djozz
(djozz)
October 1, 2017, 6:12pm
161
^ Is this the first direct proof that a different dedome method results in different tint? Or is there more than just the dedome method different in the above pictures?
I can’t be 100% sure at this point, but they came from the same reel. In the next two days I’ll try the same thing with another SST-40, XP-L, and XP-G2.
Edit: I’m sure that there’s other members who have found other ways to eliminate the green shit. But I get the feeling that they are very reluctant to share their methods…
Newlumen
(Newlumen)
October 1, 2017, 6:20pm
163
Sledgestone:
I can’t be 100% sure at this point, but they came from the same reel. In the next two days I’ll try the same thing with another SST-40, XP-L, and XP-G2.
Can u test the lumen/lux also? Using the same light with the dedome sst40, xpl, and xpg2?
I have no way to measure lumen, but I’ll measure the candela for sure!
AlexGT
(AlexGT)
October 1, 2017, 7:05pm
165
Sledgestone:
Sirius9:
I also dedomed some of this leds and I am not that happy with results, I used heated liquid method that gives me almost perfect results with XPE, XPG, XML and XPL types of leds but SST-40 is tought cookie. In all cases silicone dome did not separate from phosphor surface so cleaning was required and that never gives “perfectly clean emitter surface” results.
So, I am not happy for now.
Use straight Toulene. Dome comes off in about five minutes in finger warm liquid. Canned air is good to remove silicone leftover. Be careful to heat it though. Tried two times in boiling water and the LED came of with the dome. Also the tint is fantastic!
Left: Sst-40 dedomed in hot nitro thinner.
Right: Sst-40 dedomed in finger warm Toulene.
That dedomed tint looks fantastic Sledgestone!
I wonder if this stuff is the same as what you used… This one claims 99.7% pure Toluene
http://www.ebay.com/itm/Toluene-Toluol-500mL-Reagent-ACS-99-7-Solvent-Paint-Remover-Nail-Polish-/272269129997?epid=729708978&hash=item3f6481390d:g:O8YAAOSwj0NUielh
Jerommel
(Jerommel)
October 1, 2017, 7:16pm
166
Yeah, that’s the stuff.
500ml is a nice amount, USA seller, shipping to NL would be either impossible or very expensive…
Newlumen
(Newlumen)
October 1, 2017, 7:46pm
168
I am very confident sst40 dedome outthrow xpl dedome in both lumen and lux… I need opinions from you. Thanks.
Well the SST-40 will have much more lumen and I think throw should be similar. But the SST-40 will run much hotter at over 8 amps vs the XP-Ls 6 amps.
Jerommel
(Jerommel)
October 1, 2017, 7:58pm
170
Well, whaddayaknow…
€19.48 shipped from DE to NL.
Ordered and payed just now.
Jerommel
(Jerommel)
October 1, 2017, 7:57pm
171
Hey, that’s a fairly good deal too.
New listing? Hadn’t found it previously, or maybe i thought it was too expensive… (?)
Tom_E
(Tom E)
October 1, 2017, 8:39pm
173
Oooh - KB, you beat me to it, but that was a help . I got an unused can of MEK sit'n around. Keep us posted - it's expensive though but interested to see if it works.
I had hoped that you guys would have held out until I’ve had the time to do more testing
Agro
(Agro)
October 1, 2017, 9:08pm
175
Vinh stopped fully removing SST-40 domes, now he shaves them. He says it gives him the same throw, but better output.
Jerommel
(Jerommel)
October 1, 2017, 9:18pm
176
Haha
Your picture of the nitro thinner dedomed SST-40 next to the toluene dedomed SST-40 shows exactly why we should use toluene.
The greenish tint is all to familiar to chemical dedomers, we all want the other result (right one in the picture).
Also, the fact that a tough dome like SST-40 is gone after a short while, and without heating the solvent, is another reason to get pure toluene.
led4power
(led4power)
October 2, 2017, 7:10am
177
Hotspot with toluene dedoming is also visibly larger, which should mean silicone is not completely removed, smaller tint shift also indicates that.
Tangra
(Tangra)
October 2, 2017, 7:52am
178
What driver can I use for this diode to achieve 6V Vf?
This could also be because of different C8 hosts. I couldn’t completely screw the bezel down on the Toluene one. So it might just be different focus.
Edit: I’ll swap the mcpcb in both host and check if it makes a difference on the hotspot.