change sst40 to sst20 in S2+ and add TIR optics?

LamontGrady · 2019-10-08T16:59:26.000Z

I ordered some S2+ with SST40 and would like to change one to SSt20. Aside from this LED, (16mm right?) what “gasket” do I need?
https://www.aliexpress.com/item/32975568763.html?spm=a2g0s.9042311.0.0.60864c4dCTEitj

7mm hole? 9mm hole? round or butterfly shape?
https://convoy.aliexpress.com/store/group/Gasket-Lanyard/330416_512723652.html?spm=2114.12010608.0.0.66b67394S8jPq4

Also, do these TIR lenses just drop into S2+ for sst20, sst40, 219c, and xml2?
https://www.aliexpress.com/item/1577614278.html?spm=a2g0s.9042311.0.0.60864c4db7WY0w

ggf31416 · 2019-10-08T17:29:18.000Z

I’m not sure the smaller SST20 will be happy at 5A.

KevinZA1988 · 2019-10-08T18:05:59.000Z

5A is pushing it. I don’t push my SST-20 LED’s past 4.5A for turbo runs. At 4A you will be safe.

The SST-20 is in the 3535 (3.5 x 3.5 mm class).

Get the TIR optics from Yajiamei. They fit the 3535 LED’s perfectly and give a good beam. I suggest you get the 10, 15 & 20 degree optics.

LED lens Diameter 20mm Bead surface(10 15 20 25 30 38 45 60 85 degrees lens) XPE/XPG lens ,XP-G2 Lens
https://s.click.aliexpress.com/e/eG0qpt1W

No need for a gasket.

LamontGrady · 2019-10-08T18:53:31.000Z

Interesting. Are those optics different than the way more expensive ones I linked to?

KevinZA1988 · 2019-10-08T18:55:22.000Z

I haven’t tried the optics from Convoy, but I know Yajiamei Optics are great and the go-to single LED optic on BLF. I have many of them in modded lights.

LamontGrady · 2019-10-08T18:58:31.000Z

This is where I got the idea. I ordered them asking him to change to sst20 but he didn’t.
Reddit thread SST40 S2+

KevinZA1988 · 2019-10-08T19:02:03.000Z

Why do you want the SST-20 from Convoy?

LamontGrady · 2019-10-08T19:04:48.000Z

Also, I assumed the thermal protection they mentioned would help?

KevinZA1988 · 2019-10-08T19:10:44.000Z

The thermal protection does help a bit, but when the light is below the temperature threshold the LED will get full current on high mode, if the battery voltage/type of battery can supply enough power.

Nooner · 2019-10-08T22:19:12.000Z

FWIW I’ve been using a 5000K sst20 in an S2+ with the newer sst40 driver and have had no issues.

I’m using it as my bicycle light. It stays on high for extended runtimes.

BlueSwordM · 2019-10-08T22:37:00.000Z

5A is about perfect.

What is pushing it is 6A though.

5A is about perfect for some nice brightness and superb throw from a light this size.

Ryzbor · 2019-10-09T06:46:16.000Z

KevinZA1988:

5A is pushing it. I don’t push my SST-20 LED’s past 4.5A for turbo runs. At 4A you will be safe.

The SST-20 is in the 3535 (3.5 x 3.5 mm class).

Get the TIR optics from Yajiamei. They fit the 3535 LED’s perfectly and give a good beam. I suggest you get the 10, 15 & 20 degree optics.

LED lens Diameter 20mm Bead surface(10 15 20 25 30 38 45 60 85 degrees lens) XPE/XPG lens ,XP-G2 Lens
Page Not Found - Aliexpress.com

No need for a gasket.

So this 21mm won’t fit? http://www.leddna.com/30-degree-frosted-21mm-reflector-collimator-led-lens-for-cree-xhp50-xml2-xm-l/

And will a Luxeon V fit under a 3535 size TIR?

KevinZA1988 · 2019-10-09T06:55:40.000Z

I don’t have an S2+ anymore, so I’m not sure if that optic will fit. I know the Yajiamei Optics fit without any modifications. And I can confirm a Luxeon V does not fit under a 3535 optic, it’s 4040. You can use a reaming tool to open the optic a bit but then you need to raise the optic a bit with a shim to make up for the lost height when reaming it, otherwise it’s out of focus. I just reverted back to a reflector for my Luxeon V.

The best results I had WITH 20mm Yajiamei beaded optics were SST-20, XP-L HI, XP-L HD, LH351D (in that order throw to flood). And I have only tested 10, 15, 20 degree 20mm Yajiamei beaded optics.