowest/thinnest 26650 cell available?
I got a couple of cheap flashlights in “blunderbuss” style (7-emitters, 3-cells) that are bored out just too narrow to accept my EVVA cells (the shrinkwrap would peel off if I forced the cells into the tube).
They bundled 18650 cells in those plastic sleeve carrier things, which fit the tube loosely. But I’d rather use the larger diameter cells if I can find some that fit.