TK's Emisar D4 review

[battery]

@zak.wilson

The D4 has significantly lower resistance than the S41. That means more current, and the 219B won’t respond in a good way to that. Tint will get cooler, CRI will get worse and the emitters may be damaged. A 219B D4 without adding a resistor to the circuit doesn’t seem like a good idea to me. 219Cs do come in 90 CRI though, and they still have nice tint and CRI when driven crazy hard. Some do prefer the tint of the 219B (I’m one of them), but the 219C is getting tint deviation bins, so it’ll be possible to order more rosy versions.

I was under the impression 219 emitters increased in CCT and CRI at higher drive currents.

[maukka]

@battery

I was under the impression 219 emitters increased in CCT and CRI at higher drive currents.

Here’s data from a couple of emitters installed in a Thrunite TC12 so not seriously overdriven

219B 4500K sw45k R9080
Mid: 4490K CRI97
High: 4466K CRI97
Turbo: 4595K CRI93

219C 4000K CRI90 R9050
Mid: 4142K CRI92
High: 4239K CRI90
Turbo: 4197K CRI89

Stock emitter XP-L
Mid: 4461K CRI73
High: 4469K CRI72
Turbo: 4572K CRI72

Here’s a 219C CRI80 triple driven a bit harder
100lm: 4648K CRI86
500lm: 4773K CRI83
2200lm: 4862K CRI84

Here’s a 219B R9050 in an Astrolux S41
Mid: 4660K CRI91
High: 4670K CRI91
Turbo: 4710K CRI93

[Agro]

@ToyKeeper

@Agro

Has anyone found a diffuser that would work with it?

You can use a different Carclo quad optic with diffusion built in. Or put DC-Fix on the lens. Both work.

Sadly, neither is easy to remove in the field.
Overall I find D4 somewhat too floody and I don’t want to diffuse anything. But for a camping light, a diffuser would be good.

[djozz]

@maukka

@battery

I was under the impression 219 emitters increased in CCT and CRI at higher drive currents.

Here’s data from a couple of emitters installed in a Thrunite TC12 so not seriously overdriven

219B 4500K sw45k R9080
Mid: 4490K CRI97
High: 4466K CRI97
Turbo: 4595K CRI93

219C 4000K CRI90 R9050
Mid: 4142K CRI92
High: 4239K CRI90
Turbo: 4197K CRI89

Stock emitter XP-L
Mid: 4461K CRI73
High: 4469K CRI72
Turbo: 4572K CRI72

Here’s a 219C CRI80 triple driven a bit harder
100lm: 4648K CRI86
500lm: 4773K CRI83
2200lm: 4862K CRI84

Here’s a 219B R9050 in an Astrolux S41
Mid: 4660K CRI91
High: 4670K CRI91
Turbo: 4710K CRI93

Nice data! The trend is a bit lower CRI when the leds are overdriven, but that would be too easy of course so with the last measurement it is the other way around :party:

[maukka]

After getting to know the new sphere a little better (adjusting baffle and auxiliary light, trying different input port diffusers etc) my numbers for the D4 got about 8% higher.

Max output is as follows:
VTC6: 3345 lm (480 lm at 30 sec)
18650GA: 2980 lm (895 lm at 30 sec)
Aspire 18350: 2880 lm (1570 lm at 30 sec)
Efest 18350: 2460 lm
Enercig 18350: 2630 lm

Here’s the new graphs

[leestrong]

Thanks maukka, excellent data, as always. 100% 7135 efficiency is surprisingly low, I thought it is above 100lm/W, maybe I have over estimated the efficiency of 7135.

Am I too greedy to wish for a 1+N+FET driver to be sold in separate / available in new versions, I’ll be happy with N >= 4.
DrJones H17F Driver from MT Electronics seems nice, not sure if it fits.

[hIKARInoob]

@leestrong

Thanks maukka, excellent data, as always. 100% 7135 efficiency is surprisingly low, I thought it is above 100lm/W.

I have been wondering about this, without giving too much thought. The most commonly known values for efficacy is probably what Cree or Nichia is stating on the spec sheet, meaning light output in lumens per Watt where the power consumption is that of the emitter itself.
Maybe the efficacy Maukka is using is not the power consumption of the led itself, but of the complete flashlight including the cell, where the power value is derived from the runtime? So then you will automatically get a lower efficacy.
Is this the case Maukka?

