Emisar D4S review

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ToyKeeper
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ssschen wrote:
Thanks for sharing these figures. I am probably going to draw fire from saying this. TBH, I am a bit underwhelmed and disappointed that the lumen outputs will drop below 1000 lumens in less than 2 minute? Is this behavior due to timed stepdown? Since this flashlight has more mass compared to the D4, which should help it to dissipate heat better, I was hoping it should be able to output half the max lumens for sustained period.

Are the figures similar for the other LEDs: XP-G2 S4 and XP-L HI ?

There is no timed step-down; it regulates entirely based on temperature.

Nichia 219c generates more heat than the other emitter types, and has the lowest sustainable output. Also, I don’t know maukka’s test parameters, like if it involved any cooling to simulate the effect of holding the light in one’s hand, or how its thermal settings were configured. However, maukka has probably the most accurate lumen measurements on BLF, so you can count on the numbers being good.

Here’s what I got with XP-L HI, with the thermal ceiling set to a comfortable and calibrated 45 C, with light air cooling from a fan:

If you want it to stay brighter, you can raise the temperature limit or add external cooling. Like, put it in cold water or hold ice against the heat fins, and it’ll stay at the highest brightness the battery can manage.

maukka
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My test was done with default settings. Temp sensor seems to be correct within 2°C. No active cooling nor heatsinking of any kind.

ssschen
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ToyKeeper wrote:

There is no timed step-down; it regulates entirely based on temperature.

Nichia 219c generates more heat than the other emitter types, and has the lowest sustainable output. Also, I don’t know maukka’s test parameters, like if it involved any cooling to simulate the effect of holding the light in one’s hand, or how its thermal settings were configured. However, maukka has probably the most accurate lumen measurements on BLF, so you can count on the numbers being good.

Here’s what I got with XP-L HI, with the thermal ceiling set to a comfortable and calibrated 45 C, with light air cooling from a fan:

If you want it to stay brighter, you can raise the temperature limit or add external cooling. Like, put it in cold water or hold ice against the heat fins, and it’ll stay at the highest brightness the battery can manage.

TK, thanks for this. I had wrongly assumed Nichia 219c would generate the least heat based on its lowest lumens output. Ideally I like the sustained output as I normally go out at night for 30 minutes walk, and it will be nice to have the light at the same level of output the whole duration of the walk.

What is people’s opinion on what temperature is still considered comfortable enough to hold the flashlight? 50, 55?

DB Custom
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ssschen, that’s going to be a subjective thing… you’re going to have to set it at what YOU are comfortable holding. I mod lights virtually daily, machine aluminum and copper on the lathe… my hands are so used to extreme heat that my idea of comfortable to hold is going to be much different than a lot of peoples. Almost like asking what pepper is too hot to eat, depends doesn’t it? Wink

ssschen
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DB Custom wrote:
ssschen, that’s going to be a subjective thing… you’re going to have to set it at what YOU are comfortable holding. I mod lights virtually daily, machine aluminum and copper on the lathe… my hands are so used to extreme heat that my idea of comfortable to hold is going to be much different than a lot of peoples. Almost like asking what pepper is too hot to eat, depends doesn’t it? Wink

I understand entirely. But please do humor me / us, at what temperature do you start to consider a flashlight too un-comfortable to hold? Big Smile

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Around 155ºF. Pretty much have to turn it off and put it on a heat sink at that point. (~68 – 70 C)

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50c/55c (120F-130F) is a good temp for me.

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aginthelaw wrote:
Newlumen wrote:
Same color as d4.

86_CFA40_F-3_D32-4_EA7-98_B6-_A79535_CD1_ECC

I meant in post 493, the middle light. In reference to the basen, someone gave it to me but the ones I’ve been seeing don’t seem legit. Liion wholesalers has the 4500mah basen in stock

I bought more shockli 26650 from rmm last night. Thanks.

DB Custom
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My two “early edition” D4S’s. Wink

Making 5685 lumens and 5171 lumens, respectively. Both from Sony VTC5A cells.


For clarification, both of these are made with the MCPCB and Optic that Hank designed/chose for use with the Emisar D4S. Both of these are running Bistro from an FET+1 driver.

scintillator
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Thought I would drop in and share this holster solution for the D4s.

I had an old Olight M21 Warrior holster and it ain`t too bad re-purposed for the D4s.

https://imgur.com/JnD0t4o
https://imgur.com/BVqUQ2N

fixed it
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ssschen wrote:
What is people’s opinion on what temperature is still considered comfortable enough to hold the flashlight? 50, 55?
Depends how long you hold it. Slow burn is a thing. And it’s insidious as you don’t feel it until long after it’s done. There are people who got burns to their legs from using car seat heaters in warm weather. I once burned myself lightly (no damage but skin was sensitive) by holding a warm soup bowl that never actually felt painfully hot. I just held it for a fairly long time.
ToyKeeper
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maukka wrote:
My test was done with default settings. Temp sensor seems to be correct within 2°C. No active cooling nor heatsinking of any kind.

Okay, in that case it stabilized at a higher output than I would expect. With no cooling or heat sinking, I figured it would settle lower.

