TK's Emisar D4 review

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ToyKeeper
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Jtm94 wrote:
“So what do you have to do for it to play music to you?” Told them I hadn’t figured it out that far, but it might be possible.

They joke, but … it has been done:
https://en.wikipedia.org/wiki/Photoacoustic_effect

leestrong
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ToyKeeper wrote:
They joke, but … it has been done:
https://en.wikipedia.org/wiki/Photoacoustic_effect

I see that 5 clicks hasn’t been assigned to a mode yet, this should be it.
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glide 1 wrote:
jack-bkk wrote:
will this driver alone be available ??

I believe there is mention of this a few pages back, MTN will have them available?


No, MTN offers different (but similar) drivers with the same UI.

As to UI…People, I warn you, don’t buy D4.
It’s dangerous. Ever since I bought it, whenever I think “Wow, what a nice flashlight, maybe I should get one”, a thought follows: “UI will suck”.
Then I start wondering about getting one modded.
If it’s clicky, I recognise it’s a terminal disease. But then start thinking about crescendo…and since I don’t trust this works as well, I decide not to get the light.

djozz
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Agro wrote:
glide 1 wrote:
jack-bkk wrote:
will this driver alone be available ??

I believe there is mention of this a few pages back, MTN will have them available?


No, MTN offers different (but similar) drivers with the same UI.

As to UI…People, I warn you, don’t buy D4.
It’s dangerous. Ever since I bought it, whenever I think “Wow, what a nice flashlight, maybe I should get one”, a thought follows: “UI will suck”.
Then I start wondering about getting one modded.
If it’s clicky, I recognise it’s a terminal disease. But then start thinking about crescendo…and since I don’t trust this works as well, I decide not to get the light.

Big Smile I had to re-read your post to find out what you intended to say, LOL
Sledgestone
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djozz wrote:
Agro wrote:
glide 1 wrote:
jack-bkk wrote:
will this driver alone be available ??

I believe there is mention of this a few pages back, MTN will have them available?


No, MTN offers different (but similar) drivers with the same UI.

As to UI…People, I warn you, don’t buy D4.
It’s dangerous. Ever since I bought it, whenever I think “Wow, what a nice flashlight, maybe I should get one”, a thought follows: “UI will suck”.
Then I start wondering about getting one modded.
If it’s clicky, I recognise it’s a terminal disease. But then start thinking about crescendo…and since I don’t trust this works as well, I decide not to get the light.

Big Smile I had to re-read your post to find out what you intended to say, LOL

Haha, me too! Twice! Big Smile

TheBo
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I still don't get it... It sounds like a rant.... But..... 

Rufusbduck wrote:
Getting discouraged is normal but doesn't finish the job.
hIKARInoob
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It’s a money saver; the D4 kills our hobby of buying lights. It’s a reference light to which other EDC lights are compared to. Same with M43.

Sledgestone
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Yes, I believe what he’s trying to say is that the D4’s UI is so good that you’ll never need to buy another light.

hIKARInoob
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Sledgestone wrote:
Yes, I believe what he’s trying to say is that the D4’s UI is so good that you’ll never need to buy another light.

The entire light is excellent. Apart from UI, one of the things I enjoy every time is picking up the light and without looking at it finding the button via the raised section left and right of the button. Once the button is found quickly, pressing it gives such a nice tactile feel and feedback. So before you’re dealing with UI, the experience is already really nice.

Sledgestone
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I couldn’t agree more! The whole light oozes quality! It’s probably the best light to own, regardless of price. The only thing that I would change is the tint options, but that’s easy enough to do yourself.

Firelight2
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glide 1 wrote:
jack-bkk wrote:
will this driver alone be available ??

I believe there is mention of this a few pages back, MTN will have them available?

Mtn is not selling the bare driver. However, Mtn HAS added the D4 firmware as an option to their line of FET+1 drivers in various sizes. The drivers with the D4 firmware are available now.
zak.wilson
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The driver is substantially identical in design to the mtn-ddm series with an attiny85. The packaging is slightly different, but that shouldn’t matter in most cases.