[zak.wilson (Zak)]

7135+219C is a pretty inefficient combination. The larger the difference between forward voltage and battery voltage, the more the 7135 just burns off the excess as heat, and the 219C has very low forward voltage. Combined with a buck driver, the 219C’s efficiency is much better.

[maukka]

Yes. Depending on the output level/runtime and approximated current draw, I have capacity data in Wh for most of my batteries. Total Lumen-hours over the runtime divided by battery watt-hours gives the lumens/watt. So the calculation takes into account the possible effects of the battery, leds and driver heating up.

[hIKARInoob]

^ Excellent, thanks!

[Tixx]

@patmurris

A few comments about the ramping UI:

I like how smooth and fast it reacts and that the current level stays in memory for the next turn on. However if i set the light to some mid level i like and next use the shortcut to moon for instance (long press from off) and turn the light off, the next time it will also start on moon with a single click - the memorized mid level has been ‘erased’ by moon, even though i didn’t use ramping. Same thing if i fired a quick burst of max output (double click from off) and turned off without ramping. Next time it turns on at max level which may be unexpected and quite annoying.

In both case, the memorized level was forgotten and one of the shortcut has become redundant. I would have expected the memory to persist until some ramping occur.

Another suggestion i would make would be to have an option to limit ramping to a level that the light can at least sustain for a few minutes without stepping down or becoming ridiculously (and possibly dangerously) hot. It’s actually too easy to go overboard with this light. On most lights with a turbo mode of some sort, you have to do something special to trigger it - at least click through the other modes for instance.

I like these suggestions.

[Joey_Adams]

In case anyone is wondering, Richard from Mountain has about 49 or so of these pocket nuclear reactors in stock now. I purchased the last three for my collection (5 so far) last night so if you are in the market for one of these, especially if you live in the US, mountain electronics.com is an excellent place to get them. They tend to sell out extremely fast, so don’t sleep on it if u are planning to buy.

[Tixx]

@Joey Adams

In case anyone is wondering, Richard from Mountain has about 49 or so of these pocket nuclear reactors in stock now. I purchased the last three for my collection (5 so far) last night so if you are in the market for one of these, especially if you live in the US, mountain electronics.com is an excellent place to get them. They tend to sell out extremely fast, so don’t sleep on it if u are planning to buy.

Thanks for the heads up. I have to try the Cree XP-G2 S4 3D ~5000K - Neutral White. The only neutral 5000k and below I have not tried yet and he had them in stock. 1 more left I think.

[travis]

I’m sure Mtn is sold out again.
He only had 2 left last night when I got my “green beauty”.

[Tixx]

@travis

I’m sure Mtn is sold out again.
He only had 2 left last night when I got my “green beauty”.

Availability: 47

[Fuzzylogic]

@Tixx

Thanks for the heads up. I have to try the Cree XP-G2 S4 3D ~5000K - Neutral White. The only neutral 5000k and below I have not tried yet and he had them in stock. 1 more left I think.

I picked up the last Green 3D last night…this forum is a bad influence…

[Firelight2]

@Fuzzylogic

@Tixx

Thanks for the heads up. I have to try the Cree XP-G2 S4 3D ~5000K - Neutral White. The only neutral 5000k and below I have not tried yet and he had them in stock. 1 more left I think.

I picked up the last Green 3D last night…this forum is a bad influence…

Now you need to order a grey and black one. And a 4th one to strip the anodizing off for the polished bare aluminum look! :laughing:

[Fuzzylogic]

@Firelight2

Now you need to order a grey and black one. And a 4th one to strip the anodizing off for the polished bare aluminum look! :laughing:

Already have a grey nichia…now thinking about a black xp-l hi…unfortunately (fortunately?) anodizing’s already coming off on my grey one from the clip scratching it…so yeah, you’re right, I might have to strip it completely and order a 4th to replace the grey . You guys are bad influence I tell ya :smiling_imp: .

[Joey_Adams]

He has 43 left as of right now. I’m not sure which emitters/tint/body colors/ are still available but there are 43 D4s as a total left at Richards site.

[spinynorman]

Ordered my D4/3D from Mtn, at breakfast, shipped by lunch. Can’t beat for service. :+1: