Luminus SST-40, a N4 BA bin tested

The lower Vf of the SST-40 should mean it is more efficient than the XPL. These emitters produce roughly the same amount of light at a given current, so the ratio of the Vfs at a given current will give the relative efficiency. The SST-40 is about 15% more efficient meaning it converts more of the input power to light rather than heat.

So at a given current the light output is the same, and the input power and heat production is less for the SST-40. At a given wattage the SST-40 produces more light (more current), and produces less heat.

Thanks EasyB.

So real-world example. I was running 4P XHP35 through a FET on 4S 18650. It was really bright, but the host couldnā€™t handle the heat. Iā€™m guessing these would get me around 2,000 lumens less, but possibly similar lux and less heat? (in 4S instead of 4P, obviously)

I want to order a couple, Is Kaidomain selling real ones? Thanks!

I have five from Kaidomain, they are real!

Sounds about right. Though these will pull a lot of current so it will still be a lot of heat. But unless you use a good buck or boost driver you wonā€™t see the efficiency gain over XPL V6. I think the real advantage of these over the XPL V6 is their ability to be driven harder in a direct drive situation.

Thanks tm07, ordered some! :beer:

WhT host are you using?

thank you djozz for taking the time and effort for doing this tests, you are a wiki to me plz dont stop

Thank you 1000 times

We have something in common gamezawy. :slight_smile:

I got my SST-40s that I ordered from Shenzhen Great Technology on AE. All three appear to be the real deal. I also got one from Kaidomain and it is also a real SST-40.

There are some slight imperfections though. The one from KD and one of the Aliexpress ones are slightly raised. Probably not enough to be a concern since there is still solder under the center of the emitter. I will probably try to get the Ali one seated correctly since I plan on driving that one harder than the others. The DTP copper feels soo much nicer compared to the thin aluminum boards the others are on.

Dave G is this the seller you bought your leds from him ? Store:Shenzhen Great Technology Co.,Ltd.

About heat:
I tested in a convoy C8 host samsung 25R battery, 10x7135 3500ma driver and with xpl HI the light got 60Ā°C after 15 minutes.
Same everything with SST40 I got 61Ā°C.
The XPL HI output with full battery is 1056 lumens and the SST40 I measured 1122 lumens.

@ gamezawy - Yes that is the seller I bought from.

I measured 8,2A and 1938 lumens with TA17 driver in Convoy C8

Im really liking the tint on this SST40 from both Shenzhen Great Technology and Kaidomain. Im not really a fan of colder tints but these turned out surprisingly nice. It has a pinkish white tint compared to the blueish Cree (cool white) emitters.

I have them DDā€™ed in a Convoy C8 and it is performing really well. Very happy with them.

Nice!

I tried to get my first sst40 mod working last night but those mcpcbā€™s from kaidomain were too thin. Have to make a spacer to get them to fitā€¦

Iā€™ve experienced the same. Very nice uniform beam and tint. Itā€™s not nice as in pure white. It definitely has a tint but as was said this tint is a pale purpley tint. Hard to describe as itā€™s not the normal led tint we are used to.

Has anyone thought about sticking dedomed SST-40s under carclo 10 mm optics? For example with Emisar D4.
Thereā€™s no PCB for it, but since die size is similar to the XP-L, it should be floody, but not all flood. And significantly brighter than XP-L HIā€¦

It wont be much brighter when de-domed. Hard to notice by eye and only at super high currents for a few seconds (20+A with three LEDs).