TK's Emisar D4 review

Yup, you guys are definitely a bad influence.

Nah, I bet you are truly grateful. :smiley:

the green look nice, i hope i dont regret buying the green one.

My green D4 with N219C’s came today. :smiley:

Even with a Panasonic NCR18650B cell it still get’s hot on Turbo and starts stepping down fairly quickly. Seems to me the tube is robust enough to bore it for a 20700…. will see about that. If I kill the long tube it’s not a big deal as I like the short configuration anyway.

Has anyone installed a TA Driver in one of these? I was thinking about it to significantly improve the efficiency of the medium modes considering how high Turbo is…

You are my bad influence. Haha. Ordered one green piece after seeing your pic.

Swapped out the 5A2 XPL HI I had in one of my D4s for 3A XPL HI last night. Tint looks a very pure white, much cooler than before. Cooler even than 3D.

Might be a bit too cool for me. Next thing to try is a mix and match. Perhaps two 3A + two 5A2 or maybe three 3A + one 5A2

The green color made me buy it. A birthday present to myself. My birthday was Aug 9, so my birth stone is Peridot, which is lighter in color yes but close enough. :smiley: So if I can get it outputting green light as well, the inner Green Lantern will be happy. ROFLMAO

Hello

Which holster do you recommend for this FL?

Thank you

I like the Astrolux holsters - especially for the price the quality is nice.

Ordered my second D4 with XP-G2.

219c with 20700? Sounds hot.

219c with 20700 sure sounds cool, i dont know how you guys get on with 18350 or 18500’s………….I can run an 18650 down in minutes, few lasts/step downs and the cell V is 3.6v. In fact, i tested a vtc5 2600mah cell, from cold 100% stepping down/ramping till it settled . Left it for a few mins and checked the V at 3.98v. So roughly a normal use from max output.

I have 2 spare 18650’s with me now lol

Well, the Sanyo “B” cell has some 4200mAh and does around 10A, the “A” cell is around 3000mAh and does much more current. So I was thinking the high capacity B cell might be appropro

Dale I had zero doubts that this light would finally suck you right in. It’s hard to resist an awesome light, sold by Richard, tinkered on by TK, and created by Hank and Tom. That mix of ingredients leads to an awesome light any day of the year. It doesn’t matter how many of these hot rods you have cranked out over the last several years, just hard to resist when a new one with high quality and minimal price like the D4 comes within arms reach. It’s instinct really, we can’t be blamed for what nature makes us do.

10a would help control the crazy heat a little(may get another 5 seconds!) but seriously 4200mah in the tank is super useful……………i like the idea!

Now we just need to convince International Outdoors to sell us some 20700 tubes. With knurling. :stuck_out_tongue:

Happy belated DB

Uh, well…. I got the D4 bored for the 20700. (first time to work on the lathe after surgery, it’s 104º in the shade, no air movement at the lathe at all)

Even using the Sanyo “B” cell it’s drawing 19.54A at the tail! :open_mouth:

In case anyone’s interested in more theory here, here’s a rough comparison of FET + 1 vs a FET + 8 + 1 driver (numbers from a quad 219C D240):

At 1000 lm:
1000lm / (300 lm / W) = 3.3W

FET + 1: Efficiency of 64 lm / W > 1000 lm / (64 lm / W) = 15.6W - 3.3W = 12.3W of waste heat
FET + 8 + 1: Efficiency of 113 lm / W > 1000 lm / (130 lm / W) = 8.8W - 3.3W = 5.5W of waste heat

That’s LESS THAN HALF as much heat using a FET + 8 + 1 driver.

At 1400 lm:
1400 lm / (300 lm / W) = 4.7W

FET + 8 + 1: Efficiency of 82 lm / W ==> 1400 lm / (82 lm / W) = 17.1W - 4.7W = 12.4W of waste heat

If a FET + 1 driver was thermodynamically was stable at 1000 lm, then a FET + 8 + 1 driver should be stable at 1400 lm.