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Please help - completely off topic and I apologize but can anyone help me with what optic the KR4 comes with stock? 10621 / –22 / –23? I am pretty sure I know its not the –23. i ordered a –21 from Mtn electronics because i thought the KR4 came with a –22, but the –21 kind of looks like whats in my light now? I don’t want to bother Hank with these basic questions… again…

I believe the normal KR4 comes with the 10622, and the E21A variants come with 10623. I much prefer the 10621 in my SST-20 D4’s and KR4’s.

Thank you for the info! I will have to put in the 10621 I got from Mtn and see if there is a difference from what is stock in my KR4. They visually look very similar. Hopefully I didn’t get a 10622 sent to me… I wish there was some marking on the optic to distinguish them. I’m new to this, there probably is some way to tell the difference

You could make a 22 optic into a 23 by sanding with 800 or 1000 grit sandpaper to make it frosted.

You’re welcome! The 10621 and 10622 are similar looking. However, the 10621 has slightly recessed circles (lenses?) directly over the emitters, whereas the 10622 is smooth across the top. See here (not my photo): 10621. I hope that helps.

Dude, that is awesome and very helpful! I was just able to confirm I did get the 10621 thanks to that picture. Thank you!

Thank you scalpel_ninja also for the tip on sanding the 22 to a 23!

Any time! Let us know how you like the 21.

I just popped it in the KR4 (sst-20 5000k) and… Wow, its awesome! I recently bought that 10621 along with the 10623, 10507 and 10509 to switch my optics up. I was saving the 10621 for my “custom” (from Hank) d4v2 brass with W2’s (my first d4v2 :D) that is in route to me now, due this week, thinking I would put the 10623 in my KR4 and have a “thrower” and a “flood” edc, respectively. But now I’m scratching that and putting together a Mtn electronics order to get another 10621 for the KR4. It almost looks like it gave me 50% more throw. I know its not that much, but it is definitely noticeable over the 10622, much more then I expected! Almost looks like it throws as far as my EC03 (I just got that one in this week too, another great little torch!). No wonder why this hobby is so damn addictive… :innocent: Thanks for the help again.

You’re welcome! I’m glad you like the results. I have 10621’s and 10507’s in most of my quads and triples. It’s made a huge difference in enjoyment of use for me.

Received the soft blue camo today with Fedex but without having asked it ; took 3 days . I have a better feeling with this switch than from my other ti . So now i have e21a’s in 5000,4500 and 5000/3500 .

Pics or it didn’t happen? :stuck_out_tongue:

Funny . I didn’t beleive it too when fedex rang my door ; i had received hank shipping email today, but didn’t bother to check . Can’t satisfy you today : no phone and my camera is in one of my boxes from my moving .

New stuff in . E21A in 2000 and 2700k .

Damn… I may have to get a 2000K mule…………… :weary:

I want to almost completely because i am so curious after reading everything n here from people that know so much about color “temperature” (I don’t know if thats even the right term). but yea, a 2000k mule sounds awesome.

Thank you Hank for getting the E21A 2000K and 2700K that we asked for. Time to buy more D4V2s.

E21a’s makes a lot of heat, more than xpl-hi ( not true, see further ) . My d4v2 with E21a is heating faster than my Kr4’s with E21a .

That doesn’t sound right. E21A (except possibly mules) should be limited to 5A current, XP-L HI should consume more than 10A with a decent battery.

Is either one of your E21A flashlights a mule?
Did you calibrate the temperature sensor on all flashlights?
Is the temperature limit set to the same value on all flashlights?

On the max CC setting it would get hotter due to lower vF, AL pcb, no thermal pad wouldn’t it?

Yes, the D4v2 has less thermal mass than the KR4, so it heats faster.

Edit: at the same power levels

If one light is running at a higher power level than the other, like a direct-drive XP-L HI vs a regulated E21A, the higher-power one should heat faster. Because 20A of power vs 5A is a much bigger difference than anything caused by the LEDs or the small difference in host size.