XP-L2

[djozz]

@RMM

Just did a current draw test:

• FET driver w/ XP-L2 V5 4000K on Noctigon w/ HE2 fully charged: 8.2A!

• FET driver w/ 3x XP-L2 V5 4000K on Noctigon w/ HE2 fully charged: 15.2A!

Better make sure you’ve got your heat sinking and reflow right!!! These have low vF similar to the 219Cs.

Ah, so that is the deal, low Vf, nice for single cell multi-emitter lights! (if you like output, that is )

[MRsDNF]

Nice update guys. Thanks. :+1:

[The_Driver1 (The_Driver)]

Thanks Guys!
The low Vf should substantially increase the efficiency at higher currents even it the LED isn’t actually brighter compared to the current XP-Ls.
You probably all know this, but it will be much easier to make a single cell light that stays in full regulation at 3A+ for the entire runtime (currently very few lights, mainly from Zebralight and Armytek manage to do this).

[Tom_E]

Very good point. I should have known that, but never thought of it that way. I got my head in the high amps/max output mode most the time, but that kind of usage on 7135 based drivers, for example, is pretty darn good.

[Texas_Ace]

Has anyone seen 90+ CRI XP-L2’s yet?

I just looked through the places I know to check and could only find 80cri. Thinking this could make for a pretty nice EDC LED with a bit more power then what I have now.

[djburkes]

@RMM

@djburkes

Well…I wouldn’t go buying any XP-L2s anytime soon. I got 4 in today, planned on using one of them in a S2+ host and the other three in a X6 triple. They may be fine in a triple but they aren’t worth a crap when used as a single led on 16mm noctigon in combination with a fet and a 30Q or VTC6. They just turn blue and die in turbo mode. I’ve got two left, I don’t know how much it costs to ship to Amsterdam (I have djozz in mind) but I would like to send these to someone that has the equipment to test them so no one wastes their money on something that’s not going to work for them.

I just got some 4000K V5 binned XP-L2s in and have been testing them for a few days. I have one set up with an FET driver in an S2 host and it doesn’t turn blue at all with a VTC5 or HE2 and the output drop on the meter is consistent with other LEDs I’ve tried. There is a definite tint shift around the hotspot and spill, but not nearly as bad as XP-G3. These are usable in smooth reflectors, but not as good as XP-L because of the tint shift.

They are a tight fit, but I put them dome on under some unmodified Carclo 10507 optics and the domes haven’t detached yet after several 80C+ body temperature runs. The tint shift is much less noticeable in the triples, but still there (we already knew this from XP-G3). I haven’t tried them with other Carclos yet, but if you do be careful because the cup shape is a bit different on all of them.

All-in-all these aren’t a really big deal…an incremental upgrade at best, but as with the XP-G3 we’re giving up something in return for more lumens (beam quality and ability to dedome).

Well crap, I don’t know why the ones I had died on me then. The remaining two that I had are in route to someone to test…it may have been a crappy reflow?…but it was on two different mcpcbs and they both have XP-L V6s on them now and run fine…so I don’t know.

[RMM]

dj, I'm not sure what was going on then because I have run these very hard repeatedly with no signs of thermal stress. Maybe yours had extra low vF? Did you measure the current draw or forward voltage?

[pilotdog68]

How many lumens you think it is doing at 8+ amps ?

[Mitko]

@pilotdog68

How many lumens you think it is doing at 8+ amps ?

Like 2250-2300( v6 sample, Mouser breed, kit 51), yet it runs hot like hell…i aint quite sure how long how it will hold those on a long term base
G3 isnt much of a high amp long term champ, they die pretty fast( personal exp)

The most annoying is that they dont dedome, thus makes them useless fro throwers

[RMM]

@pilotdog68

How many lumens you think it is doing at 8+ amps ?

I'm only seeing 1500-1600 at startup OTF, but that's non-AR w/ an OP reflector. 1400+ after 30-60 seconds. I'd believe 1900-2000 LED lumens if you could keep it cool enough.

