TK's Emisar D4 review

they dont sell the frosted optic anymore? on intloutdoor…

I purchased one a while ago, but it’s not available on intl-outdoor as option anymore.

I stand corrected, I understand what Blue was saying now. But to poke at this a bit further, is the Vf at 0.35A really above 3V, and in the D4 now we are talking less than 0.1A per diode. I’m still thinking you are not staying in regulation on a rechargeable li-ion battery in a D4 before the voltage is so low it no longer safe to be operating. Guess it is time to investigate the Vf for an XPL-HI led.

These pictures make me want to buy a bunch of bare LH351Ds. I haven’t tried that emitter yet.

The discussion is considering small differences, but here’s some data that addresses your next question:

Interpolating Texas_Ace’s data to 350mA, that would be 2.84V.

Thanks, looks like roughly 2.74V of diode voltage for more than 0.1A of current (as the 0.35A gets split to 4 LEDs), and supposedly 0.12V across the 7135, so the light will regulate down to 3V easily at the full 0.35A going through 4 diodes. BlueSwordM is correct, but I’m guessing most of us are not planning on using batteries at less than 3V consistently.

Does it take a week to ship? I ordered a D4 last friday, and 7 days later the status is still “processing”. It is in stock, so is it normal or should I start to worry?

Alfas they are on holidays… Wait three days

Chinese New Year. Everything ordered during the holiday ships after it ends.

Hm… Iam near to order this light with xpl leds… They dropped the price again or is it the old dropped price? The xpl version owners-whats the runtime on turbo? I got the samsungs, so probably cant get more from any othet 18650…

Runtime on turbo depends mostly on the battery you use, and the level you set the thermal limit to. That’s just how direct-drive modes work; the battery’s type and condition are a huge factor. However, in most cases, it’ll still typically be under 30 seconds before the first step-down.

30 seconds to first step-down? Unequivocally? So a week (or so) ago, in the Northeast US, at –35ºF ambient and with a strong wind, the light would still step down in 30 seconds?

Devil’s advocate…

I hope I did not misunderstand your post :smiley:

there is no 30s hard limit. I used my D4 in the snow some days ago, no stepdown at all because I dipped it in the snow every now and then :smiley:

its purely dependent on temps.

Oh, I’m very well familiar with where the limits are… was just saying that there are variables, that’s all. :wink: Basically pulling TK’s chain as it were. lol Different ambient temperatures, different humidity levels, different wind levels, a different grip on the light… a lot of things come into play as to just exactly how long Turbo will go before stepping down if it steps down at all. She’s right though, of course, in most cases it steps down pretty quickly…

she said under 30s though

Which probably and comfortably covers 90%+ :smiley:

My D4 Titanium is in short body form, with an Aspire 18350 and Samsung LH351D 80 CRI 5000K emitters. I KNOW it’s going to heat up fast in Turbo, so I don’t use Turbo much at all. I have bigger more powerful lights if I think that level of output is going to be needed. :wink: I also have Anduril flashed so I can limit the ramp ceiling to a reasonable level without having to think about it in use. A double click changes everything of course, whole new ball game….

Edit: As an aside, my green D4 is also in short body format, with green output XP-E2 emitters. I had thought that these emitters would not pull enough to heat up strongly but boy was I wrong! Tint shifts very noticeably on the green output and heat comes in hard and fast in Turbo so again, I have Anduril ramp ceiling set relatively low and just seldom double click into Turbo. :wink:

I have one of my D4 with 219b and Anduril, and as you say, without the ceiling these run into thermal problems way too fast. So no IMR for this one :slight_smile:

oh oh…buy or not to buy:))

This picture kills me. It reminds me of mama, papa and little one…and one of the adults needs to get on a serious diet plan.

:confounded:

Curious…I like the flood of all those emitters right up to the glass but I’m curious, has anyone done the same thing with a much bigger light?

You want lamps that heat up fast? Get the Nicha’s. LOL. I have them and while they are nice they get hot way to fast.