Review: Solarforce L2X ext. + KD XM-L U2 high-voltage 1-mode drop-in


Solarforce L2X extended + Kaidomain Cree XM-L U2 3-18 V 1-mode drop-in

Reviewer's Overall Rating: ★★★★



Summary:

Battery: 2x18650, 4xCR123, 4xRCR123
Switch: Reverse Clicky
Modes: 1
LED Type: Cree XM-L U2
Lens: There seems to be one
Tailstands: Yes
Price Payed: 26$ for the host, 16,50$ for the drop-in
From where: Host: http://solarforce-sales.com/product_detail.php?t=FB&s=6&id=16 Drop-in: http://www.kaidomain.com/ProductDetails.aspx?ProductId=11249

Pros for host:

Build quality (with reservations)
Heat dissipation abilities
Output vs size
Distinctive looks
Very good grip

Cons for host:

Not pocketable, hardly holsterable
Siderolls if not modded
No place for lanyard as standard
Ugly standard bezel
Lens not coated and shatters easily (if abused)

Pros for drop-in:

Bright
Simple
Great voltage area, can be used from 2AA(A) to something silly like 6xCR123

Cons for drop-in:

Generates lot of heat (like all XM-L:s, I suppose)
One trick pony

Hello. My name is HID45 (it's not my real name) and I've developed an addiction for flashlights. It's just started, but it's getting worse. I've recently began hunting and found out that in the dark forest one needs light. And so it began. I got myself a couple of medium to high priced lights and was happy with them until I saw the Solarforce L2X extended. I pulled the trigger before thinking twice and afterwards found out that the choises in high voltage drop-ins in XM-L, P7 or SST-50 region are limited. So, I asked help from You, and was directed towards this item. http://www.kaidomain.com/ProductDetails.aspx?ProductId=11249 Went for it, it came today and let's see what we've got. I see no point in making two different reviews for the host and drop-in, so I'm doing a combo.

First I must make clear that I'm an total noob in flashlights, inexperienced in electricity in general, my photography is awful, my english is medicore, I typo a lot and got a sense for sarcasm. But try to bear with me. (after beating myself, I must say that I am decent IPSC shooter and quite a good floorball goalkeeper...)


Features / Value: ★★★

Nothing much to report on the feature department. It's a basic, well made budget 2x18650 host with one mode drop-in. Pretty straightforward stuff. It's not an all-rounder by all means. But what it does, it does well. And that is delivering masses of light and keeping going for long time. Although I got to point out that unlike your basic P60 host, this actually would make a decent makeshift self defence item. It's long, heavy and propably sturdy enough to deliver some damage. But this is of course purely speculative. I would never use or advice to use it in any kind of combat. That's just silly. If one is going to a place where extra protection is needed, it would be better to grab something that shoots lead instead of photons. Where allowed by law. Here it is not.


Design / Build Quality: ★★★★

Anodising is impressive. Full stop. Not any of that "price point considered" bs. Overall finishing is on par with my 4Sevens Turbo 18650 (which is my only "high end" light to compare to). Head threads came lubed, but tail end was dry. One drop of CLP took care of that. There's double o-rings at the tail, one at the head. I didn't do the sink test, but I'm sure it would pass it easily. I did run water over it from the tab, no problems. The torch feels solid and durable and because of the ridiculous knurling, it sticks to hand regardless of the environment. It rains here now and we have some snow also, but even being wet, cold and snowy the grip is very firm. Unlike the 47's, in which the knurling is way too shallow and it will slip on first sign of moisture or cold.

One thing I don't care about is that the inside bore is bit on the loose side. Inside diameter is 19,0 millimeters. For example is 4Sevens 18650 tube it is 18,8mm and Solerforce L2 has 18,9. Small differences, but they count. L2x is kind of clonky with two Trustfire flame 18650's. Those buggers are narrow. Loaded with my trusty Cytacs it is ok, but still makes an occational "clonk" if hit against hand etc. In real world use it's silent on Cytacs. Don't know it they designed it that way or if it's just out of specs. I think those Flames might be off-spec too. But still, at least my L2X has slightly larger inside diameter than my other 18650 / 2x123 lights.

Other problem is that as standard, the torch siderolls. There is nothing to stop it, as it's missing the normal P60 host bolt-like thingy at the head. But that's easily fixed with some shiny goodness. The looks are also quite dark, being all black. It really needs some contrast (shiny goodies!).

Compared to L2 and Trustfire flame 18650

Here with them shiny bits

Some details

This is a very sweet combination. You think that that shouln't work? So did I. But it does!



