Cree XM-L Bin Advise & Charger advise

[ljw2k]

Hi all i need some Cree XM-L Bin Advise on which would be best in a Mag 2D and would both be the same brightness just different tints if so where could i see beamshots or further information in regards.

Cree XM-L T6 premium 1D tint emitter
* 3V typical driving voltage
* 280 lumen at 700mA
* Up to 975 lumens at 3A

OR

Cree XLamp® XM-L LED - U2


Also looking for a good lipo IMR charger for 32600's and IMR 26650's and am i right in saying the PILA charger is a good one and stops charging once it reaches it's peak 4.2 v

 

[hellokitty[hk]]

Re: Cree XM-L Bin Advise

They're not the same brightness; U2 should be slightly brighter at a given drive current. You don't mention what tint the U2 is.

 

[ljw2k]

Re: Cree XM-L Bin Advise

I don't see a tint description in the item spec sheet unless " Cool White " is the tint ?.............> http://www.lck-led.com/p865/Cree-XL...mm-Board-U2-Group,1000Lm@3A/product_info.html

 

[Al Combs]

I think it's interesting the same web site lists a T6 binned XM-L as having a 1A color tint, but doesn't specify a tint for their U2 bin. I couldn't find the T6-1D. Anyway, maybe the absence of a tint for the U2 wasn't an oversight. Cutter is selling XM-L U2's and is currently only available from them in a 2S tint. I'm guessing if it was available in more than one color at the moment, Cutter would at least list it.

Have you seen the DFiorentino Bin Coding thread? Click on the first picture that says, "ANSI White (Including Cree subdivisions)". The tint 2S is well into what you have to call the cat-pee green stage.:sick2: The T6 your site is selling has a 1A tint and is perfectly neutral for that color temperature. It's a bit on the cool side, but right on the BBL line. That is to say perfectly neutral color. You might be better off with an LED that is slightly dimmer but at least is not an ugly color green.

I have been charging IMR 26650's in my Pila IBC with no problems. I'm not sure if a 32 mm battery would fit. But you could always use a wooden dowel with wires and magnets if it didn't.

 

[ljw2k]

Excellent info mate appreciate it so i take it the T6-1D tint is the best out of all the tints even though it is not the brightest.

 

[flashflood]

The tint 2S is well into what you have to call the cat-pee green stage.

Thank you for that. Actually made an involuntary and slightly alarming cackling noise when I read that.

 

[Justin Case]

Excellent info mate appreciate it so i take it the T6-1D tint is the best out of all the tints even though it is not the brightest.

Best tint is in the eye of the beholder. I've been using XM-L T5 flux bin neutral tints (4A, 4B, 4C, 4D).

The lumens difference IMO is negligible and useful mainly for bragging rights. T5 is a min of 260 lumens at 700mA. T6 is 280 lumens min. U2 is 300 lumens min. If you look at the Cree XM-L datasheet graph of relative luminous flux vs forward current, at 3A drive, RLF is ~325%. Thus, the max lumens difference from T5 to U2 is going to be about 40 lumens * 3.25 = 130 lumens, i.e., 845 emitter lumens for the T5 vs 975 for the U2. Thus at 3A drive, a U2 has about 15% more lumens output than a T5.

 

[ljw2k]

Thanks for your email, the tint of the current stock of XM-L LED U2 is 1C , this is the reply i just got from the store.

 

[beekeeper5]

Will your eyes even notice the brightness between T6 and U2?

 

[Al Combs]

Will your eyes even notice the brightness between T6 and U2?

The mean luminous flux increase from T6 to U2 is slightly under 7% or 20 lumens. It could be as much as 14.3% or as little as 0%. The only way you would notice that small of a difference is with a light meter. Your eyes are much more sensitive to variations in color than intensity.

 

[Changchung]

Hi guys, excume for the offtopic but I think you can help me, I am waiting for a 18650 based flashlight to make it a mod, I want to put in there a XM-L Led and drive it with 2.8 amp but I am concerned in that it can generate a lot of heat, my question is, with which Led can I get more lumen drive it with 1.4 amp? A XM-L or a XP-G? Thanks for the help...

 

[ljw2k]

You might get a better response if you go and start your own thread mate no disrespect.

 

[easilyled]

I have seen mods specifying the use of U2s in 1C tint.
I do not know the source of these, just that they are evidently obtainable.

 

[Al Combs]

If lumen output is the only concern, definitely go with the XM-L. According to the Cree data sheet and the B&L doc's, An XP-G R5 @ 1.4 amps has an output range of 442-470 lumens and draws 4.9 watts. The XM-L T6 @ 1.4 amps has an output range of 515-552 lumens and draws 4.3 watts. That is of course just an extrapolation and a YMMV type of thing. The one thing those numbers don't suggest is the XM-L has twice the surface area of the XP-G. To get more throw, an XM-L requires a larger reflector. Or if your 18650 host has an MOP reflector, the XM-L might win on sheer output.

 

[Changchung]

You might get a better response if you go and start your own thread mate no disrespect.

Sorry... 🙁

If lumen output is the only concern, definitely go with the XM-L. According to the Cree data sheet and the B&L doc's, An XP-G R5 @ 1.4 amps has an output range of 442-470 lumens and draws 4.9 watts. The XM-L T6 @ 1.4 amps has an output range of 515-552 lumens and draws 4.3 watts. That is of course just an extrapolation and a YMMV type of thing. The one thing those numbers don't suggest is the XM-L has twice the surface area of the XP-G. To get more throw, an XM-L requires a larger reflector. Or if your 18650 host has an MOP reflector, the XM-L might win on sheer output.

Thanks for your help...