GB 351D closed.

Bob_McBob · 2018-04-11T19:47:21.000Z

The_Driver:

BTW: I just checked out the dimensions of this LED. The ceramic package has a thickness of 0.43mm (similar to Nichia 219C: 0.4mm). The Cree XP-L and XPL2 have a thickness of 0.58mm, the XP-G2 0.73mm. This can be important when focussing a light and when using TIR optics which seat directly on the LED package are used.

Yep, this is a significant issue with the 219C when the stock optic is designed to seat perfectly on an XP-L HD. Even if the dome is exposed a fraction of a mm it dramatically alters output and beam pattern, especially since the 219C is physically smaller to begin with.

AEDe · 2018-04-12T04:17:12.000Z

All 320pcs are reserved.

g_damian · 2018-04-12T05:51:07.000Z

AEDe:

All 320pcs are reserved.

That was fast

maukka · 2018-04-12T05:53:26.000Z

But as the Wuben TO46R didn’t suffer in output at all compared to the XP-G3 (0.73mm as well), I don’t think it’s a problem with the Samsungs. Unless there was a thicker MCPCB with wide holes that allowed the optic’s feet to sink in deeper.

doubleone44 · 2018-04-12T07:37:26.000Z

Also interested in 5 LH351B

maukka · 2018-04-13T14:18:17.000Z

AEDe also sent me a 3000K CRI90 351B to test. It’s just as good as the 351D. Very nice tint and non visible tint shift. Here’s some measurements at 1 amp with a small OP reflector from the Reylight Pineapple.

CRI data measured from the hotspot:

edit: added tint vs. current graph

djozz · 2018-04-14T22:10:51.000Z

I have sunken deep into this hobby, I made a Jaxman E2L triple (shorty) with the LH351D leds from the OP, with the sole purpose to see how it looks like in the Carclo 10570 optic, and to see how the tint and output compares to the other high CRI Carclo 10570 builds that I have around. Of course I did not mind it to become a nice EDC-light (it is), but that was not the purpose :person_facepalming:

Ok, some data: E2L shorty with LH351D 4000K 90+CRI leds on Jaxman DTP-board, everything thick wire and bypassed, BLF-A6 direct driver, 630nm red tail leds for the good looks.
Output at 30 seconds on a (picked for best drain) Vapcell 18350 1100mAh: 1920 (djozz- ) lumen. Current = 10A. So at max with full battery the system efficiency is ~50 lm/W which is ok for a high CRI light.

For comparison two other direct drive E2L shorties at 30 seconds:

Lumileds Luxeon V, everything beefed up : 12.5A, 2800 lumen
Nichia 219B V1 4000K R9080, no spring bypasses because the 219B does not like high current: 5.6A, 920 lumen.

I can not find my E2L with 219C 4000K 90CRI R9050 leds, which should be the most comparable led

The beam=good.
Compared the XP-L Hi that is often used in the 10570, the LH351D makes a wide fairly pretty round beam, no squares around the hotspot, much better despite the similar sized die. As I already noticed in my LH351D reflector light, Samsung made this led with good optical properties.

The tint=good.
Unlike the Nichia 219B V1 R9080 which has consistent tint at all currents, this LH351D starts slightly greenish at low currents (nothing ugly though), at higher current the reds join in and the tint is at its best, without the overly rosy tint of the Nichia.
Tip: do not use the stock AR-coated lens of the E2L, it kills the tint, use a common non-coated lens, like from a S2+.

Agro · 2018-04-15T06:02:21.000Z

I’ve been wondering about that for a long time.
What is a tint change introduced by AR coating?

It reflects some frequencies better than others, but these are marginal amounts and shouldn’t be visible, right?
If it absorbs some frequencies, these are marginal amounts and shouldn’t be visible, right?
Is that changing frequency of the passing photons? That doesn’t sound right…
Is there any other effect at play?

