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.
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:
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
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.
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?
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.
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.
^ Excellent, thanks!
I like these suggestions.
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.
I’m sure Mtn is sold out again.
He only had 2 left last night when I got my “green beauty”. 
Availability: 47
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:
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: .
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.
Ordered my D4/3D from Mtn, at breakfast, shipped by lunch. Can’t beat for service. :+1:
I’m NOT ordering a second D4! NOT NOT NOT NOT NOT NOT NOT.
Fine, Skip the second, go right to the Third.
