TK's Emisar D4 review

ven · 2018-04-18T16:49:54.000Z

I find the D4 moon(or what ever you want to call it)mode pretty decent. But then i just dont care for sub lumen levels at all, inc ZL’s 0.000000001lm type outputs(ok a little exaggeration).

Generally i like to see well, even in the middle of the night(limited uses here though), sub lumen i just cant see well enough. I prefer a few lumens for example to light a few steps up. If i want some ambient light/mood type thing, the HDS candle mode(9 clicks from off) is pretty awesome. If i tend to tail stand a light, i always use a few lumes, D4 case i ramp it up a little to light up the corner .

I think i am 1 in a 1,000,000

ToyKeeper · 2018-04-18T23:16:31.000Z

Interesting, I hadn’t heard about a HDS candle mode before. I think that’s now four different implementations I’ve seen, all of which seem completely different from each other. The HDS one looks particularly spastic, like it’s always wobbling and never settles.

Anyway, super-low modes are nice, but they generally require extra hardware to make them feasible. The D4 doesn’t have any extra hardware for that, so its lowest modes are pushing more general-purpose hardware to the edge of what it can do. All I did with Anduril was find a way to make that edge a bit lower, more efficient, and more stable.

hIKARInoob · 2018-04-18T23:21:58.000Z

Is it possible to use high frequency PWM specifically on that single 7135 chip, let’s say on a ~1 lumen output to generate a stable sub lumen output of say ~0.01 lumen?

ToyKeeper · 2018-04-18T23:36:53.000Z

hIKARInoob:

Is it possible to use high frequency PWM specifically on that single 7135 chip, let’s say on a ~1 lumen output to generate a stable sub lumen output of say ~0.01 lumen?

Yes and no. The faster it goes, the most voltage-sensitive it is.

0.01 lm, yes.

Stable, no.

I used a combination of PWM and PFM to make a self-adjusting moon mode on my original Cypreus light, when it was a FET-only design. It adjusted itself from 8,000 to 2,000,000 pulses per second. But it still was too bright on a full battery, and too dim on a low battery. Kinda neat watching it regulate itself though, since it made an incredibly smooth sub-lumen ramp.

What I’ve found works better is slowing down PWM as much as possible on moon mode… not enough to look like a strobe, but enough to make the output more stable. If I recall correctly, Anduril adjusts its PWM speed from 4,000 to 16,000 pulses per second depending on the overall brightness level, to increase stability and efficiency at the low end. This also makes it much more consistent from one light to the next.

hIKARInoob · 2018-04-18T23:40:51.000Z

Cool, thanks! :+1:

moderator007 · 2018-04-19T00:19:17.000Z

Does anyone know which type 7135 that is used on the D4 board. The 7135 on the BLF A6 FET + 1-7135 board can be run so low that it just barely glows in moonlight setting 1 of NarsilM. The reason I ask is because I just modded Astrolux E01 with a 22m FET + 1-7135 Mtn driver. I reflashed the attiny85 with NarsilMQ8. The led would not even come on in moonlight until I reached level 4. In ramping the floor level was not lighting up the led. The light was still on but there was no light. I could hold the button and ramp up a couple of levels then the led would light up and continue increasing until the ceiling. Going back down near the bottom of the floor the light would go out. I couldn’t live with this light being on at the floor level but no light coming out. I wouldn’t know if the light was on or off. I figured the difference had to be the 7135 since NarsilM always worked fine with the BLF A6 driver. I asked Richard and he agreeds it’s probably the 7135. So I hot aired the 7135 off the Mtn driver and Stripped a 7135 of a junked BLF A6 driver (mod gone bad) I had laying around. Reflowed the 7135 from the BLF A6 board to the Mtn board and everything works like it should now. Moonlight setting 1 is a faint glow. Ramps up and down just fine now, so that’s fixed.
.
So how low of a mode that can be accomplished with light, will depend on which 7135 that is used. Richard uses a 380 ma 7135. The BLF A6 board uses a 350 ma 7135 as far as I know. The A6 is on the left and the X6 is on the right both have a very low moonlight with NarsilM. You can see that little symbol (looks like a rainbow) to the left of the L7135. I don’t know who makes them but they work good for sub lumen modes.
.

ToyKeeper · 2018-04-19T01:31:07.000Z

The D4 uses the same “raptor claw” brand chip. So does the BLF Q8, IIRC. And that’s what we spec’d as a requirement for the FW3A.

The 380mA chips pretty much all have poor performance at the bottom end… but so do some of the 350mA chips. There are only two specific flavors I’m aware of which work well at the lowest levels, and both are 350mA varieties.

That’s not all there is to it though. Other factors matter too, particularly the type of LED. Like, XM-L2 will generally light up at levels which the older XM-L won’t. All this moon stuff is highly hardware-specific and tends to be inconsistent even from one identical item to the next.

Phlogiston · 2018-04-19T01:43:33.000Z

The 7135 version with that “rainbow” logo is probably the best available 7135 design. You’ll normally see it referred to here on BLF as a “raptor claw” 7135, and they’re irritatingly hard to find a reliable supplier for.

It seems to be made by a company called “Nanjing Micro One Electronics Inc.” Their website isn’t up to much, but I did locate their 7135 datasheet - their part number is MEL7135 - on a different website that seems to be a Chinese component supplier. Be warned, the datasheet is decidedly flaky

While we’re on the subject of 7135 logos, I hear that the “sailboat” 7135 made by ADDtek is one to avoid, and the generic 7135s with no logo are essentially a lottery.

