Luminus SST-40, a N4 BA bin tested

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Sledgestone
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Yeah, that is weird. But as far as I know everyone else who uses nitro thinner gets the green tint shift. Do you boil the liquid? Does yours contain acetone?

What do you mean by tint shift is nearly invisible? Does it still turn slightly green?

giorgoskok
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Just nitro paint thinner , no boiling . No , it’s not getting green …

I don’t know what it contains . Will try to post beamshot soon

luminarium iaculator
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Sledgestone wrote:
Yeah, that is weird. But as far as I know everyone else who uses nitro thinner gets the green tint shift. Do you boil the liquid? Does yours contain acetone?

What do you mean by tint shift is nearly invisible? Does it still turn slightly green?

Wish you show us and explain your procedure little better. Can you Show result of your hot/cold nitro de doming vs toulene ( photo of both de domed emitters).

It seems that you discover something new and good and community will be grateful if you reveal your method. If you can show us photo of your method. I really looking forward to it.

IME when you take the dome to the bare phosphor no matter which method tint shift will happen… I had similar results with hot dedome(2 methods of this hot de doming, there are 90% chance of leaving silicone residue on emitter after that methods and yes that will lead to less tint shift(tint shift still happens) cause there are still some silicone remains sticked to emitter phosphor surface). Solvent methods take all that silicone to the bare phosphor and they maybe even recycle micro particles of phoshor so yes there is probably a chance for even greater tint shift.

So your toulene method takes all the silicone to the bare phosphor but tint shift almost did not happened? Hmm… Well It could be…

My guess that toulene leaves some silicone residues on phosphor. Or how to say it can’t dissolve the part of the silicone that is merged with emitter phosphor surface. And if that happens it is good… Real good… Can you please show us results with photo?

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

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Sledgestone
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I’m about to do that, just haven’t had the time to do it today.. But I don’t have a specific procedure yet as I’ve only done it once with toluene. It could just be a fluke, even though I don’t think so.

And as you said, if it leaves a tiny bit of the silicone over the phosphorus I don’t mind. I happily sacrifice a bit of throw for a tint without green.

Sukoi
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Hey Sledgestone,

do you rinse the dedomed led with something or just leave it to dry?

Sledgestone
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Sukoi wrote:
Hey Sledgestone,

do you rinse the dedomed led with something or just leave it to dry?

Good question! I didn’t clean it at all, just let it dry. After every other dedome I rinsed with isopropyl alcohol and they’ve turned out bad. So I’ve been a little suspicious that this could be part of the green shift.

Even the LEDs that I didn’t dedome but cleaned with isopropyl seem to have worse tint than the ones that I’ve never cleaned.

Lightbringer
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Sledgestone wrote:
Good question! I didn’t clean it at all, just let it dry. After every other dedome I rinsed with isopropyl alcohol and they’ve turned out bad. So I’ve been a little suspicious that this could be part of the green shift.

I was thinking that if you just pull it out of the solvent and let it dry, it’ll still have a microscopically thin coat of silicone once the remaining solvent dries. By rinsing it with IPA, you’re making sure to rinse off everything.

09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

Sledgestone
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Yeah, that could be it. But I’m counting that as a good thing!

Sledgestone
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Sst-40 dedomed in Toluene

Sst-40 dedomed in Nitro thinner

To me it seems like the one done in Toluene has less silicone left on the phosphorus.

Sledgestone
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Hmm.. I swapped the LEDs between the two hosts because I had a better driver in the one that has green tint. Guess what happened? The perfect white sst-40 is now green and the other one now has no green in it..

I don’t understand a thing.. Could it be the driver that causes the tint shift? That’s the only explanation I have now.

One of the driver is a FET only with PWM and that one is the one that don’t have the tint shift.

twisted raven
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LEDs ran on PWM will always display their tint at their maximum current IIRC, because of how the PWM works.. My SST-40 gives me a brilliant cool white with little green at max output, but at lower outputs on a non PWM driver, it gets rather green.

Sledgestone
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Just thinking out loud. I know that Mitko and 18sixfifty uses FET only drivers and coincidentally they are two of the members that have reported that they dedome without tint shift. Could it be that easy?

I wonder what kind of drivers giorgoskok uses?

giorgoskok
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Fet only drivers , but i don’t think that it is important .

Check your hosts , does the one that shows green tint has an AR coated lens ? What has the other ?

Sledgestone
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giorgoskok wrote:
Fet only drivers , but i don’t think that it is important .

Check your hosts , does the one that shows green tint has an AR coated lens ? What has the other ?

No, everything is the same, two identical hosts. Both have AR-lens and to be perfectly sure I tried them without reflector and lens. It made no difference. I’m quite positive that it is because of the FET only.

LightRider
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I’m using triple channel drivers and the tint is purply cool white. Your results are interesting. I’m watching to see what you determine…

ImA4Wheelr
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I wonder if the type of PWM (phase-correct PWM -vs- fast PWM) matters.  I seem to remember CC and TK mentioning it impacted moonlight.  Maybe it impacts higher modes too?

Sledgestone
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LightRider wrote:
I’m using triple channel drivers and the tint is purply cool white. Your results are interesting. I’m watching to see what you determine…

What exactly is a triple channel driver?

I need more drivers to do more extensive testing. If anyone know somebody in Europe who can sell me high quality FET drivers please let me know!

thulfiqar
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impressive LED!
Good Job Djozz Smile

luminarium iaculator
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Sledgestone wrote:
Just thinking out loud. I know that Mitko and 18sixfifty uses FET only drivers and coincidentally they are two of the members that have reported that they dedome without tint shift. Could it be that easy?