Ceilingbounce – flashlight testing and runtime graphs for Android

battery
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djozz wrote:
I tried to EDC the D4 in my pocket (with keys) for a few days, and am afraid it is not going to stay there. Without lock-out it fires in the pocket about twice a day (some were to moon, some a lot higher), with lockout (manual or via UI) it takes fiddling before I can use it. I use my light multiple times a day so it is sort of important to me to switch it on in a second.

Exactly what a few people were saying a couple of dozen pages ago…

Agro
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I didn’t mean you’ll never need another light. Quite the opposite, different needs call for different lights. But having used this UI, I know I will not enjoy about any light available.
The bar has been raised. Other manufacturers need time to catch up. I surely hope they do it soon.

noboneshotdog
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Agro wrote:
I didn’t mean you’ll never need another light. Quite the opposite, different needs call for different lights. But having used this UI, I know I will not enjoy about any light available. The bar has been raised. Other manufacturers need time to catch up. I surely hope they do it soon.

Agreed. I am looking forward to upcoming Emisar offerings. With even more improvements to the UI. WOW! Great time to be a flashaholic.

Thier ain’t no bones in a hot dog. F. York

Geuzzz
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UserM4 wrote:
Until I can find a clip, I’m just using a zip tie and a wrist strap lol.

!{width:65%}http://i.imgur.com/Hy0TYWD.jpg!

Nice solution!

I just put a chris reeve style lanyard on my 18350 tube for some extra grip.

hIKARInoob
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How about two thick O-rings in the grooves; would that make sense?

Geuzzz
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hIKARInoob wrote:
How about two thick O-rings in the grooves; would that make sense?

Should work well also. For now I like the “pistol grip” with the lanyard.

hIKARInoob
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Geuzzz wrote:
hIKARInoob wrote:
How about two thick O-rings in the grooves; would that make sense?

Should work well also. For now I like the “pistol grip” with the lanyard.

Yeah I think it looks great, and I sure can imagine it works well too. Nice colour combination too. Thumbs Up

Agro
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ToyKeeper wrote:
Agro wrote:
Would knowing actual LED temperature help thermal management? I ask because I just learned that you can calculate it from Vf. It would require different firmwares for different lights though.

I don’t think calculating temperature from Vf would help. I’ll explain via analogy.

Let’s say I’m blind and I want to go outside, but my guide dog is very photosensitive so I need to select an appropriately-dark pair of doggie sunglasses first. I can’t measure the brightness outside directly, but I do at least have a lux meter and a window, so I check that to determine which glasses to use. This is sort of what the D4 does now.

However, I also have a GPS clock which tells me the time, date, and location. So maybe I could calculate the average brightness at this location based on the time and date plus a reference chart for average seasonal weather conditions. This is like calculating temperature based on emitter Vf.

It seems like it would be less effective.


The way I see it is not that you have a lux meter and a window and a doggie. The doggie is your cousin’s who lives 20 km away.
Anyway it may still be better than the average.
Though I mentioned it before, measuring directly would be another improvement.
However….I see in the simulator that you don’t model body temperature explicitly. I have not looked at D4 sources, so it may be different. Directly, this is the value that you measure during calibration. And this is the temperature that you’d like to limit; not LED temperature really. Is there some accuracy to be gained by adding another latency parameter?

I asked a while ago to clarify which XP-L HI bin did you use in the test. Could you clarify?

ToyKeeper
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I used whatever bin(s) Hank sent. It has a cool tint, so probably the 1A option. However, both XP-L HI and XP-G2 test units were thrown together from spare parts which seemed unfit for customer use, so it’s possible the bins may not match any of the ones he sells.

