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.
I would really love to see a 6V version of the FC40 as an upgrade path for MTG-02 lights.
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
In this page shows the Nightwatch NSX3E "Extreme edition":
The description (in Chinese), translated, gives these info
NS33FE: 3x SFS80 6500k LED, max 24A current, 6200 lumens, 60kcd (490m)
NS34Mini: 4x SFS80 6500k LED , max 24A current, 6800 lumens, 70kcd (529m)
NS63FE: 3x SFQ60 5500k LED, max 33A current, 10000 lumens, 48kcd (438m)
(comment: SFQ60 LED appears to be in ~5500k color temperature)
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.
10k Lumens from a single Cell light that draws 33A = ~120 Watts which means ~83 Lumens per Watt
That’s at close to max output. I don’t think a dedomed XHP70.2 will be much different.
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.
Nice legwork Dave! I am excited to see more of these high power Chinese emitters in flashlights. Hopefully we can get some data sheets soon.
There’s a new custom red led on kaidomain as well. I’m trying to get Simon to fit it into the Convoy H1
I would also be reticent regarding LED lifespan… until this is verified by a trusted 3rd party.
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?
Thanks! This is great.
From the image, these ones are discontinued or will be soon:
The chart also has some 11mm * 11mm LEDs, like the SBT90.2 but more floody:
We need to find a cell that can handle 62A for the SFH55
3x21700 should do it!
Probably should just use a car battery
LOL.
Im really torn on buying this new FT03 (mateminco version) with the SFN55.2
Can anyone who has a light with one of these LED's share any information? is it interesting / WOWing / fun? I have all three LED variations of the FT03 (one with SFT40 not sst40), any reason i should even be considering the SFN55.2 version?
If so, better to run a Molicel P42a or one of the QB26800 batteries i have laying around? I would need to buy another battery tube though, thats another $10.. thats $60 for an FT03 that does (7000?) lumens. Is that compelling? I don't know.
Well, if the NI03 is any indication of performance to the ft03, I say get it. You won’t be sorry. I don’t think the heat sinking is as good though on the ft03 so your duty cycle on higher modes will be lower. Use the 26800. I really like that cell and it’s probably diminishing returns to use a P42A.
That’d do it!
Other option is LiPo cells, which can often discharge at 100C. With a 5Ah cell that’s 500A!
LiPo has some major cons over LiIon but I don’t see why there aren’t hotrods that use them.
My NI03 Valkyrie with SFN55.2 has arrived in the US.
Tempted by the ft03, but they didn’t offer 26800, and I love nightwatch fins/knurling.
As long as their aren’t weird colors to the beam, I think I’ll like it a lot. I don’t have an SBT90.2 to compare to…