I wonder what kind of drivers giorgoskok uses?

Your de doming results does not look to good friend. Lot of silicone residues remaining everywhere.
It seems like your nitro paint thinner and toluene gives absolutely same results

I still recommend that you stick to nitro paint thinner (the cleaning type that you can actually use to wash your hands and even face from paint if necessary) it is not dangerous at all comparing to toluene which is deadly poison Smile

So far your de doming looks like good rookie attempt to proper de doming. Continue with good work and develop your methods Thumbs Up

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

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Mr.Poppy
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Would any one be willing to toluene dedome me one?

Lights: BLF X6v2, Convoy S2+ 4C FET, BLF Q8, Convoy L6 TA Narsil, BLF GT, BLF-348, Convoy S2+ 18350 Nichia 219BT, Astrolux A01, Pelican 2350, BLF D80, BLF A6

Jerommel
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This story gets stranger by the hour..
A driver difference causing such a tint shift?
It’s actually hard to believe..

..waiting for parts..

Still looking for 5” parabolic reflector (for recoil light)

Sledgestone
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luminarium iaculator wrote:
Sledgestone wrote:
Just thinking out loud. I know that Mitko and 18sixfifty uses FET only drivers and coincidentally they are two of the members that have reported that they dedome without tint shift. Could it be that easy?

I wonder what kind of drivers giorgoskok uses?

Your de doming results does not look to good friend. Lot of silicone residues remaining everywhere.
It seems like your nitro paint thinner and toluene gives absolutely same results

I still recommend that you stick to nitro paint thinner (the cleaning type that you can actually use to wash your hands and even face from paint if necessary) it is not dangerous at all comparing to toluene which is deadly poison Smile

So far your de doming looks like good rookie attempt to proper de doming. Continue with good work and develop your methods Thumbs Up

Ehh.. Just so you know, Nitro thinner contains between 60-70% of Toluene. So no one should wash anything with it.

Besides that, I couldn’t care less about the silicone remains around the phosphorus. It doesn’t affect anything.

Edit: and rookie attempt? It’s not exactly rocket science we’re talking about. So if I leave it in for a bit longer that makes me a pro? Good to know!

Sledgestone
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Jerommel wrote:
This story gets stranger by the hour.. A driver difference causing such a tint shift? It’s actually hard to believe..

Tell me about! But it’s the only plausible explanation. I swapped the LEDs again, this time in two other hosts. The results were the same.

Jerommel
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Quote:
Besides that, I couldn’t care less about the silicone remains around the phosphorus. It doesn’t affect anything.

Maybe true, but i’m not happy when there are still bits of silicone on the die either.
If there’s still some on the die, the LED goes back into the hot solvent (not toluene, i’m waiting for that to arrive from Germany, i will use that at room temperature, not around 100°C like i do with car fuel or mixtures)

..waiting for parts..

Still looking for 5” parabolic reflector (for recoil light)

Sledgestone
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Jerommel wrote:
Quote:
Besides that, I couldn’t care less about the silicone remains around the phosphorus. It doesn’t affect anything.

Maybe true, but i’m not happy when there are still bits of silicone on the die either.
If there’s still some on the die, the LED goes back into the hot solvent (not toluene, i’m waiting for that to arrive from Germany, i will use that at room temperature, not around 100°C like i do with car fuel or mixtures)

Sure, I could have left it in longer, but I didn’t want to risk that the die got loose again, so I stopped there. And when the tint came out the way it did I was more than happy!

Firelight2
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Sledgestone wrote:
Jerommel wrote:
This story gets stranger by the hour.. A driver difference causing such a tint shift? It’s actually hard to believe..

Tell me about! But it’s the only plausible explanation. I swapped the LEDs again, this time in two other hosts. The results were the same.


Could also be the lens.

Does one of your lights have an AR-coated lens. I have some Olights whose AR coating would turn any tint green.

Sledgestone
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Firelight2 wrote:
Sledgestone wrote:
Jerommel wrote:
This story gets stranger by the hour.. A driver difference causing such a tint shift? It’s actually hard to believe..

Tell me about! But it’s the only plausible explanation. I swapped the LEDs again, this time in two other hosts. The results were the same.


Could also be the lens.

Does one of your lights have an AR-coated lens. I have some Olights whose AR coating would turn any tint green.

It’s not the lens. They have the same lens and I’ve even swapped them with each other. Still the same result.

KawiBoy1428
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Ordered Sunday 10-1 at my door Tuesday 10-3 now that was FAST! Shocked

And it was packed very well! WinkThumbs Up

KB1428 “Live Life WOT”

Sledgestone
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Great! Looking forward to see your results Thumbs Up

What drivers do you use? If possible could you check with a FET only driver and then with a driver that doesn’t use PWM? It would be interesting to see if anyone else except me and twisted raven gets the same results.

AlexGT
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KawiBoy1428 wrote:
Ordered Sunday 10-1 at my door Tuesday 10-3 now that was FAST! Shocked

And it was packed very well! WinkThumbs Up

!{width:80%}https://s19.postimg.org/ggabm2mj7/IMG_20171003_160437.jpg!

Would love to see the results from the same led tint and bin for a Domed, Hot dedomed, Nitro dedomed, and Toluene dedomed led… Shocked

Or at least just a Domed and Toluene dedomed led comparison same bin and tint…

Thanks!

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