From their respective websites (lenght must be Chinese and Russian for length):
I’m interested so see if the 1mm difference in diameter is real and significant.
And, yeah, the less aggressively driven Unicorn does make it more muggle-friendly and appealing to me. Maybe it won’t need to be physically locked for pocket carry.
The total throw on turbo might be similar to a D4, but only because the D4 uses a lot more power. The candelas per lumen should be much higher on the Unicorn, allowing it to throw farther when the lumen levels are the same. In other words, it’ll probably have a much narrower hotspot.
Not sure what the exact cd/lm value will be, but usually I find that the ideal range for EDC purposes is about 5 to 10 cd/lm. The D4 generally gets about 3 to 5 cd/lm, so it’s slightly more floody than I’d like.
I hear the FW1A is moving along too, which has a similar purpose… but it uses a reflector instead of a TIR optic. And with XP-L HI, it’ll probably be even more throwy, like perhaps 10 to 15 cd/lm.
Shhh, you’re telling all our secrets!
let see what YLP got here…kind da interest… LH351D something that i dont own…
What kind of driver is YLP using?
Is it a linear FET driver or a buck driver?
Very very interested with this one. so far three YLPs already in the cart. I hope it uses an efficient buck driver and has flat runtime unlike Folomov 18650.
+1 YLP for sensible max output with thermal regulation.
And pleaseeeeee, NO FET driver for this one.
[Clemence]
@clemence, a linear FET driver is a linear driver that uses a FET linearly by varying its resistance.
Basically, it’s a constant current linear driver with no PWM needed and higher LED efficiency.
This sounds very interesting. I love the LH351D’s in my BLF SP36.
FW1A?! Nice.
Yup I know. I meant no linear, linear + FET, or linear + FET + PWM (worse). Simple buck drivers already cheap these days.
[Clemence]
Is this what LED4Power is using?
I like the looks of this one! Looking forward to your review!
Anybody ordered one yet? Looks interesting even though I’m not a fan of single tir lights.
If I understand correctly, it’s a linear FET. As INFERION said in the Unicorn thread, “Initially, there was an impulse (boost). YAL will have a linear (without PWM).” So it was originally going to use a boost driver, but was changed to a linear FET. The firmware’s UI diagram is named Indigo_Linear_UI.png, and he was talking about using an opamp. It’s all there in the thread for anyone who wants the details.
It looks like it’s using an attiny85v in a QFN package, plus a small FET running in linear mode. The FET seems to be a Vishay SiA448DJ. That info is from December though, and may be out of date.
There is Attiny25 in Unicorn.
There are several versions of user manuals: short , full and from Inferion himself last two only in Russian 
Small review
And several graphs
Termal regulation test 1
2
Thanks for the extra details, AEDe. I’ve been getting information from blurry photos and automated translation sites, and the information isn’t always clear.
I wonder why he used t25 instead of t85 like the Meteor. It seems like a strange step backward.
Advanced English manual is here:
Yes, but a good linear driver (for one-LED flashlight) will be better for flat regulation than a cheap buck driver =)