AEDe · 2018-04-15T06:23:39.000Z

Agro:

I’ve been wondering about that for a long time.
What is a tint change introduced by AR coating?

It reflects some frequencies better than others, but these are marginal amounts and shouldn’t be visible, right?
If it absorbs some frequencies, these are marginal amounts and shouldn’t be visible, right?
Is that changing frequency of the passing photons? That doesn’t sound right…
Is there any other effect at play?

Effect of AR coating depends on angle. It works appropriate way only
at small angles of deviation from the normal. So is it good for throw only.

CRX · 2018-04-15T07:54:33.000Z

Nice info guys :+1:

mrheosuper · 2018-04-15T08:08:25.000Z

how the AR coating affect CRI and R9 value ?, is it really bad or not noticeable

AEDe · 2018-04-15T09:13:56.000Z

mrheosuper:

how the AR coating affect CRI and R9 value ?, is it really bad or not noticeable

In hotspot affect is small.
For large angle effect may be complicated. For example increasing CCT, CRI ,R9 simultaneously.

AEDe · 2018-04-16T13:00:46.000Z

Package with 351D was received

But 351B will come next week.

Information for people in the list.

My email connected with PP is andreyderbishev@yandex.ru .

Important.
I ask those who live in the EU to pay in euro and people from other countries to pay in usd.
To find out the exchange rate euro/usd you can visit ECB site
While sending by PP please use “To friends and family” (Commision fee is obout 5%)

I remind you 351D 1.6$/pcs for <20pcs.

1.5$ for >20pcs. Post is 5$.

After payment please write your name and address.

I also will send this information via PM.

ImA4Wheelr · 2018-04-16T15:43:17.000Z

^

PP sent. Thanks for arranging this.

gisewhcs · 2018-04-16T19:08:37.000Z

PP sent, shipping info PMed.

AEDe · 2018-04-16T19:46:56.000Z

I also would like to remind about sending via “to friends…”. In this way you pay PP fee. In the other way you should add 5%+0.2$/€
Sorry for strange mathematics now I understand that it is not convenient. I never used PP before for GB.

Barkuti · 2018-04-16T20:50:31.000Z

Well, glad to see this moving along.

Net total for me: (16 × 1.6)_LH351D + (14 × 0.5)_LH351B + (3 × 1)_XP-G3 + shipping = $40.60 ≈ €32.82 with current ECB rate, is this right?

With regards to the PayPal rates if this path is taken, the seller rate as I see it is 3.4% + 0.35€. I guess you say “add 5%” to slightly overshoot because from the buyer's side the actual fee would be a tiny bit above 4%, doesn't it? Just for learning. :-)

Cheers ^:)

Lightbringer · 2018-04-16T20:58:53.000Z

AEDe:

I also would like to remind about sending via “to friends…”. In this way you pay PP fee. In the other way you should add 5%+0.2$/€

Sorry for strange mathematics now I understand that it is not convenient. I never used PP before for GB.

Perfect timing… I was gonna ask if I could do it that way by tossing in an extra 5%.

I heard that PP kinda has fits about people “misusing” f&f, kinda like buying something offa Ebay “off-channel”.

I’m still a PP n00b, only did like 3 transactions aside from Gearbest and the like, where they pretty much fill in all the blanks and you just click “yeah, do it”.

Lightbringer · 2018-04-16T21:09:51.000Z

Barkuti:

wak, wak, wak…

Wow, I go to buy LEDs and I get Maxwell’s equations…

Anyone wanna do the math for me? :weary:

(25×1.50)_LED + (5.00)_postage = 37.50+5.00 = 42.50_subtotal

So whut’s the damage for PP fees? 3.5% + something?

45bux-even cover it?

gisewhcs · 2018-04-16T21:14:47.000Z

I had to pay ~17€, rounded up to 18€ and my PP asked 18,09€. Don’t get that equation too…

But how do you make that lower characters in your equations?