Lumileds Luxeon V, test of a 4000K 70CRI emitter

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djozz
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Cool Cool Cool
djozz
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When will they be on your website? I’d like a few of those.

led4power
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Send me your address to PM, I wanted to send you a few  anyway.

 

djozz
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Thumbs Up PM sent. I will do a new Luxeon V test on this boards and am really curious how much different it is. My guess: slightly better performance but way easier reflow!!

Have you tried a Luxeon V in a flashlight yet and if so, what is your experience?

Jensen567
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Will that be for sale on your website soon? Looks good! Really want to see this emitters potential on a properly sized board.

luminarium iaculator
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Thank you very much Sir!

Another test that saved my wallet…

Modding is making something how you want it to be, not how it comes stock...

Old-Lumens

Pok
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I plan to use this LED to my DIY host zoommy, because It has almost round LED.

led4power
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@djozz

I'll build Convoy S2+ with LD-A4 this weekend

@Jensen567

Yes, I'll put boards on my web page very soon.

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Hey Neven,
Nice board!
Will you have the LEDs for sale too?

2Q19

TheOnlyDocc
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Hope that the boards and a high bin Luxeon V will be available in your shop. Can not wait to do a Q8 mod with this leds on DTP boards!

New WildTrail (former LuckySun) D80v2 Sale has Started http://budgetlightforum.com/node/66255

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Nobody dedomed it yet?
I’m really interested in whether it throws better than SST-40…

djozz
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Agro wrote:
Nobody dedomed it yet?
I’m really interested in whether it throws better than SST-40…

As mentioned in the OP, my predictions for the luminance gain after dedoming (if at all it works) are not good, this being a flip-chip design.
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I think it could be interesting in triples and quads, though it depends on the actual die size.

led4power
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 Finally added PCBs (and LEDs:) to webshop:

Luxeon V: link

L4P 4040 DTP 16mm for Luxeon V : link

Note: since I'm on vacation until next Friday, orders will be processed and shipped after 13th October.

 

Jerommel
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Thumbs Up Thumbs Up Thumbs Up

2Q19

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Wouldn’t this LED be a good choice for FET driven 3x AA lights (e. g. Convoy X3, powered by Eneloop cells)?

djozz
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That is a good price for the DTP board for a Luxeon V.

I got my led4power 4040 boards in (thanks!) and did test the Luxeon V on this dedicated board, I will try to crush the numbers this weekend and post the result. In short: I found hardly a performance gain (very slightly though), but the ease of reflow makes this board well worth using. I expect the reliability to be higher as well.

I did one not so great mod with the Luxeon V, I put one in a Olight S15 (AA) flashlight and hoped that the low Vf, and thus less voltage difference to boost, would increase the current and output compared to the stock XM-L2. But it is apparently not that simple, instead, I found just 180 lumen with the Luxeon V, compared to the ~250 lumen of the stock XM-L2. It must be something measured different in the electronics that makes it get less current.

The VG10 with the direct driver and Luxeon V is still one h*ll of a light, great beam, great tint and with a half-drained 30Q it still puts out 1700 lumen (at still 6.5A current, 75lm/W flashlight efficiency).

Edit: some numbers corrected and added

djozz
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With these leds available for well over a month (now at RS-online as well), are there more experiences out there using these in flashlights?

Jerommel
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djozz wrote:
That is a good price for the DTP board for a Luxeon V.

I got my led4power 4040 boards in (thanks!) and did test the Luxeon V on this dedicated board, I will try to crush the numbers this weekend and post the result. In short: I found hardly a performance gain (very slightly though), but the ease of reflow makes this board well worth using. I expect the reliability to be higher as well.

I did one not so great mod with the Luxeon V, I put one in a Olight S15 (AA) flashlight and hoped that the low Vf, and thus less voltage difference to boost, would increase the current and output compared to the stock XM-L2. But it is apparently not that simple, instead, I found just 180 lumen with the Luxeon V, compared to the ~250 lumen of the stock XM-L2. It must be something measured different in the electronics that makes it get less current.

The VG10 with the direct driver and Luxeon V is still one h*ll of a light, great beam, great tint and with a half-drained 30Q it still puts out 1750 lumen (at still 8A current).

I found a similar effect with putting red 660nm and yellow 585nm LEDs in SF-348 lights.
They get less warm too.

2Q19

djozz
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Apparently there’s things about boost drivers that are counter-intuitive.

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Isn’t it that the driver is just constant current and the only benefit from low Vf is longer regulation and (if present) higher efficiency?

Jensen567
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At least that would be some crazy efficient 180 lumens. Will be placing an order for the boards and emitters soon.

djozz
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Jensen567 wrote:
At least that would be some crazy efficient 180 lumens. Will be placing an order for the boards and emitters soon.

I’m not totally impressed by the efficiency, I measure 2.4A at the tail, an Eneloop runs at 2.4A at around 1.25V, so that is 3W of power and thus 60lm/W. For a light that needs boosting from a NiMh cell that may be alright actually, but at least some of my flashlights with li-ion cells go over 100lm/W.
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That is disappointing, wonder if that is down to the boost driver or the emitter. What does the XM-L2 pull from the tail?

djozz
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Jensen567 wrote:
That is disappointing, wonder if that is down to the boost driver or the emitter. What does the XM-L2 pull from the tail?

Never measured that, this is already the third emitter in this light.
Anyone with a stock S15+clamp meter+thick copper loop?
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djozz wrote:
… an Eneloop runs at 2.4A at around 1.25V …
After reading this I would like to repeat my question:
“Wouldn’t this LED be a good choice for FET driven 3x AA lights (e. g. Convoy X3, powered by Eneloop cells)?”

I am thinking of a bright flashlight with NiMh cells for my son.

Lexel
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I guess that’s not so good, as the low Vf leads into pretty high current for NiMh on DD drivers
for a regulated driver this LED is good

Jensen567
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Would be great for something like the Sofirn SF11 or Lumintop SD4A which are 4xAA lights with a buck driver. Should give nice long runtime.

Flashy Mike
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According to HKJs’ review Eneloop 1900 mAh delivers a current of 5A at 1.1 V, which (with 3 cells in series = 3.3V ) meets djozzs’ numbers pretty well (5A at 3.25 V for 1800 lumens).

Lexel
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Yeah but you loose quite a lot voltage and the efficiency goes down

5A is a lot from AA NiMh

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