I'm seeing these new LED pop up in a few lights but there doesn't seem to be much information about them yet. Apparently they're made in China but I don't know any more than that. I haven't got my hands on any yet.
This is what I've found out with a bit of Googling.
LED
Footprint
Approx Lumens
SFN55.2
7070
7800 lm
SFN60
7070
8000 lm
SFQ55
5050
3000 lm
SFQ60
5050
3000 lm
SFS80
3535
1850 lm
N=7070, Q=5050, S=3535
Here's a table from Nightwatch. Thanks to helicoil for sharing. I've edited in the translations. I'm not sure what luminous flux density is measured in as numbers look off for cd/mm^2/
Thank you for the summary, Dave. I have already asked my contacts at Sofirn to find the datasheets for these LEDs. They are highly interested at least in testing SFN55.2. If anyone can help me finding out more about the manufacturer and the corresponding datasheets it would be great.
My first reaction would be to disregard these, they are made by a company we are not really familiar with, there is not much data out there about them and we do not know what production quality is like. But… I would have said the same about the GT-FC40 and it is a fantastic LED. So, maybe we will find out more. The 3535 does not look like it will throw like the XP-L Hi as it appears to me to have a larger square emitting surface. But, I am sure they will be found and tested here.
I’m looking forward to seeing data on these start trickling in. Do we know what voltage the SFN60 runs at, and whether or not it has a dome? If it’s a flat 6-12V emitter I could see it catching on in single-LED throwers as an option that’s (potentially) cheaper than an SBT90.2 but more intense than an XHP70.2, which I’d imagine lots of people (including myself) would buy.
Maybe someone with contacts to Mateminco (Freeme?) could ask for datasheets. I know Lexel once used to be in close contact with Mateminco but he has been offline for 9 months now. I try to ask helicoil (Martin) on TLF for he is very active on the Chinese flashlight forum Baidu and frequently posts news about these new emitters. Sofirn said these LEDs were maybe customized for certain manufacturers. That could leave room to hope for warmer tints (4000K - 5700K) if specifically requested. Usually, these LEDs come in 6500-7000K coldwhite tint. If I am not mistaken Simon Mao is in close contact to Getian who are willing to offer any desired CCT on request, e.g. for the FC40 LED.
Getian is hesitant about different voltage configurations though over cost concerns with complex bond wire layouts.
I’m particularly interested in 5050 footprint emitters in 3V and 4500-5500K ~80CRI (Rg > 98 , R9 > 5 , Duv < 0) for high output. A Getian competing HiCRI variant would be nice as well.
As far as I have seen, those new China-LEDs are two steps back in terms of efficiency.
Sub 100Lm/W in times where even High Power LEDs are usually over 150Lm/W is not the right way
How do you know that? Have you tested it? I understand why the SFN55.2 might not be efficient with it’s very low vf. Combine that with a linear driver and yh it’s not gonna be great. At turbo it seems pretty similar to 7x osram 2mm. Pulls about the same current with similar output.
I tested the SFN55.2 in a NI03 and got near makes no difference 29 amps at probably 3.3-3.5 volts (6912 conservative Lumens) with the included 26800 battery. I’m thinking of trying a 30T to see if I can get more since I know that 26800 is really working hard at that drive current. Until someone officially tests one in a sphere to prove it, I’ll put my money on the table that the SFN55.2 will be as bright (or brighter) than a 70.2 with less power consumption. Take off the dome and it will be even less output.
For some reason, the luminous area values in that chart seem to be way off for at least some of the emitters.
SFT70 = 6.25 mm²
XHP35HI = 5.8 mm²
SFS80 = 5.2 mm²
Interestingly, the lm/mm² values seem mostly in line with values in my tables. Two wrongs make a right?