Battery Life: ★★★★★

Kind of hard to judge, as it only has one level. 4Sevens Quarks are claimed to run over a month on moonlight mode. This will go on for about three hours. But for those three hours it's bright bright bright. I measured 3 hours and 15 minutes (of which 2,5 hours continuously) on Cytach 2600mah 18650's. Don't have a luxmeter to measure the brightness, but it was bright untill protection kicked in and measured 3,17v for the other cell and 2,91v for the other. Yup, that's HID45 giving his cells the hell so you don't have to.

During that 2,5 hours of continous burn, did the torch get hot, I hear You ask. Well, it indeed did. Was it too hot to handle? Well no, sir, it was not. The body was warm all over, but I could squeeze it in my fist as hard as I could with no problem. The head is a different story. Now that sucker was hot. Not too hot to touch, but definetly too hot to fully fist-squeeze. I did wrap some al foil to the drop-in before testing. Don't know if it made any difference.

Added 22.4.2011: Tested runtime with 1xCytac 2600mah 18650 using regular L2 body and L2X head. Partly due to expected overheating, partly because I broke my other lens by dropping a battery in to an empty tube, thus shattering the glass. Results were quite surprising, to me at least. It started with 4,25v (which is more than I would care, charger seems to overcharge a little) and 1,90 amps. Brightness was similar to 2-battery setup to my eye. After 5 minutes the light was pretty warm. At 20 minutes voltage had dropped to 3,94 and battery was pushing 1,62 amps from tailcap. Still very bright. The heating peaked at about 45 mins. Body was very warm, head hottish but not nearly as hot as with 2 battery. After that the torch cooled down as voltage dropped but remained still above hand warmth level until cut-off. The output faded from that peak point too, but still maintaining usable level 'till the end. At 1,5h it was still pushing 1,10 amps and 3,60 volts. At two hour mark results were 0,85 amps & 3,4v. It finally died at 2,5 hours and 3,27v. So as a conclusion for 1 battery setup: about 45 mins of very bright light without serious overheating issues, after that degrading but usable amount of light for up to total of 2,5 hours. That's longer than I thought and this drop-in seems to be very usable also in 1x18650 setups. Not best alternative if there's to choose from, but for example as a backup for almost every common voltage level it's just brilliant.

It draws 1,90 amps at the tailcap from fresh 1X18650 @ 4,2v and 0,84 amps from 2x similar dose.


Light Output: ★★★★★

Can't measure, so hard to tell. Not 1300 lumens as advertised. Hardly even 1000. But maybe round 700 or something. It is bright allright. Some bad photos...

On the left corner: 7Sevens 18650 Turbo with fresh Trustfire flame. On the right corner: KD XM-L U2 1-mode drop-in running fresh 2xCytac 2600mah 18650's

Left: Shiningbeam S-Mini Neutral white. Right: KD XML U2

And finally, outside shot of KD XM-L U2 high voltage drop-in 2x18650. No comparison shots, sorry...

I do not put a picture of the drop-in, as it looks like pretty much like all the other generic drop-ins there are. Check it from KD site if needed.


Summary: ★★★★

As said, what it does, it does well but it's not an all rounder. Drop-in is bright and can be used for lot of voltage options. It's quite cheap and good value, if you can live with one mode. Host is well made and gives good runtime on high output. I will not use it as only light on my hunting and camping trips, but combined with a Quark 18650 Turbo, they make a perfect duo (ok, they would be perfect if at least other would be either neutral or warm...). One pocket thrower which has ridiculoulsy low low and one mini sun (ok, now I'm exaggerating, have to tone it down) to light things up when needed.

Thanks for the review .

Cool

HID45, Outstanding review! Very well written. I'm not sure why you consider your english mediocre, you write better than a lot of the engineers I work with . Also, I think you left off one "pro" for the light - It can be used to tenderize meat!

(btw, you reminded me that I should really look into IPSC. I've shot Bullseye for a long time, just haven't made the switch).

Again, nice work!

I think this light is totally bad A! Think of the battery options with that 18 volt U2. This is one very cool flashlight and for what, $43? Interesting that solarforce-sales shipped it in that box. Didn't their stuff used to come packaged like that - at higher prices?

completelybitchintorchFoy

Hi there HID45, excellent review! I agree, I would never guess that you're not a native English speaker if you hadn't told us. Great details, nice chatty style, and nice pictures too! You made the frontpage. And sticky.

So, I have been looking at Solarforce P60 hosts. I'm trying to decide between the L2x (not extended) and the L2p.

Does the switch allow for tailstanding? I imagine that this one is too tall to tailstand, but do you think the regular L2x could tailstand?