During tests I generally have a fan blowing at the light, from 1m away, at the fan’s lowest speed. I’m not sure if this is a good way to simulate the heat-sinking of a hand, but it does at least make a pretty measurable difference compared to stale air. My thermal testing is pretty imprecise though.

strayz
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DB Custom wrote:
So it’s official, I ordered a green D4S earlier today from Richard. Big Smile

Wait, what? What are you saying strayz? You mean, lights are supposed to actually run longer than 10 seconds at a time? Shocked

It is kinda useful when they do. Otherwise I think they are called flash cubes. (If you know what they are you are really old…)

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strayz wrote:

It is kinda useful when they do. Otherwise I think they are called flash cubes. (If you know what they are you are really old…)

Know what they are? I probably have some in a desk drawer somewhere. Blushing

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Farmer Harv wrote:
strayz wrote:

It is kinda useful when they do. Otherwise I think they are called flash cubes. (If you know what they are you are really old…)

Know what they are? I probably have some in a desk drawer somewhere. Blushing

I just moved for the second time in 7 years, so I am sure there are none in the box of photography stuff I have hidden in the garage. LOL

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This may have already been discussed earlier. But is it possible to mod the light to a different aux led? I don’t love the blue. Would much rather green or even red. Is this doable?

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Here’s what the AUX LEDs look like on the meter. This is with the optics and a slight Zircon minus green on top so on the CIE graph the LEDs would actually sit just a bit higher.

eas
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Regarding the step-down rate. Keep in mind that if you don’t start on turbo, you should have longer before the light steps down from your initial output levels.

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Pugalo wrote:
Why 26 clicks for ceiling? Must be 25 (for ceiling 125) or I’m wrong?

The floor is N clicks, to set it to level N, or 0 clicks to leave the current value unchanged.

The ceiling is 151 – N clicks, so 1 click for 150, 11 clicks for 140, 21 clicks for 130, etc… or 0 to leave the current value unchanged.

The ceiling is basically off by one to make it possible to set the ceiling to turbo.

FindThisHumerus
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Are there any good beamshot pictures for this yet?

Bored anesthesia resident

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maukka wrote:
Here’s what the AUX LEDs look like on the meter. This is with the optics and a slight Zircon minus green on top so on the CIE graph the LEDs would actually sit just a bit higher.

Do I see what the die/phosfor of the ice-blue aux leds produce or is some of it also the main leds excited by the blue aux leds?

ToyKeeper
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Pugalo wrote:
There are 151 levels (little ramping steps in your firmware), level 151 is TURBO.

There are 150 levels.

When setting the ceiling, 1 click sets it to 150. 2 clicks set it to 149. 3 clicks for 148. And so on.

Pugalo wrote:
Let me repeat my previous question:
Pugalo wrote:
How to set up (to enter in) submenu: - RampCnf (it has 3 submenu): “floor”, “seiling”, “number of steps”? - TermalCnf (it has 2 submemu): “current temperature”, “temperature limit”?
Please answer this question. P.S. I mean: 10 clicks from OFF to thermal config, but how to enter in its submenu: “current temperature”, “temperature limit”? How much clicks I must to do in thermal config menu to change “current temperature” and “temperature limit”? I can’t change these values.

I’m still not sure I understand the question, but this is how I recommend configuring that:

  1. Look at a thermometer. Mine says 22 C, so we’ll use this value.
  2. Go to thermal config mode.
  3. Calibrate the sensor: At the first “buzz”, click 22 times to tell the light it is now 22 C.
  4. Wait until the light shuts itself off. If you haven’t changed the value already, this should leave the temperature limit at the default value of 45 C. Otherwise, you could click 15 times at the second “buzz” to set the limit to 45 C. (limit = 30 C plus N clicks)

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I received my D4S from Hank today. XPL hi equals on happy fat guy in a wheelchair. Civil twilight at 8:24 pm EST. Toykeeper and all involved THANK YOU VERY MUCH!!!!!!!!!!!!!!!! All caps very intentional

Boots
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So, is the XML HI worth the $18 upgrade and is that how you get the 4K lumen?

I’m not worried about throw. There is nowhere in my yard that is further than roughly 500 feet before the treeline.

If I need more throw than that, I’ll grab the D1S or the BLF GT.

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I definitely think so. Again THANKS to all who developed this!!!

strayz
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Mine just arrived as well.

Happy Strayz….

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Nice . I am loving it too.. 4 or 5 years ago, this kind of light cost around $230, and output around 3000 lumen..

Mid $60 is hella a deal, and you are getting 5000 lumen..

strayz
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Going to need more 26650’s this waiting for a cell to charge stinks… I am thinking I need to order 3 more.

Side note, turning the aug leds to high is a lot brighter that I thought that they would be. Smile

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TK said they were usable for a night pee streak, albeit a bit variable in beam.
Guess it won’t bear up to evaluating your kidneys’ processing of local brews.

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I find the low aux LED mode works well as a replacement for tritium vials. The high mode is more like a blue moon mode with longer runtime and a weird-looking beam.

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