The simulator is nowhere near an accurate physical model; it’s a quick approximation. It sounds like some other recent projects (BLF GT, maybe FW3A) used some sort of fancy CAD simulator for thermal modeling, but I don’t have anything like that. My entire development and testing setup is pretty ghetto — a DMM, a power supply, an “integrating milk carton”, and a few decapitated lights with their brains hanging out.

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battery wrote:
djozz wrote:
I tried to EDC the D4 in my pocket (with keys) for a few days, and am afraid it is not going to stay there. Without lock-out it fires in the pocket about twice a day (some were to moon, some a lot higher), with lockout (manual or via UI) it takes fiddling before I can use it. I use my light multiple times a day so it is sort of important to me to switch it on in a second.
Exactly what a few people were saying a couple of dozen pages ago...
My pocket must be looser than yours.  Been pocket-EDCing a D4 for 3 weeks now without any lockout activated and I've had zero accidental activations.

That said, just in case, I do make sure never to put it in my pocket with turbo mode memorized.

hIKARInoob
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Firelight2 wrote:

That said, just in case, I do make sure never to put it in my pocket with turbo mode memorized.

That’s what I do when I put it in my coat pocket as well. However because of this, the D4 falls in a specific category of EDC lights; one that does require attention.

patmurris
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ToyKeeper wrote:
Jtm94 wrote:
“So what do you have to do for it to play music to you?” Told them I hadn’t figured it out that far, but it might be possible.

They joke, but … it has been done:
https://en.wikipedia.org/wiki/Photoacoustic_effect


Pretty cool indeed. Reminds me of Apple II playing some mono tonal Bach back then …through a one bit DAC – the speaker plugged right into the digital out i’m guessing. I had a bit of fun with machine code experimenting with polyphony on that crude audio interface. There is a whole culture of one bit sound audio in fact. You can even produce speech phonemes and synthetic voices.

That would make quite a fun Easter egg on a flashlight. Especially if you can upload or record different audio bits. Party

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Every light that utilizes a Li-ion cell requires attention. Period.

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I skimmed, but I admit I didn’t in detail read all 47 pages of this thread to find the answer to my question, so if it has been asked and answered already, I apologize. I’m wondering what is the practical purpose for having the UI set so the light “blink when passing the 100% 7135 level, for reference”. I can understand the blink at the lowest level of ramping, and blink at highest level, but I can’t see a reason why I would need to know when the ramping is passing the highest fully regulated level (FET turns on here) and blinks while it is passing through. While not a big deal, the lowest level blink and the highest level blinks seem helpful and important, the 100% 7135 level blink just seems annoying to me, and I can’t figure out a reason I need to know when the light is passing through that point.

This is not meant to be critical, I bet there is a reason the extra work was put into creating this reference point blink. Can anyone explain to me how it is useful to know this point in the ramping?

Other than that annoying (to me) lower level blink in the otherwise silky smooth ramping, this UI is one of my favorites of the over 300 lights that I own.

Thanks in advance for your help.

hIKARInoob
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^^^ From what I remember it has to do with the fact that with ramping it’s difficult to know how many lumens you’re getting, unlike with fixed setting, for example 10 or 100 lumens. The double blink lets you know that you’re at around 140 lumens depending on which led you have. The practical reason for this output is that it is a nice usable output, and the technical “geeky” reason is that you have 100% 7135. So it’s an orientation.

Joey Adams
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It is simply to let you know when you are leaving the far more efficient 7135 powered portion and entering the inefficient fet levels. If you edc and need to use it a lot it is a excellent way to be sure to conserve your battery. At least that’s why I like it.

Flash-O-Maniac
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Thanks for your responses. Now I get it. I think ToyKeeper is absolutely brilliant and I felt she wouldn’t include this feature unless there was some practical purpose that I didn’t understand. Now I understand. Thanks again….

UserM4
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Does anyone know if there’s plans to make a similar light in a larger body with bigger reflector? Hopefully with added heat sinking people with delicate baby soft hands like me can use it without welding gloves on.

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