Would you describe the beam as throwy or floody?

Thanks again! Well done.

Awesome review HID45!

Nice review. So does this light take pretty much any P60 dropin that can handle 8.4v?

If so (other than longer run time) it sounds like it should throw just like a 'regular' Solarforce L2p or similar. Is that correct?

Thanks for your kind words. This light will tailstand. It's not very stable, but on flat and even surface, no problem. Here's one picture I dropped from the review as I did not like it.

The shorter one will definately tailstand. Beam is floody. It throws about same than my Quark Turbo, which is decent XP-G R5 small thrower rated 230 lumens OTF. But besides from the hotspot, everything else is significally brighter with KD XM-L. In the outside photo, the last visible trees are about 60 meters away. I could actually see father, to about 80 meters down that trail, but the camera did not catch that.

The box (where the torch came in) is actually very nice. It's very thick cardboard with shape-cut styrofoam insert and the lid actually has two magnets for retention. It really gives great first impression when opening the package.

And troop, you are correct. It will take any P60 drop-in rated for enough voltage to handle at least 2x18650. The advantage over a normal lenght host being the runtime. I also tried the drop-in in normal L2, and my Eyeball Mark II "the 4-eyes edition" could not detect any difference in output vs extended.

Match, do go for the IPSC (or USPSA as I think is called over there). It's super fun. I tried different ISSF sports and bullseye as well as metallic silhouette, but didn't have the patience required. I also shoot skeet and trap non-competitively. Those are lively enough for me.

It's just as bright with a single 18650? As bright as a 4.2 volt T6?

if?isstoopidpleasedontslapmedownFoy

I could not see the difference in output in 1 vs 2 battery. Did not try runtime on 1 battery. I suspect the output might start do fade sooner. But for the about 5 mins I kept in on with 1 batt, it was bright allright. Wouldn't know about difference to T6, as I don't have one. Yet. (or actually I do have T6 emitter and driver and host, but no extra pill. have one coming, thou)

Did some further run-time testing today with 1x18650. I edited the first post so one finds all the information in one place. This is what I added:

"Tested runtime with 1xCytac 2600mah 18650 using regular L2 body and L2X head. Partly due to expected overheating, partly because I broke my other lens by dropping a battery in to an empty tube, thus shattering the glass. Results were quite surprising, to me at least. It started with 4,25v (which is more than I would care, charger seems to overcharge a little) and 1,90 amps. Brightness was similar to 2-battery setup to my eye. After 5 minutes the light was pretty warm. At 20 minutes voltage had dropped to 3,94 and battery was pushing 1,62 amps from tailcap. Still very bright. The heating peaked at about 45 mins. Body was very warm, head hottish but not nearly as hot as with 2 battery. After that the torch cooled down as voltage dropped but remained still above hand warmth level until cut-off. The output faded from that peak point too, but still maintaining usable level 'till the end. At 1,5h it was still pushing 1,10 amps and 3,60 volts. At two hour mark results were 0,85 amps & 3,4v. It finally died at 2,5 hours and 3,27v. So as a conclusion for 1 battery setup: about 45 mins of very bright light without serious overheating issues, after that degrading but usable amount of light for up to total of 2,5 hours. That's longer than I thought and this drop-in seems to be very usable also in 1x18650 setups. Not best alternative if there's to choose from, but for example as a backup for almost every common voltage level it's just brilliant."

Mr.admin: for what my opinion is worth, I absolutely love my l2x! It is nothing but high quality . I especially like it with the stainless bezel and lanyard ring to accent the black. And it tailstands like a champ. The dual o-rings at the tailcap are a bonus for me as well!:slight_smile:

With the Skyline 1 which has similar but less aggressive knurling, I hate the feel of it in my hand - in fact I'd wear gloves to handle the thing. The L2x looks like a real pocket/holster shredder.

YMMV though.

I have exactly setup, however, my driver provides only 0.89 Amp :(

Have you disassembled yours? Do you know its design (my is build on one YB1682 chip, which accoridng to its documentation must provide 2A)

Anybody has an idea how to fix the problem?

Thank you.

Mine pulls 1,90 amp from 4,2V (1x18650) and about 0,9 from 8,4V (2x18650). That's how it's supposed to function, isn't it? When voltage doubles, amperage halves.

Constant power: P=IV

Oooops, stupid me :)

Your argument is perfectly reasonable, HID45.

Thank you.

Right, I forgot some basic laws. Thank you for your help.

Any way, the driver in this mudule is built on a single YB1682 buck converter that can provide only 2A current. Obviously, such current is insufficient even for 900 lm, let alone 1300 lm.