Compare them to other flashlights using the Flashlight Comparator.
I’m currently working on adding an interactive runtime graph to the comparator. Should be able to publish that next week (currently running more runtimes measurements).
11 Thanks
Thanks so much for the detailed comparison and beamshots at different distances. Using the same host is perfect for showing the differences in the leds!
2 Thanks
What he said, great comparison shots. I really like that LHP73B beam pattern.
1 Thank
Thanks for beamshots and runtime graphs 
The M21B is still my most used light. To many flavors now to keep up though.
3 Thanks
M21B with an LHP73B is a great setup.
I have one that pulls close to 40 amps.
It gets hot fast, but seems to handle it fine in shorter bursts.
1 Thank
Don’t you mean 20A? I don’t think LHP73B can survive 40A…
What is the element that the copper radiator? sits on top of and does it touch the case somehow?
1 Thank
It is a heat sink I was messing around with for the mosfet. I was hoping it would make contact with the host, but it didn’t.
I was thinking of thermal gluing it, but ended up just removing it.
2 Thanks
I wonder which direction would the heat flow if it did?
1 Thank
I was hoping it would dissipate heat from the mosfet while running at less efficient levels, and use the host to sink the heat away. In reality, I’m not sure it makes much difference.
1 Thank
Where can I get one of these quick? I like the 42r version
I bet it definitely makes a difference. The Sofirn Q8+'s MOSFETs are infamously known to burn up when paired with high-drain cells–given how little thermal mass these components have, and how high the temperatures get (hundreds of degrees C, way beyond the rest of the light), any additional heatsinking helps. The little copper device, even if disconnected from the light’s body, should still increase radiative cooling several-fold.
1 Thank
2 Thanks