Edit: I see ToyKeeper got in before me:

ToyKeeper:

There are only two specific flavors I’m aware of which work well at the lowest levels, and both are 350mA varieties.

That’s interesting to know! What’s the other good version?

ToyKeeper · 2018-04-19T01:49:23.000Z

Phlogiston:

That’s interesting to know! What’s the other good version?

One of the unbranded ones that Convoy tends to use seems to work well. All it says is “7135” on one line, then “35B” or some other letter on the next line. I think I’ve seen A through F.

Phlogiston · 2018-04-19T02:17:32.000Z

Thank you

I might have some of those lying about, chucked in a parts box thinking they weren’t as good as the “raptor claw” ones. That would be a nice surprise!

moderator007 · 2018-04-19T04:03:27.000Z

That’s a lot of good info. Thanks Toykeeper and Phlogiston.
The D4 uses the same (rainbow) raptor claw type 7135, good to know. :+1:
Is there any variation in the raptor claw brand that doesn’t give a good low or are they all the same besides the manufacture slight variances.
Mine has numbers at the bottom, right below the L7135. Is there any particular number code?
I got one more driver to give a 7135 super low transplant. I have a bunch of 7135’s, needing to find the better one to use.

AnhTran · 2018-04-19T07:22:50.000Z

i42dk:

Just wanted to chime in with a little observation.

I like to give my flashlights a “weathered look”. So they look like they have been used for years.
None of my flashlights are pretty shelf queens

This involves some semi-fine grit sandpaper, sometimes a dremel.

imgur album

So cool, which light has the most durable anodization in from your experiences?

CrashOne · 2018-04-19T08:06:03.000Z

Probably black and green or blue the weakest.

ChrisGarrett · 2018-04-19T14:04:43.000Z

I was recently working at a SEARS being liquidated and had my cyan D4 all over the place, most recently lighting up a darkened 40’ trailer while I loaded rugs on pallets, along with rolled up ones. I used it as a candle, so I could read the labels and stack them like a wood pile.

It got knocked over a couple/few times and during the two months, I was on my stomach strapping pallets and lugging rugs around wearing denim blue jeans. Except for some oils from my hands, dirtying up things, the cyan finish has been fine.

I even mis-reinstalled my pocket clip and it didn’t mar the finish.

Now, if you’re out on the front lawn eating paint chips and scraping it on the driveway, all bets are off.

Chris

allcool · 2018-04-19T15:41:15.000Z

Is the green D4 discontinued,?
MTN no longer lists it.

Hanks site, International Outdoor only lists the grey and black D4 now.

OneBadWolf · 2018-04-23T02:34:12.000Z

Niko:

Yes i agree.
my opinion d4 need to be slighty bigger, like d1 and with internal coppper heatshink. This will help for sure.

What we need is the same level of development in Peltier effect semiconductors as we’ve seen in LED emitters. A hybrid Peltier effect/LED would be really cool! (small pun there)

I used to use them to cool CPUs. They worked ok, but they are no more efficient today, than 10 years ago. I would not begrudge adding more power for benefit of the light maintaining a comfy temp on turbo. Sort of like field weakening in a DC motor. Uses more power, but provides higher RPM.

I just love my D4. Never before have so many owed so much buespottedness to so few. Everybody seems compelled to to point the cute tiny little thing at their face and push the on button. lol It never gets old.

ToyKeeper · 2018-04-23T02:48:21.000Z

OneBadWolf:

Never before have so many owed so much buespottedness to so few. Everybody seems compelled to to point the cute tiny little thing at their face and push the on button. lol It never gets old.

Ever handed a BLF-A6 to a muggle, with no explanations or warnings?

OneBadWolf · 2018-04-23T02:59:38.000Z

ToyKeeper:

OneBadWolf:

Never before have so many owed so much buespottedness to so few. Everybody seems compelled to to point the cute tiny little thing at their face and push the on button. lol It never gets old.

Ever handed a BLF-A6 to a muggle, with no explanations or warnings?

lol

I love the A6 so much, I bought a bunch for friends. I don’t know if they ever learned how to fully operate them, or whether my threats of reclaiming them, and providing them a bic lighter in exchange dissuaded them from asking me to “stop by and fix the flashlight so its like it was before”. Now, if there are any more flashlight visit, it usually is a cracked lens, and I don’t mind replacing those.

A couple of my friends stopped using the A6, which made me feel like the flashlight Nazi I am, so I provided them SII’s and all are happy. Muggle mode might work for some, but I’m afraid that my friends will find a way to escape muggle mode almost intuitively, but never get it back to what they want.

ToyKeeper · 2018-04-23T03:05:00.000Z

Usually what happens with the A6:

Click.
“Why isn’t it doing anything?”
Click.
point at face
Click.
scream

OneBadWolf · 2018-04-23T03:21:03.000Z

Bwahahaha Exactly. Thankfully, most of my friends don’t own firearms. Oh well. at the end of the day, they are my friends though. I made them myself.

I’m much calmer these days, not like when I would carry spare optical mice, to replace the lumpy, grotty ball mice that they expected me to use to make their computer work again, and which I would unplug, put into a plastic bag and stomp.

I’ve mellowed I guess.