Rolz
(Rolz)
September 4, 2015, 7:59am
86
Just noticed that Kaidomain has some new XPL HI Stars.
Cree XP-L HI U4 7A2 3000K-3500K LED Emitters with 20mm x 1.6mm Copper Base
http://www.kaidomain.com/product/details.S024424
Cree XP-L HI U4 7A2 3000K-3500K LED Emitters with 16mm x 1mm Copper Base
http://www.kaidomain.com/product/details.S024423
marcl
(marcl)
September 4, 2015, 11:24am
87
Could you tell what the point of a u4 bin is? Surely that’s a step back from the xml2.
Marc.
hank
(hank)
September 4, 2015, 4:51pm
88
> what the point of a u4 bin is?
That wouldn’t be the main target of the production run.
Binning takes the output of the run and sorts them by color and efficiency.
The odd bins collect the emitters that came out a bit off the target; they get sold cheap by discounters to people willing to buy small lots or single items.
https://www.google.com/search?q=led+binning
During production, LEDs will vary in colour, flux and forward voltage and this is also true for products from the same batch. The differences are significant and therefore LEDs are measured and delivered to the market in subclasses or groups called bins and this process of segregating LEDs is called binning. So a particular bin may contain LEDs, which emit light within a range of wavelength, range of flux values and also the range of forward voltage that can be applied safely to the LEDs….
… In the case of a high quality LED luminaire product, proper binning will ensure all the LEDs used have no visible differences in flux (brightness) or colour. However, in case of a failure it has to be ensured that the new or replacement LED has to come from the same bin as the LED which has failed.
marcl
(marcl)
September 5, 2015, 6:37am
89
hank:
> what the point of a u4 bin is?
That wouldn’t be the main target of the production run.
Binning takes the output of the run and sorts them by color and efficiency.
The odd bins collect the emitters that came out a bit off the target; they get sold cheap by discounters to people willing to buy small lots or single items.
led binning - Google Search
During production, LEDs will vary in colour, flux and forward voltage and this is also true for products from the same batch. The differences are significant and therefore LEDs are measured and delivered to the market in subclasses or groups called bins and this process of segregating LEDs is called binning. So a particular bin may contain LEDs, which emit light within a range of wavelength, range of flux values and also the range of forward voltage that can be applied safely to the LEDs….
… In the case of a high quality LED luminaire product, proper binning will ensure all the LEDs used have no visible differences in flux (brightness) or colour. However, in case of a failure it has to be ensured that the new or replacement LED has to come from the same bin as the LED which has failed.
Lighting Academy | Philips lighting
But the u4 bin is not as bright as an xml2 u2?
Marc.
Blinky1
(Blinky1)
September 5, 2015, 10:34am
90
U4 is brighter than U2… but they are not as bright as the V-bins.
marcl
(marcl)
September 5, 2015, 11:46am
91
I’m seeing 869 lumens for the XPL U4 VS 1119 lumens for the XML2 U2.
I don’t see the point in the XPL at this bin.
Please tell me if I am missing something as I have no experience with the XPL.
Marc
Blinky1
(Blinky1)
September 5, 2015, 11:02pm
92
marcl:
I’m seeing 869 lumens for the XPL U4 VS 1119 lumens for the XML2 U2.
I don’t see the point in the XPL at this bin.
Please tell me if I am missing something as I have no experience with the XPL.
Marc
Hmm… seems that I was wrong. I assumed, that the XPL and XML2 bins would be equal, since the die size is the same. They are not.
at 3A, XPL U4 should give 869-920 lumens, and XML2 U2 1119-1193.
XM-L2 U2 is comparable to XP-L V4 or V5 in brightness.
pilotdog68
(pilotdog68)
September 5, 2015, 11:39pm
93
But you aren’t going to find a 7A tint XP-L HI in a “V” bin anytime soon.
The warmer tints typically produce less lumens, and the HI produces less lumens.
U4 isn’t a bad bin all things considered.
Tom_E
(Tom E)
September 5, 2015, 11:58pm
94
Compare the 7A tints: XP-L HI to XM-L2 - that's more equivalent. I think the XM-L2 7A's were like T2 or T3 - way lower than U2's. There are 7B3's now though in a T4 bin.
Rolz
(Rolz)
September 10, 2015, 10:55am
95
They’ve just added the Cree XP-L HI V3 1C 6500K LED Emitter to their list for $5.79
http://www.kaidomain.com/product/details.S024438
Also listed is a clearance sale of older SSC torches for $10. For some it may be a good value host for modding.
http://www.kaidomain.com/category.128
mattlward
(mattlward)
September 10, 2015, 12:01pm
96
Do you know a way to filter that site for things in a category that are on sale?
ohaya
(ohaya)
September 10, 2015, 12:46pm
97
Hi,
Thanks! I picked up a couple of the $10 lights :)…
BanL
(BanL)
September 10, 2015, 1:37pm
98
We are doing some clearance for our warehouse.
Those SSC LED flashlights are great for using or modding.
See which is interested to you.
Thanks
Rolz
(Rolz)
September 10, 2015, 7:58pm
99
Sorry I’ve not worked it out. I tend to look through many pages to find interesting products as the search is limited. Fortunately some sales live the SSC are listed on the main page.
BanL
(BanL)
September 13, 2015, 4:33pm
100
New UltraFire UF-T80 Cree XHP50 Flashlight
(http://www.kaidomain.com/product/details.S024453 )
- Stepless Adjusted (1–100) and Strobe mode
Only $47.84
FlashPilot
(FlashPilot)
September 13, 2015, 4:55pm
101
This one’s interesting. The cells are 3P, so a boost driver must have been used.
keithd
(keithd)
September 13, 2015, 6:34pm
102
2500 lumens seems like a reasonably conservative turbo rating, the XHP50’s certainly capable of higher. Dunno about the driver.
M4D_M4X
(M4D M4X)
September 13, 2015, 6:53pm
103
i asked “someone” if he can get it
presterjohn
(presterjohn)
September 13, 2015, 8:18pm
104
The KD HAIII BUCKLE V6 in red that I bought from KD was a real treat. A great little light for just over £3.00. I think I have an urge to get another one probably blue this time.
FlashPilot
(FlashPilot)
September 13, 2015, 8:30pm
105
I mentioned the boost driver becasue the forward voltage of the emitter is far above the input voltage and the cells are in parallel. By comparison, this is very unusual for nearly all cheap flashlights, which are either buck or linear regulated.
Cree shows 1606 lumens at 2 amps for a J bin XHP50. With reflector losses, etc… that would be knocked down to 1285 lumens, which is probably far more likely with the grossly exaggerated chinese lumens we have all come to expect.