Gee, a gallon of Toluene for 6½ bucksâŚ
I finally got my 1 Liter in today, 24 bucks shipped from Germany.
Had to fill out a signed end user declaration and a copy of my ID before they sent it.
But i got the >99.5% stuff.
The smell even creeps through the bottle cap⌠:person_facepalming:
2x SST-40.
I bought them to dedome them basically.
One will go in a modded Solarstorm SC01 (8x 7135) 14500 âmini throwerâ.
The other one in an aspheric, probably my B158 on 4.5 Amperes CC FET driver.
I have a bunch of XP-G2 LEDs too, old and new, and a bunch of XM-L2, also some XP-E2.
Good to have the stuff in stock for future plans.
I think iâll put them in a small sealable container, room temperature, shake container gently a couple of times.
Periodically check how it progresses.
I donât think thereâs any need to pay the premium for reagent grade toluene, solvent grade should serve well enough IMO. I guess they want to ensure youâre not making bathtub TNT.
With the low forward voltage, it would seem this should be a great led for regulated multi emitter lights. Its not a lot less watts, but over several emitters it adds up. Less heat, slightly more run time. Sounds good to me.
Hmm, if somebody made a mcpcb for these in a 20mm tripleâŚâŚâŚ With a fet driver could be interesting as well if they push that much easier than xp-g3âs do.
After checking my Ali sst-40s I realized they are b grade, half have bubles in dome and some are not square but wider and centering dics not fit them.
KD is better place to buy, better bin, higher price though.
Well, i bought 2 SST-40 form AliExpress, and i put them in pure tolueneâŚ
The first one got the chip detached from the 5050 base, it seems it wasnât soldered on there properlyâŚ
So it died in the toluene, but i almost managed to reflow the chip back on the 5050 base, but something went wrong, it didnât work anymoreâŚ
Interesting discovery though, because i think you could reflow the chip directly on to copper, and find a way to connect the bond wires to âsomething near byâ, improving the thermal path from chip to whatever copper you want.
But iâm not buying them from AliExpress anymore.
It seems they are factory rejects.
The second survived the ordeal, it is dedomed now.
I will try warm or hot toluene, because there are still some bits of silicone on the phosphor, even after leaving it in toluene for some 36 hoursâŚ
But i was afraid the bonding between chip and phosphor would dissolve, like someone described happening earlier in this (or another) thread.
So i will try solving at higher temperatures with the 2nd SST-40, see if i can get it totally clean.
Meanwhile i have one from KD too.
Iâm sure the chip will not fall of off that one⌠:person_facepalming:
I got 1 half way decent one out of like 30, decent that the bond wires didnât break, but still, silicone remains are hanging off the bond wires. All of the SST-40âs I got came from Kaidomian. I have 20 SST-40 N4 ADâs coming 12 of which are going to replace the XMLâs in my TR-J20, the rest, Iâll try a different approach.
Not if you can see it in the beam. I think 18sixfifty has had some success, from what I gather, he slices and dices before chemical de-dome bath/soak.
The silicone dome has a heck of a hold on them bond wires. :rage: I have also had the chip coming off the pad on a few of them too! :person_facepalming:
Boost itâs pulling 8 amps on a VTC5A, I thought I had something wrong at first, cause it would only pull 6+ amps, until i put a fully charged VTC5 and then a tried a VTC5A . I just swapped out the emitter/board in my M25C2 Turbo that had a FETDDdrv. in it. Itâs a pretty intense BLUE-ISH spot, just kinda fuzzy and dark to one side, like casting a shadow from the silicone clinging on. Meh, I live with it, because I know what will happen! :person_facepalming:
Dales shaves them down to just above the phophorus and heâs getting like 9.4amps or more 2400-2600 lumens, something like that.
Maybe or could be, if they are weak, they might be damaged, I had a few that would light, go thru the levels a couple times and then burn out, some instantly and they still had the dome on, it was released from the base just not completely off, so Iâm left wondering, was it the bond wires or was it the chip to the pad problem? Dunno?