[djburkes]

@RMM

dj, I’m not sure what was going on then because I have run these very hard repeatedly with no signs of thermal stress. Maybe yours had extra low vF? Did you measure the current draw or forward voltage?

Nah, I don’t have a very good meter and I’m doing (what I consider to be) “ok” with a meter if I can measure battery voltage, lol. I’ll let you experts handle that end of it all. I probably need to go back to the drawing board and start off with this to learn about current, lol.

[Texas_Ace]

I just received a package from DJ :partying_face:

Hopefully I will have some time later today to see what was up with his emitters and get some hard numbers.

[djburkes]

@Texas_Ace

I just received a package from DJ :partying_face:

Hopefully I will have some time later today to see what was up with his emitters and get some hard numbers.

I’m going to lean towards crappy reflows, especially if RMM is running one dd with no problems. That just means I’ll have to stick with getting them from RMM already reflowed, lol…which is what I normally do any way.

[Rufusbduck]

The reflow may be part of it but a poor mate or a bit too much heat sink compound can be worse than none at all, the stuff’s supposed to fill the gaps where the metal surfaces don’t touch rather than create a film between the surfaces. Extreme current exacerbates the effects of thermal blocks. DTP copper is the best initial step available but that isn’t the whole picture.

If you’ve modded you’ve probably killed a few LEDs, at least yours DJB died in the persuit of knowledge. Every new led throws us a curve or two, the fun is in finding what they’re good or not good for.

[Texas_Ace]

I am in the middle of torture testing one of the XP-L2’s at the moment, took a break for dinner.

A sneak peak though. Already at 10 Amps and the highest numbers I have ever seen from a single die LED, VERY impressed so far.

The question is, do I keep pressing it even though I have reached a 4.2V VF until it pops or do I whimp out and call it quits?

[Enderman]

@Texas_Ace

I am in the middle of torture testing one of the XP-L2’s at the moment, took a break for dinner.

A sneak peak though. Already at 10 Amps and the highest numbers I have ever seen from a single die LED, VERY impressed so far.

The question is, do I keep pressing it even though I have reached a 4.2V VF until it pops or do I whimp out and call it quits?

Really? How many lumens?
The SST90 can do 4000+ from a single die

[Texas_Ace]

@Enderman

Really? How many lumens?
The SST90 can do 4000+ from a single die

Well I said that I had ever seen, as in that I have ever had on my sphere.

[The_Driver1 (The_Driver)]

@Enderman

@Texas_Ace

I am in the middle of torture testing one of the XP-L2’s at the moment, took a break for dinner.

A sneak peak though. Already at 10 Amps and the highest numbers I have ever seen from a single die LED, VERY impressed so far.

The question is, do I keep pressing it even though I have reached a 4.2V VF until it pops or do I whimp out and call it quits?

Really? How many lumens?
The SST90 can do 4000+ from a single die

When you drive it at double the current…

[Enderman]

@The_Driver

When you drive it at double the current…

Well yeah, you obviously don’t get lumens for free…

[Texas_Ace]

Ok, Just posted the XP-L2 test from today:

XP-L2 V5 Output & Death test by Texas_Ace Over 2200 lumens! Still worked after 15 Amps!

Ok, this is the first official release of an LED test from my setup. I have a few others already complete that I will be releasing as I get the time to make the charts all pretty and ready for upload. Cliff notes version - My sphere and setup is finally calibrated to a level that I feel good about releasing numbers from - I figured out how to turn a PVC sphere into a true integrating sphere that reads the lumen value directly on the lux meter so no math is involved - The lumen readings line …

I gave it over 15 amps but it still lived! It was hurt but still lit up. At over 70W of power it literally cooked the dome right off. This is one way to dedome them I suppose!

I am amazed at just how much power this thing can handle. It didn’t even peak until 10A!

From a cold start it made 2450 lumens @ 10A! Hot it was 2280 lumens!

Remember this is only a V5, they have V6 and maybe even W2’s on the way that could net an honest 2500 lumens from a single die LED!

Be sure to check out that thread, I want to standardize my test setup before I release anymore LED tests.